Electro-caloric effect in relaxor and ferroelectric compositions of Pb(Mg_{(1鈭?span style='font-style: italic'>x)/3}Nb_{2(1鈭?span style='font-style: italic'>x)/3}Zr_x)O₃ ceramics

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• 作者：Gurvinderjit Singh ; ^{gjit@rrcat.gov.in} ; V.S. Tiwari
• 关键词：Electro-caloric ; Relaxor ferroelectric ; Antiferroelectrics ; Polarization
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：15 May, 2012
• 卷：523
• 期：Complete
• 页码：30-35
• 文件大小：1126 K

摘要

Solid solution of relaxor PMN and antiferroelectric PZ, [Pb(Mg_{(1鈭?em>x)/3}Nb_{2(1鈭?em>x)/3}Zr_x)O₃], behaves like ferroelectric with increasing PZ content following a wide composition range of diminishing relaxor properties. Electro-caloric measurements on three relaxor and one ferroelectric composition of this solid solution have been carried out by indirect method. All the compositions give a maximum temperature change of 鈭?.33 K on application of 1 kV/mm electric field. This value is higher than the PLZT or PMN-PT based relaxors. A shift of 鈭?5 掳C in the temperature of electro-caloric maximum was observed with application of electric field, for relaxor compositions, attributed to the field induced effect on the transition temperature. Similar shift for ferroelectric composition is significantly lower (鈭? 掳C).