Tunable current-voltage characteristics in polycrystalline calcium copper titanate

Title
Tunable current-voltage characteristics in polycrystalline calcium copper titanate
Authors
Chung, S.Y.; Choi, J.H.; Choi, J.K.
Keywords
HIGH-DIELECTRIC-CONSTANT, CACU3TI4O12
Issue Date
2007-08
Publisher
AMER INST PHYSICS
Abstract
The nonlinear current-voltage relationship and the subsequent threshold voltage in polycrystalline CaCu3Ti4O12 are found to be easily controlled by simply doping a small amount of supervalent cations, Nb5+ and Ta5+. The authors show that the dopants have a significant effect on the reduction of the electrostatic potential at the grain boundaries, scarcely changing the conductance of the bulk grains. Through microcontact analysis and impedance spectroscopy, the control of the potential barrier at the boundaries was demonstrated to be a key factor for governing the overall current-voltage characteristics. Plausible compensation mechanisms for the excess charge of the added dopants are also discussed.(c) 2007 American Institute of Physics.
URI
http://dspace.inha.ac.kr/handle/10505/5918
ISSN
0003-6951
Appears in Collections:
College of Natural Science(자연과학대학) > Physics (물리학) > Journal Papers, Peports(물리학 학술논문, 보고서)
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