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

Title
Initial cation stoichiometry and current-voltage behavior in Sc-doped calcium copper titanate
Authors
Chung, S.Y.; Lee, S.I.; Choi, J.H.
Keywords
HIGH-DIELECTRIC-CONSTANT, CACU3TI4O12
Issue Date
2006-11
Publisher
AMER INST PHYSICS
Abstract
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.
URI
http://dspace.inha.ac.kr/handle/10505/20094
ISSN
0003-6951
Appears in Collections:
College of Natural Science(자연과학대학) > Physics (물리학) > Journal Papers, Peports(물리학 학술논문, 보고서)
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