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

Qinglin Wang, Cailong Liu, Yang Gao, Yanzhang Ma, Yonghao Han, Chunxiao Gao

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

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.

Original languageEnglish
Article number132902
JournalApplied Physics Letters
Volume106
Issue number13
DOIs
StatePublished - Mar 30 2015

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