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About: Ferroelectricity
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title="Switch to /sparql endpoint"><i class="bi-box-arrow-up-right"></i> Sparql Endpoint </a> </li> </ul> </div> </div> </nav> <div style="margin-bottom: 60px"></div> <!-- /navbar --> <!-- page-header --> <section> <div class="container-xl"> <div class="row"> <div class="col"> <h1 id="title" class="display-6"><b>About:</b> <a href="http://dbpedia.org/resource/Ferroelectricity">Ferroelectricity</a> </h1> </div> </div> <div class="row"> <div class="col"> <div class="text-muted"> <span class="text-nowrap">An Entity of Type: <a href="http://dbpedia.org/ontology/Building">building</a>, </span> <span class="text-nowrap">from Named Graph: <a href="http://dbpedia.org">http://dbpedia.org</a>, </span> <span class="text-nowrap">within Data Space: <a href="http://dbpedia.org">dbpedia.org</a></span> </div> </div> </div> <div class="row pt-2"> <div class="col-xs-9 col-sm-10"> <p class="lead">Ferroelectricity is a characteristic of certain materials that have a spontaneous electric polarization that can be reversed by the application of an external electric field. All ferroelectrics are also piezoelectric and pyroelectric, with the additional property that their natural electrical polarization is reversible. The term is used in analogy to ferromagnetism, in which a material exhibits a permanent magnetic moment. Ferromagnetism was already known when ferroelectricity was discovered in 1920 in Rochelle salt by Joseph Valasek. Thus, the prefix ferro, meaning iron, was used to describe the property despite the fact that most ferroelectric materials do not contain iron. Materials that are both ferroelectric and ferromagnetic are known as multiferroics.</p> </div> <div class="col-xs-3 col-sm-2"> <a href="#" class="thumbnail"> <img src="http://commons.wikimedia.org/wiki/Special:FilePath/Dielectric_polarisation.svg?width=300" alt="thumbnail" class="img-fluid" /> </a> </div> </div> </div> </section> <!-- page-header --> <!-- property-table --> <section> <div class="container-xl"> <div class="row"> <div class="table-responsive"> <table class="table table-hover table-sm table-light"> <thead> <tr> <th class="col-xs-3 ">Property</th> <th class="col-xs-9 px-3">Value</th> </tr> </thead> <tbody> <tr class="odd"><td class="col-2"><a class="uri" href="http://dbpedia.org/ontology/abstract"><small>dbo:</small>abstract</a> </td><td class="col-10 text-break"><ul> <li style="display:none;"><span class="literal"><span property="dbo:abstract" lang="ca" >La ferroelectricitat és una propietat empírica de materials dielèctrics no , que tenen com a mínim dos estats d'orientació enantiomorfs termodinàmicament estables, que poden ser intercanviats d'un a l'altre per influència d'un camp elèctric extern i l'única diferència és la direcció del vector de polarització. L'efecte físic observable és que el material presenta una polarització després que es retira el camp elèctric. Es pot explicar en funció d'una alimentació residual de dipols permanents. Un exemple és el titanat de bari. Els materials que retenen una polarització neta, un cop retirat el camp, es coneixen com a materials ferroelèctrics.</span><small> (ca)</small></span></li> <li style="display:none;"><span class="literal"><span property="dbo:abstract" lang="de" >Ferroelektrizität (oder auch Polarisationskatastrophe) beschreibt das Phänomen, dass Stoffe mit einem elektrischen Dipolmoment durch das Anlegen eines äußeren elektrischen Feldes die Richtung der spontanen Polarisation ändern. Die Ferroelektrizität wurde früher als Seignette-Elektrizität (selten auch als Seignettesalzelektrizität) bezeichnet, da sie am Seignettesalz (Kaliumnatriumtartrat) entdeckt wurde.</span><small> (de)</small></span></li> <li><span class="literal"><span property="dbo:abstract" lang="en" >Ferroelectricity is a characteristic of certain materials that have a spontaneous electric polarization that can be reversed by the application of an external electric field. All ferroelectrics are also piezoelectric and pyroelectric, with the additional property that their natural electrical polarization is reversible. The term is used in analogy to ferromagnetism, in which a material exhibits a permanent magnetic moment. Ferromagnetism was already known when ferroelectricity was discovered in 1920 in Rochelle salt by Joseph Valasek. Thus, the prefix ferro, meaning iron, was used to describe the property despite the fact that most ferroelectric materials do not contain iron. Materials that are both ferroelectric and ferromagnetic are known as multiferroics.</span><small> (en)</small></span></li> <li style="display:none;"><span class="literal"><span property="dbo:abstract" lang="es" >La ferroelectricidad es una propiedad empírica de materiales dieléctricos no centrosimétricos, que poseen por lo menos dos estados orientacionales enantiomorfos termodinámicamente estables, que pueden ser intercambiados de uno al otro por influencia de un campo eléctrico externo y cuya única diferencia es la dirección del vector de polarización. El efecto físico observable es que el material presenta una polarización incluso después de haber retirado el campo eléctrico. Se puede explicar en función de una alimentación residual de dipolos permanentes. Un ejemplo es el titanato de bario. Los materiales que retienen una polarización neta, una vez retirado el campo, se conocen como materiales ferroeléctricos.</span><small> (es)</small></span></li> <li style="display:none;"><span class="literal"><span property="dbo:abstract" lang="fr" >On appelle ferroélectricité la propriété selon laquelle un matériau possède une polarisation électrique à l'état spontané, polarisation qui peut être renversée par l'application d'un champ électrique extérieur. La signature d'un matériau ferroélectrique est le cycle d'hystérésis de la polarisation en fonction du champ électrique appliqué. Le préfixe ferro- fut emprunté au ferromagnétisme par analogie. L'étude des matériaux ferroélectriques est relativement récente ; il fallut attendre le début des années 1950 et la découverte d'oxydes ferroélectriques simples de structure pérovskite pour pouvoir progresser dans la compréhension de cette propriété. Aujourd'hui, les matériaux ferroélectriques sont très largement exploités en microélectronique en raison de leurs propriétés diélectriques qui peuvent être ajustées avec la composition chimique ou encore la mise en forme du matériau. Ils sont utilisés pour la réalisation de divers composants : filtres, condensateurs etc. On peut expliquer cela simplement en évoquant le décalage des barycentres des charges positives et négatives.</span><small> (fr)</small></span></li> <li style="display:none;"><span class="literal"><span property="dbo:abstract" lang="ga" >Ábhair chriostalta, cosúil le tíotánáit bairiam, BaTiO3, ina bhfuil móimint dhépholach leictreach iomlán, fiú gan réimse seachtreach leictreach a bheith i bhfeidhm orthu, ar féidir iad a chúlú le frithréimse seachtrach leictreach. Sa chás sin, is amhlaidh a tharlaíonn díláithriú idir na hadaimh sa laitís iomlán, ionas nach gcomhthiteann na láir dhearfacha is na láir dhiúltacha luchta a thuilleadh. Ag teocht os cionn luacha ar leith — a bhraitheann ar an ábhar féin, agus a dtugtar teocht Curie uirthi — réabann gluaisne theirmeach ord na laitíse agus cailltear an tréith fhearóileictreach. Tá taighde ar siúl ar scannáin thanaí ábhar fearóileictreach mar shlisní i gcomhair cuimhní ríomhaire.</span><small> (ga)</small></span></li> <li style="display:none;"><span class="literal"><span property="dbo:abstract" lang="in" >Feroelektrik adalah sifat yang memiliki suseptibiltas magnetik yang tinggi di dalarn medan listrik. Sifat ini dimiliki oleh beberapa jenis garam. Komposisi garam-garam tersebut tanpa kandungan besi sama sekali. Jenis garam feroelektrik yang umum digunakan adalah garam Seignet. Garam ini terbagi lagi menjadi dan . Garam-garam tersebut memiliki konstanta dielektrik yang sangat tinggi. Kondisi feroelektrik ini sama dengan feromagnetisme. Bahan feroelektrik juga mempunyai momen dipol listrik spontan dengan arah yang teratur. Polarisasi akan meningkat seiring peningkatan kuat medan listrik. Sebaliknya, polarisasi tidak langsung lenyap ketika medan listrik dihilangkan. Polarisasi hanya lenyap jika diberikan medan Iistrik yang berlawanan arah dengan medan listrik awalnya. Nilai perlawanannya sebesar 103 Volt/cm. Bahan-bahan ferroelektrik juga mengalami fenomena dan piezoelektrik. Dalam bidang teknik, bahan feroelektrik digunakan sebagai .</span><small> (in)</small></span></li> <li style="display:none;"><span class="literal"><span property="dbo:abstract" lang="it" >La ferroelettricità è una proprietà di alcuni materiali solidi che presentano una polarizzazione elettrica in assenza di campo elettrico. Questi materiali vengono polarizzati con l'applicazione di un campo elettrico, e mantengono la polarizzazione anche dopo lo spegnimento del campo stesso. Quando un materiale è polarizzato, al variare del campo esterno si ha un ciclo di isteresi.</span><small> (it)</small></span></li> <li style="display:none;"><span class="literal"><span property="dbo:abstract" lang="ko" >강유전체(強誘電體, ferroelectrics)는 외부의 전기장이 없이도 스스로 분극(자발 분극, Spontaneous polarization, Ps)을 가지는 재료로서 외부 전기장에 의하여 분극의 방향이 바뀔 수(switching) 있는 물질을 뜻한다. 주로 산화물이 많이 응용되고 있으며 BaTiO3가 가장 대표적인 재료이다. 응용 사례로서는 전자회로에 많이 사용되는 MLCC(multilayer ceramic capacitor)를 비롯하여 가스레인지 착화기등의 압전 응용 등 일상 생활에 아주 많이 사용되고 있다. 첨단 응용으로는 강유전체 기억소자(FeRAM) 응용을 위한 박막 연구가 지난 20년 정도 활발히 진행되었으나 최근에는 조금 주춤해진 상태이다. FeRAM은 DRAM의 기억 세포에 강유전체 재료를 넣어서 외부 전원이 없더라도 정보가 사라지지 않는 비휘발성의 특성을 가지며, 강유전체의 자발 분극을 이용하므로 우주선에도 강하다는 장점을 갖는다. 가장 많이 알려진 페로브스카이트 결정 구조 BaTiO3는 상온에서는 정방정(tetragonal) 결정구조를 가지며 양이온 Ti4+가 음이온 O2-의 중심보다 약간 다른 위치에 있어서 자발 분극을 갖게된다. 그런데 약 120oC 이상이 되면 결정구조가 입방정(cubic)으로 바뀌면서 자발 분극이 사라지게 된다. 이렇게 강유전성(ferroelectricity)을 잃어버리는 온도를 퀴리 온도(Curie temperature)라고 한다. 이러한 강유전 상전이는 고체상전이의 예의 하나로 퀴리 온도를 상전이 온도라고도 부른다. 강유전(Ferroelectric)이라는 용어는 강자성(Ferromagnetic)이라는 용어에서부터 나왔다. Ferromagnetic에서 Ferro-는 철을 뜻하는데 강유전성의 많은 현상들이 강자성 현상과 비슷하여 붙여진 이름이다. 그래서 중국이나 싱가포르 등에서는 한국이나 일본에서 사용하는 강유전(強誘電)이라는 용어 대신에 Ferroelectric을 직역하여 철전(鐵電)이라는 용어를 사용한다. 그러나 실제로 강유전체 재료는 철(Fe)이 포함된 재료는 거의 없다. 강유전체는 강자성체와 비슷한 이력곡선(Hysteresis loop) 특성을 보여준다. 외부 전기장(E)에 따른 분극값(P)의 변화를 나타낸 그래프가 이력곡선이다. 상온에서 강유전체이더라도 강유전체는 강유전분역(Ferroelectric domain)으로 나뉘어 있기 때문에 외부 전기장이 없을 경우 분극 값은 영에서 시작한다. 외부 전기장이 강해짐에따라 분극값이 증가하는데 이는 외부 전기장과 같은 방향의 분역이 넓어지기 때문이다. 일정한 전기장 이상이 되면 분극값이 포화되고 외부 전기장에 따른 선형적인 증가만 보여주게 된다. 이 때의 분극값을 포화 분극(Psat, Saturation polarization)이라고 한다. 다시 전기장을 내려주면 분극값이 영으로 돌아가지 않고 외부 전기장이 없더라도 일정한 분극값을 가지게 된다. 이를 잔류 분극(Pr, Remanent polarization)이라고 부른다. 분극값이 영이 되기 위해서는 반대 방향의 전기장을 더 가해주어야 하는데 이 때의 전기장의 크기를 항전기장(EC, Coercive field)라고 부른다. 반대 방향으로 전기장을 더 가해주면 처음에 전기장을 가해 준것과 비슷한 모양으로 분극 값이 포화되고 다시 원래의 방향으로 전기장을 가해주면 포화 분극이 될 때 하나의 폐곡선(loop)을 이루게 된다. 이러한 이력곡선은 강자성체의 이력곡선과 매우 유사하며 강유전체를 나타내는 가장 대표적인 특성이다.</span><small> (ko)</small></span></li> <li style="display:none;"><span class="literal"><span property="dbo:abstract" lang="ja" >強誘電体（きょうゆうでんたい、英: Ferroelectrics）とは誘電体の一種で、外部に電場がなくても電気双極子が整列しており、かつ双極子の方向が電場によって変化できる物質を指す。また、このように電気双極子モーメントが自発的に整列した状態を強誘電状態、この性質を強誘電性と呼ぶ。 代表的な物質としてチタン酸バリウム BaTiO3 やチタン酸ジルコン酸鉛 Pb(Zr,Ti)O3 があり、FeRAM（強誘電体メモリ）などに使用されている。また強誘電体は全て圧電効果を有するため、アクチュエータなどとして使用されるものも多い。</span><small> (ja)</small></span></li> <li style="display:none;"><span class="literal"><span property="dbo:abstract" lang="pl" >Ferroelektryk – dielektryk wykazujący histerezę w zewnętrznym polu elektrycznym. Z powodu występowania spontanicznie spolaryzowanych obszarów (domen) cechuje się bardzo dużą przenikalnością elektryczną.</span><small> (pl)</small></span></li> <li style="display:none;"><span class="literal"><span property="dbo:abstract" lang="ru" >Сегнетоэлектричество — явление возникновения в определённом интервале температур спонтанной поляризации в кристалле, даже в отсутствии внешнего электрического поля, которая может быть переориентирована его приложением. Кристаллы, которым присуще явление сегнетоэлектричества, называются сегнетоэлектриками. Сегнетоэлектрики отличаются от пироэлектриков тем, что при определённой температуре (так называемой диэлектрической точке Кюри) их кристаллическая модификация меняется и спонтанная поляризация пропадает. Кристаллическая модификация, в которой наблюдается спонтанная поляризация, называется полярной фазой, а в которой не наблюдается — неполярной фазой. Явление сегнетоэлектричества аналогично явлению ферромагнетизма и в англоязычной литературе носит название ферроэлектричества (англ. ferroelectricity). Материалы обладающие как сегнетоэлектрическими так и ферромагнитными свойствами известны как мультиферроики. Для феноменологического описания фазовых переходов в сегнетоэлектриках используется теория Ландау.</span><small> (ru)</small></span></li> <li style="display:none;"><span class="literal"><span property="dbo:abstract" lang="pt" >A ferroeletricidade é uma característica de certos materiais que possuem uma polarização elétrica espontânea que pode ser revertida pela aplicação de um campo elétrico externo. Esta propriedade foi descoberta por em 1921 estudando as propriedades dielétricas do sal de Rochelle. O termo Ferroeletricidade foi adotado a partir de 1940 pelo fato de que esses materiais possuírem um ciclo de histerese similar ao ciclo de histerese Ferromagnética.Os materiais que possuem propriedades ferroelétricas são de estrutura cristalina e são dielétricos, ou seja não conduzem corrente elétrica. O que caracteriza os materiais ferroelétricos é que eles possuem polarização espontânea em determinada faixa de temperatura e sua polarização pode ser invertida com a aplicação de um campo elétrico externo.</span><small> (pt)</small></span></li> <li style="display:none;"><span class="literal"><span property="dbo:abstract" lang="uk" >Сегнетоеле́ктрики або фероеле́ктрики — речовини, які мають спонтанний дипольний електричний момент в одній із кристалічних фаз, що існує в певному діапазоні температур.</span><small> (uk)</small></span></li> <li style="display:none;"><span class="literal"><span property="dbo:abstract" lang="zh" >铁电性（英語：Ferroelectricity）是某些材料存在自发的电极化，并在外加电场的作用下可以被反转的特性。该术语被用于类比铁磁性，其中，材料表现出永久磁矩。当铁电性于1920年被Valasek在酒石酸钾钠中发现时，铁磁性就已经被知道。其英文术语的前缀ferro，意思是铁，只是被用来描述属性，事實上大多数铁电材料不含有铁。</span><small> (zh)</small></span></li> </ul></td></tr><tr class="even"><td class="col-2"><a class="uri" href="http://dbpedia.org/ontology/thumbnail"><small>dbo:</small>thumbnail</a> </td><td 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href="http://dbpedia.org/ontology/Building"><small>dbo</small>:Building</a></span></li> <li><span class="literal"><a class="uri" rel="rdf:type" resource="http://dbpedia.org/class/yago/WikicatElectricalPhenomena" href="http://dbpedia.org/class/yago/WikicatElectricalPhenomena"><small>yago</small>:WikicatElectricalPhenomena</a></span></li> </ul></td></tr><tr class="even"><td class="col-2"><a class="uri" href="http://www.w3.org/2000/01/rdf-schema#comment"><small>rdfs:</small>comment</a> </td><td class="col-10 text-break"><ul> <li style="display:none;"><span class="literal"><span property="rdfs:comment" lang="ca" >La ferroelectricitat és una propietat empírica de materials dielèctrics no , que tenen com a mínim dos estats d'orientació enantiomorfs termodinàmicament estables, que poden ser intercanviats d'un a l'altre per influència d'un camp elèctric extern i l'única diferència és la direcció del vector de polarització. L'efecte físic observable és que el material presenta una polarització després que es retira el camp elèctric. Es pot explicar en funció d'una alimentació residual de dipols permanents. Un exemple és el titanat de bari. Els materials que retenen una polarització neta, un cop retirat el camp, es coneixen com a materials ferroelèctrics.</span><small> (ca)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:comment" lang="de" >Ferroelektrizität (oder auch Polarisationskatastrophe) beschreibt das Phänomen, dass Stoffe mit einem elektrischen Dipolmoment durch das Anlegen eines äußeren elektrischen Feldes die Richtung der spontanen Polarisation ändern. Die Ferroelektrizität wurde früher als Seignette-Elektrizität (selten auch als Seignettesalzelektrizität) bezeichnet, da sie am Seignettesalz (Kaliumnatriumtartrat) entdeckt wurde.</span><small> (de)</small></span></li> <li><span class="literal"><span property="rdfs:comment" lang="en" >Ferroelectricity is a characteristic of certain materials that have a spontaneous electric polarization that can be reversed by the application of an external electric field. All ferroelectrics are also piezoelectric and pyroelectric, with the additional property that their natural electrical polarization is reversible. The term is used in analogy to ferromagnetism, in which a material exhibits a permanent magnetic moment. Ferromagnetism was already known when ferroelectricity was discovered in 1920 in Rochelle salt by Joseph Valasek. Thus, the prefix ferro, meaning iron, was used to describe the property despite the fact that most ferroelectric materials do not contain iron. Materials that are both ferroelectric and ferromagnetic are known as multiferroics.</span><small> (en)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:comment" lang="ga" >Ábhair chriostalta, cosúil le tíotánáit bairiam, BaTiO3, ina bhfuil móimint dhépholach leictreach iomlán, fiú gan réimse seachtreach leictreach a bheith i bhfeidhm orthu, ar féidir iad a chúlú le frithréimse seachtrach leictreach. Sa chás sin, is amhlaidh a tharlaíonn díláithriú idir na hadaimh sa laitís iomlán, ionas nach gcomhthiteann na láir dhearfacha is na láir dhiúltacha luchta a thuilleadh. Ag teocht os cionn luacha ar leith — a bhraitheann ar an ábhar féin, agus a dtugtar teocht Curie uirthi — réabann gluaisne theirmeach ord na laitíse agus cailltear an tréith fhearóileictreach. Tá taighde ar siúl ar scannáin thanaí ábhar fearóileictreach mar shlisní i gcomhair cuimhní ríomhaire.</span><small> (ga)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:comment" lang="it" >La ferroelettricità è una proprietà di alcuni materiali solidi che presentano una polarizzazione elettrica in assenza di campo elettrico. Questi materiali vengono polarizzati con l'applicazione di un campo elettrico, e mantengono la polarizzazione anche dopo lo spegnimento del campo stesso. Quando un materiale è polarizzato, al variare del campo esterno si ha un ciclo di isteresi.</span><small> (it)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:comment" lang="ja" >強誘電体（きょうゆうでんたい、英: Ferroelectrics）とは誘電体の一種で、外部に電場がなくても電気双極子が整列しており、かつ双極子の方向が電場によって変化できる物質を指す。また、このように電気双極子モーメントが自発的に整列した状態を強誘電状態、この性質を強誘電性と呼ぶ。 代表的な物質としてチタン酸バリウム BaTiO3 やチタン酸ジルコン酸鉛 Pb(Zr,Ti)O3 があり、FeRAM（強誘電体メモリ）などに使用されている。また強誘電体は全て圧電効果を有するため、アクチュエータなどとして使用されるものも多い。</span><small> (ja)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:comment" lang="pl" >Ferroelektryk – dielektryk wykazujący histerezę w zewnętrznym polu elektrycznym. Z powodu występowania spontanicznie spolaryzowanych obszarów (domen) cechuje się bardzo dużą przenikalnością elektryczną.</span><small> (pl)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:comment" lang="pt" >A ferroeletricidade é uma característica de certos materiais que possuem uma polarização elétrica espontânea que pode ser revertida pela aplicação de um campo elétrico externo. Esta propriedade foi descoberta por em 1921 estudando as propriedades dielétricas do sal de Rochelle. O termo Ferroeletricidade foi adotado a partir de 1940 pelo fato de que esses materiais possuírem um ciclo de histerese similar ao ciclo de histerese Ferromagnética.Os materiais que possuem propriedades ferroelétricas são de estrutura cristalina e são dielétricos, ou seja não conduzem corrente elétrica. O que caracteriza os materiais ferroelétricos é que eles possuem polarização espontânea em determinada faixa de temperatura e sua polarização pode ser invertida com a aplicação de um campo elétrico externo.</span><small> (pt)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:comment" lang="uk" >Сегнетоеле́ктрики або фероеле́ктрики — речовини, які мають спонтанний дипольний електричний момент в одній із кристалічних фаз, що існує в певному діапазоні температур.</span><small> (uk)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:comment" lang="zh" >铁电性（英語：Ferroelectricity）是某些材料存在自发的电极化，并在外加电场的作用下可以被反转的特性。该术语被用于类比铁磁性，其中，材料表现出永久磁矩。当铁电性于1920年被Valasek在酒石酸钾钠中发现时，铁磁性就已经被知道。其英文术语的前缀ferro，意思是铁，只是被用来描述属性，事實上大多数铁电材料不含有铁。</span><small> (zh)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:comment" lang="es" >La ferroelectricidad es una propiedad empírica de materiales dieléctricos no centrosimétricos, que poseen por lo menos dos estados orientacionales enantiomorfos termodinámicamente estables, que pueden ser intercambiados de uno al otro por influencia de un campo eléctrico externo y cuya única diferencia es la dirección del vector de polarización. El efecto físico observable es que el material presenta una polarización incluso después de haber retirado el campo eléctrico. Se puede explicar en función de una alimentación residual de dipolos permanentes. Un ejemplo es el titanato de bario.</span><small> (es)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:comment" lang="in" >Feroelektrik adalah sifat yang memiliki suseptibiltas magnetik yang tinggi di dalarn medan listrik. Sifat ini dimiliki oleh beberapa jenis garam. Komposisi garam-garam tersebut tanpa kandungan besi sama sekali. Jenis garam feroelektrik yang umum digunakan adalah garam Seignet. Garam ini terbagi lagi menjadi dan . Garam-garam tersebut memiliki konstanta dielektrik yang sangat tinggi. Kondisi feroelektrik ini sama dengan feromagnetisme. Bahan feroelektrik juga mempunyai momen dipol listrik spontan dengan arah yang teratur. Polarisasi akan meningkat seiring peningkatan kuat medan listrik. Sebaliknya, polarisasi tidak langsung lenyap ketika medan listrik dihilangkan. Polarisasi hanya lenyap jika diberikan medan Iistrik yang berlawanan arah dengan medan listrik awalnya. Nilai perlawanannya se</span><small> (in)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:comment" lang="fr" >On appelle ferroélectricité la propriété selon laquelle un matériau possède une polarisation électrique à l'état spontané, polarisation qui peut être renversée par l'application d'un champ électrique extérieur. La signature d'un matériau ferroélectrique est le cycle d'hystérésis de la polarisation en fonction du champ électrique appliqué. Le préfixe ferro- fut emprunté au ferromagnétisme par analogie. On peut expliquer cela simplement en évoquant le décalage des barycentres des charges positives et négatives.</span><small> (fr)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:comment" lang="ko" >강유전체(強誘電體, ferroelectrics)는 외부의 전기장이 없이도 스스로 분극(자발 분극, Spontaneous polarization, Ps)을 가지는 재료로서 외부 전기장에 의하여 분극의 방향이 바뀔 수(switching) 있는 물질을 뜻한다. 주로 산화물이 많이 응용되고 있으며 BaTiO3가 가장 대표적인 재료이다. 응용 사례로서는 전자회로에 많이 사용되는 MLCC(multilayer ceramic capacitor)를 비롯하여 가스레인지 착화기등의 압전 응용 등 일상 생활에 아주 많이 사용되고 있다. 첨단 응용으로는 강유전체 기억소자(FeRAM) 응용을 위한 박막 연구가 지난 20년 정도 활발히 진행되었으나 최근에는 조금 주춤해진 상태이다. FeRAM은 DRAM의 기억 세포에 강유전체 재료를 넣어서 외부 전원이 없더라도 정보가 사라지지 않는 비휘발성의 특성을 가지며, 강유전체의 자발 분극을 이용하므로 우주선에도 강하다는 장점을 갖는다.</span><small> (ko)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:comment" lang="ru" >Сегнетоэлектричество — явление возникновения в определённом интервале температур спонтанной поляризации в кристалле, даже в отсутствии внешнего электрического поля, которая может быть переориентирована его приложением. Кристаллы, которым присуще явление сегнетоэлектричества, называются сегнетоэлектриками. Сегнетоэлектрики отличаются от пироэлектриков тем, что при определённой температуре (так называемой диэлектрической точке Кюри) их кристаллическая модификация меняется и спонтанная поляризация пропадает.</span><small> (ru)</small></span></li> </ul></td></tr><tr class="odd"><td class="col-2"><a class="uri" href="http://www.w3.org/2000/01/rdf-schema#label"><small>rdfs:</small>label</a> </td><td class="col-10 text-break"><ul> <li style="display:none;"><span class="literal"><span property="rdfs:label" lang="ca" >Ferroelectricitat</span><small> (ca)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:label" lang="de" >Ferroelektrikum</span><small> (de)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:label" lang="es" >Ferroelectricidad</span><small> (es)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:label" lang="ga" >Fearóileictreachas</span><small> (ga)</small></span></li> <li><span class="literal"><span property="rdfs:label" lang="en" >Ferroelectricity</span><small> (en)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:label" lang="in" >Feroelektrik</span><small> (in)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:label" lang="it" >Ferroelettricità</span><small> (it)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:label" lang="fr" >Ferroélectricité</span><small> (fr)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:label" lang="ko" >강유전체</span><small> (ko)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:label" lang="ja" >強誘電体</span><small> (ja)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:label" lang="pl" >Ferroelektryk</span><small> (pl)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:label" lang="pt" >Ferroeletricidade</span><small> (pt)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:label" lang="ru" >Сегнетоэлектричество</span><small> (ru)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:label" lang="uk" >Сегнетоелектрики</span><small> (uk)</small></span></li> <li style="display:none;"><span class="literal"><span property="rdfs:label" lang="zh" >铁电性</span><small> (zh)</small></span></li> </ul></td></tr><tr class="even"><td class="col-2"><a class="uri" href="http://www.w3.org/2002/07/owl#sameAs"><small>owl:</small>sameAs</a> </td><td class="col-10 text-break"><ul> <li><span class="literal"><a class="uri" rel="owl:sameAs" resource="http://rdf.freebase.com/ns/m.0c5gn" href="http://rdf.freebase.com/ns/m.0c5gn"><small>freebase</small>:Ferroelectricity</a></span></li> <li><span class="literal"><a class="uri" rel="owl:sameAs" 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