Origin of Low-Frequency Dielectric Permittivity In BiFeO3 Multiferroic Ceramics

被引：0

作者：

Tu, C. -S. ^{[1
]}

Wang, T. -H. ^{[1
]}

Schmidt, V. H. ^{[2
]}

Chien, R. R. ^{[2
]}

机构：

[1] Fu Jen Catholic Univ, Grad Inst Appl Sci & Engn, Taipei 242, Taiwan

[2] Montana State Univ, Dept Phys, Bozeman, MT 59717 USA

来源：

2011 INTERNATIONAL SYMPOSIUM ON APPLICATIONS OF FERROELECTRICS (ISAF/PFM) AND 2011 INTERNATIONAL SYMPOSIUM ON PIEZORESPONSE FORCE MICROSCOPY AND NANOSCALE PHENOMENA IN POLAR MATERIALS | 2011年

关键词：

component; BiFeO3; dielectric permittivity; barrier model; magneto-electric coupling; CRYSTAL; POLARIZATION;

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A one-dimensional conductivity barrier model is introduced to describe the dielectric response and conductivity of BiFeO3 (BFO) and (Bi0.95Nd0.05)FeO3 (BFO-5%Nd) ceramics as functions of temperature and frequency. Good qualitative fits of conductivity and dielectric permittivity in the intermediate-temperature region (500-800 K) are obtained with intrinsic barriers of B=8700 K (for BFO) and B=8400 K (for BFO-5%Nd), and extrinsic barriers of Delta=2500 K (for BFO and BFO-5%Nd). The phase-shifted conductivity is responsible for a step-like dielectric relaxation in the region of 500-800 K. The experimental conductivity departs from the conductivity-barrier-model fit below 650 K. This deviation is likely caused by the magneto-electric coupling near the antiferromagnetic-paramagnetic transition. This work suggests that the 5% mole Nd-substitution can stabilize the perovskite structure in BFO ceramic.

引用

页数：4

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