Tunable current-voltage characteristics in polycrystalline calcium copper titanate

Title
Tunable current-voltage characteristics in polycrystalline calcium copper titanate
Authors
Chung, Sung-Yoon
Keywords
HIGH-DIELECTRIC-CONSTANT, CACU3TI4O12
Issue Date
2007-08
Publisher
American Institute of 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.
URI
http://dspace.inha.ac.kr/handle/10505/1485
Appears in Collections:
College of Engineering(공과대학) > Materials Science & Engineering (신소재공학) > Journal Papers, Reports(신소재공학 논문, 보고서)
Files in This Item:
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