Initial cation stoichiometry and current-voltage behavior in Sc-doped calcium copper titanate

被引：24

作者：

Chung, Sung-Yoon ^{[1
]}

Lee, Sirk-Ihl

Choi, Jin-Hoon

Choi, Si-Young

机构：

[1] Inha Univ, Dept Mat Sci & Engn, Inchon 402751, South Korea

[2] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

来源：

APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 19期

基金：

新加坡国家研究基金会;

关键词：

D O I：

10.1063/1.2386922

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

It is demonstrated that either a strong nonlinear or a nearly Ohmic behavior in current-voltage relationship can be distinctively represented in Sc-doped polycrystalline CaCu3Ti4O12, with variation in the initial composition of samples. Through conductive atomic force microscopy and impedance spectroscopy, such a definitive difference in the electrical property was found to depend on the presence of a large electrostatic barrier at the grain boundaries. The effect of Sc ions on the boundary potential barrier and the conductance of single grains is discussed. Findings suggest a different site selectivity of Sc in the lattice in terms of the initial cation stoichiometry.

引用

页数：3

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