Phase diagram and incommensurate antiferroelectric structure in (Pb1-1.5xLax)(Zr0.42Sn0.40Ti0.18)O3 ceramics discovered by band-to-band optical transitions

被引：9

作者：

Ding, X. J. ^{[1
]}

Xu, L. P. ^{[1
]}

Hu, Z. G. ^{[1
]}

Chen, X. F. ^{[2
]}

Wang, G. S. ^{[2
]}

Dong, X. L. ^{[2
]}

Chu, J. H. ^{[1
]}

机构：

[1] E China Normal Univ, Minist Educ, Dept Elect Engn, Key Lab Polar Mat & Devices, Shanghai 200241, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Inorgan Funct Mat & Devices, Shanghai 200050, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2014年 / 105卷 / 13期

关键词：

LEAD; DEPENDENCE;

D O I：

10.1063/1.4897357

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Optical properties and phase transitions of (Pb1-1.5xLax)(Zr0.42Sn0.40Ti0.18)O-3 (PLZST 100x/42/40/18) ceramics with different compositions have been investigated by temperature dependent spectroscopic ellipsometry. Two interband critical points (E-cp1 and E-cp2) located at about 3.9 and 5.1 eV can be obtained by fitting standard line shapes to the second derivatives of the complex dielectric functions. Based on the band-to-band transitions, the phase diagram of PLZST ceramics can be well presented. Moreover, a peculiar incommensurate antiferroelectric state has been found to exist above the temperature of the normal commensurate antiferroelectric tetragonal structure. It can be stable below Curie temperature, evolving slowly with decreasing temperature towards the commensurate structure, which is due to strong pinning of incommensurate domain walls. The phenomena can result from a competition between ferroelectric ordering and antiferroelectric ordering caused by the lanthanum modification. (C) 2014 AIP Publishing LLC.

引用

页数：5

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