Mixed conduction and grain boundary effect in lithium niobate under high pressure
Mixed conduction and grain boundary effect in lithium niobate under high pressure
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高压下铌酸锂的混合传导和晶界效应
DOI：
10.1063/1.4916828
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发表时间：
2015-04
影响因子：
4
通讯作者：
Chunxiao Gao
中科院分区：
文献类型：
--
作者：
Qinglin Wang;Cailong Liu;Yang Gao;Yanzhang Ma;Yonghao Han;Chunxiao Gao
采用40.6 GPa的原位阻抗法研究了铌酸锂的电荷输运行为。Li+离子传导在输运过程中起主导作用。弛豫过程用在晶界界面处产生的麦克斯韦-瓦格纳弛豫来描述。相变后晶界结构重新排列，提高了体介电性能。理论计算表明，Pnma相体介电常数随压力的增加而减小是由于压力诱导的O原子周围电子局域化的增强，这限制了Nb-O电偶极子的极化。
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.
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影响因子：
4
作者：
Hao Aimin;Li Ming;Li Yanchun;Li Hui;Zou Guangtian;Ma Yanzhang;Huang Xiaowei;Yu Cuiling;He Chunyuan;Li Xiaodong;Zhang Dongmei;Liu Bingguo;Liu Jing;Gao Chunxiao
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Gao Chunxiao
影响因子：
3.2
作者：
Liu, JJ;Duan, CG;Hardy, JR
通讯作者：
Hardy, JR
影响因子：
3.2
作者：
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通讯作者：
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影响因子：
3.9
作者：
R. Choubey;P. Sen;P. Sen;R. Bhatt;S. Kar;V. Shukla;K. S. Bartwal
通讯作者：
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影响因子：
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作者：
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通讯作者：
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