High-pressure electrical transport properties of KNbO 3: Experimental and theoretical approaches

Qinglin Wang, Yonghao Han, Cailong Liu, Yanzhang Ma, Wanbin Ren, Chunxiao Gao

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Abstract

Pressure-induced electrical transport properties of KNbO 3 including resistance, relaxation frequency, and relative permittivity have been investigated under pressure up to 30.6 GPa by in situ impedance spectroscopy measurement. The results indicate that the discontinuous changes of these physical parameters occur around the structural phase transition pressure. The decrease of activation energy with increasing pressure reveals that the vibration damping of Nb-O dipoles is weakened in the orthorhombic and the tetragonal phases. The density of states and difference charge density calculations show that the pressure-induced charge transfer between the Nb and O atoms causes the relative permittivity change of KNbO 3.

Original languageEnglish
Article number172905
JournalApplied Physics Letters
Volume100
Issue number17
DOIs
StatePublished - Apr 23 2012

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