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Paraelectric-ferroelectric interface dynamics induced by latent heat transfer and irreversibility of ferroelectric phase transitions

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Chinese Physics B 2006年第6期15卷 1364-1369页

作者：艾树涛 Department of Physics and Institute of Condensed Matter Physics Linyi Normal University Linyi 276005 China

The temperature gradients that arise in the paraelectric-ferroelectric interface dynamics induced by the latent heat transfer are studied from the point of view that a ferroelectric phase transition is a stationary, thermal-electric coupled transport process. The local entropy production is derived for a ferroelectric phase transition system from the Gibbs equation. Three types of regions in the system are described well by using the Onsager relations and the principle of minimum entropy production. The theoretical results coincides with the experimental ones.

关键词： ferroelectric phase transition interface dynamics irreversible thermodynamics

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Binary perovskite solid solutions and trends in their phase transitions temperatures variation

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Journal of Advanced Dielectrics 2022年第1期12卷 36-44页

作者： G.A.Geguzina I.G.Popova A.E.Panich Research Institute of Physics Southern Federal University No.194Stachki Ave.Rostov-on-Don344090Russia Department of Physics Don State Technical University No.1Gagarin sq.Rostov-on-Don344000Russia Institute of High Technology and Piezotechnics Southern Federal University No.10Milchakova str.Rostov-on-Don344090Russia

Some of the known binary ABO_(3)perovskites with ferro-(FE)or antiferroelectric(AFE)at T_(C)and different magnetic phase tran-sitions(PT):ferro-and antiferromagnetic at T_(N)and also some of their solid solutions are *** correlations between their FE or AFE and/or magnetic PTs temperatures,on the one hand,and their interatomic bond A-O strains,on the other hand,have been *** is shown that in the plotted diagrams these temperatures change with a change inδAO values as follows:classical FEs are followed by multiferroics,starting with BiFeO_(3)and ending with YVO_(3),followed by classical *** the same time,the temperatures T_(C)and T_(N)experience maxima at the corresponding points for BiFeO_(3),then quickly decrease,and the difference between them,T_(C)-T_(N),basically also decreases,slightly increasing along the way to the point EuTiO_(3).which made it possible to systematize these T_(C)and T_(N).

关键词： Perovskite structure binary oxides solid solutions ferroelectric phase transition magnetic phase transition phase transition temperature

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ferroelectric PROPERTIES AND phase transitionS OF HOMOGENEOUS KTa1-xNbxO3 CRYSTALS

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Progress in Natural Science:Materials International 1991年第5期 453-458页

作者：王民王继扬刘跃岗魏景谦管庆才 Jinan 250100 PRC State Key Laboratory of Crystal Materials Shandong University

KTa1-xNbxO3(KTN)single crystals with Ta and Nb compositions distributed homogeneouslywere grown with the flux pulling *** relative dielectric constants,dielectric losses,pyroelectriccoefficients and spontaneous polarization of KTN crystals with x=0.32,0.35,0.37 respectively weremeasured within the temperature range of ±150℃.The features of their ferroelectric phase transitionswere also *** results have shown that at the two ferroelectric-ferroelectric phase transition tem-peratures,the dielectric constant and spontaneous polarization of these crystals with the above threecompositions have abrupt variations and regularities like those of *** ferroelectric phasetransition of KTN crystal with x=0.37 approximately belongs to the first order,while the other twoKTN crystals with slightly lower Nb contents appear to have some features of the second orderphase transition.

关键词： KTN crystals ferroelectric phase transition

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