新型铁电晶体铌镥酸铅-钛酸铅的生长与性能

doi:10.3724/SP.J.1077.2014.12720

无机材料学报 ›› 2014, Vol. 29 ›› Issue (1): 47-51.DOI: 10.3724/SP.J.1077.2014.12720

新型铁电晶体铌镥酸铅-钛酸铅的生长与性能

刘颖, 龙西法

(中国科学院福建物质结构研究所晶体材料研究室, 福州 350002)

收稿日期:2012-11-30 修回日期:2013-01-31 出版日期:2014-01-20 网络出版日期:2013-12-09
作者简介:刘颖(1986-), 男, 助理研究员. E-mail: liuying@fjirsm.ac.cn
基金资助:
国家自然科学基金(91122020)

Growth and Characterization of a New Lead Lutetium Niobate with Lead Titanate Ferroelectric Crystal

LIU Ying, LONG Xi-Fa

(Key Laboratory of Optoelectric Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China)

Received:2012-11-30 Revised:2013-01-31 Published:2014-01-20 Online:2013-12-09
About author:LIU Ying. E-mail: liuying@fjirsm.ac.cn
Supported by:
National Natural Science Foundation of China (91122020)

摘要/Abstract

摘要： 采用顶部籽晶法生长了一系列不同组分的高居里温度铌镥酸铅-钛酸铅[(1-x)Pb(Lu_1/2Nb_1/2)O₃-xPbTiO₃ (PLN-xPT)]铁电晶体。该晶体在三方相区域表现出典型的介电弛豫特性, 不同组分的晶体表现出了较高的居里温度; 基于介电和结构测试结果, 得到了该体系的低温二元体系相图, 在相图中存在一个准同型相界区域(MPB), 其组分位于x = 0.49~0.51; 利用偏光显微镜分析晶体电畴结构得到和X射线粉末衍射测试结果吻合的相结构; 电学性能测试结果表明不同组分的晶体性能差异较大。组分位于MPB附近的晶体表现出优异的压电性能, 如x = 0.49时, 居里温度T_c= 360℃, 压电常数d₃₃ > 1600 pC/N。处于MPB附近的晶体存在较大的矫顽E_c >10kV/cm, 一些组分晶体的三方–四方相变温度T_RT > 200℃。结果表明高的居里温度及优异的压电性能使二元铌镥酸铅-钛酸铅晶体具有更大的温度应用范围及更广阔的应用前景。

关键词: 弛豫铁电体, 晶体, PLNT, 压电性能

Abstract: A series of new lead lutetium niobate with lead titanate (1-x)Pb(Lu_1/2Nb_1/2)O₃-xPbTiO₃ (PLN-xPT) ferroelectric crystals were grown successfully by the top-seed solution growth technique. Structural analysis and electrical properties measurement showed that the crystals have high Curie temperatures and each composition had different performances. The temperature dependences of permittivity showed typical relaxor behavior in the rhombohedral phase region. Based on the measurement result, a solid state phase diagram in the low temperature range was established, which revealed a morphotropic phase boundary (MPB) in the composition of x = 0.49 to 0.51. Electric domains on (001) surface were observed by the polarizing microscope, in agreement with the X-ray diffraction data. Those compositions within MPB exhibited good piezoelectric properties, such as high coercive field E_c(>10 kV/cm) and high rhombohedral-tetragonal phase transition temperature T_RT (> 200℃). For PLN-0.49PT, it had a high Curie temperature T_c = 360℃ and a piezoelectric coefficient of d₃₃> 1600 pC/N. High Curie temperature and excellent piezoelectric property make this material a promising candidate which can operate in a wider temperature range.

Key words: relaxor ferroelectrics, crystal, PLNT, piezoelectric properties

中图分类号:

TQ174

刘颖, 龙西法. 新型铁电晶体铌镥酸铅-钛酸铅的生长与性能[J]. 无机材料学报, 2014, 29(1): 47-51.

LIU Ying, LONG Xi-Fa. Growth and Characterization of a New Lead Lutetium Niobate with Lead Titanate Ferroelectric Crystal[J]. Journal of Inorganic Materials, 2014, 29(1): 47-51.

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新型铁电晶体铌镥酸铅-钛酸铅的生长与性能

Growth and Characterization of a New Lead Lutetium Niobate with Lead Titanate Ferroelectric Crystal

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