Mixed conduction and grain boundary effect in lithium niobate under high pressure

被引：23

作者：

Wang, Qinglin ^{[1
,2
]}

Liu, Cailong ^{[1
]}

Gao, Yang ^{[1
,3
]}

Ma, Yanzhang ^{[3
]}

Han, Yonghao ^{[1
]}

Gao, Chunxiao ^{[1
]}

机构：

[1] Jilin Univ, Inst Atom & Mol Phys, State Key Lab Superhard Mat, Changchun 130012, Peoples R China

[2] Ctr High Pressure Sci & Technol Adv Res, Changchun 130012, Peoples R China

[3] Texas Tech Univ, Dept Mech Engn, Lubbock, TX 79409 USA

来源：

APPLIED PHYSICS LETTERS | 2015年 / 106卷 / 13期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

TEMPERATURE-COEFFICIENT; OPTICAL-PROPERTIES; RELAXATION; SPECTROSCOPY; IMPEDANCE;

D O I：

10.1063/1.4916828

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The charge transport behavior of lithium niobate has been investigated by in situ impedance measurement up to 40.6 GPa. The Li+ ionic conduction plays a dominant role in the transport process. The relaxation process is described by the Maxwell-Wagner relaxation arising at the interfaces between grains and grain boundaries. The grain boundary microstructure rearranges after the phase transition, which improves the bulk dielectric performance. The theoretical calculations show that the decrease of bulk permittivity with increasing pressure in the Pnma phase is caused by the pressure-induced enhancement of electron localization around O atoms, which limits the polarization of Nb-O electric dipoles. (C) 2015 AIP Publishing LLC.

引用

页数：4

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