Microscopic interpretation of sign reversal in the electrocaloric effect in a ferroelectric PbMg1/3Nb2/3O3-30PbTiO3 single crystal

被引：33

作者：

Axelsson, A. -K. ^{[1
]}

Le Goupil, F. ^{[1
]}

Dunne, L. J. ^{[1
,2
]}

Manos, G. ^{[3
]}

Valant, M. ^{[4
]}

Alford, N. McN. ^{[1
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7 2AZ, England

[2] London S Bank Univ, Dept Syst Engn, London SE1 0AA, England

[3] UCL, Dept Chem Engn, London WC1E 7JE, England

[4] Univ Nova Gorica, Mat Res Lab, Nova Gorica 5000, Slovenia

来源：

APPLIED PHYSICS LETTERS | 2013年 / 102卷 / 10期

关键词：

D O I：

10.1063/1.4794543

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

With increasing temperature, PbMg1/3Nb2/3O3-30PbTiO(3) (PMN-30PT) crystals change from pseudo-rhombohedral to tetragonal to cubic phases. In addition to the usual positive electrocaloric effect (ECE), a negative ECE, whose origin is uncertain, is observed. Here, these two types of the ECE contributions in PbMg1/3Nb2/3O3-30PbTiO(3) crystals are modelled theoretically using a one dimensional statistical mechanical lattice model, which is solved by an exact matrix method. The quasi one-dimensional model reproduces the trends in the experimental behaviour and attributes the electrocaloric sign reversal to free energy changes induced by the electric field. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4794543]

引用

页数：4

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