Effects of Y Doping on Dielectric and Varistor Properties of CaCu3Ti4O12 Thin Films

Ca 1−3 x /2 Y x Cu 3 Ti 4 O 12 ( x  = 0, 0.05, 0.1, 0.15, and 0.2) (CCTO) thin films were prepared by a modified sol–gel method. The effects of Y doping on the microstructure and electrical properties of the CCTO thin films were investigated. According to x-ray diffraction analysis, the main phase o...

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Bibliographic Details
Published in:Journal of electronic materials 2020-12, Vol.49 (12), p.7379-7385
Main Authors: Man, Hua, Ye, Wenwen, Zhang, Liang, Deng, Yujun, Zhong, Sujuan, Du, Sanming, Xu, Dong
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Dielectric loss
Dielectric properties
Doping
Electrical properties
Electronics and Microelectronics
Frequency stability
Grain size
Instrumentation
Materials Science
Nonlinearity
Optical and Electronic Materials
Permittivity
Porosity
Room temperature
Sol-gel processes
Solid State Physics
Thermal analysis
Thin films
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Summary:Ca 1−3 x /2 Y x Cu 3 Ti 4 O 12 ( x  = 0, 0.05, 0.1, 0.15, and 0.2) (CCTO) thin films were prepared by a modified sol–gel method. The effects of Y doping on the microstructure and electrical properties of the CCTO thin films were investigated. According to x-ray diffraction analysis, the main phase of all Y-doped CCTO thin films is cubic Im 3 ¯ . Meanwhile, some secondary phases were defected. Scanning electron microscopy analysis showed that Y doping can easily lead to a smaller grain size and larger porosity in CCTO thin films. Room-temperature dielectric analysis showed that the dielectric constant of different Y doping samples at 1 kHz was 4213, 4523, 4974, 4824, and 4777, and the dielectric losses were 0.053, 0.051, 0.062, 0.067, and 0.049, respectively. The study of Y-doped CCTO thin films showed that Y doping increased the dielectric constant of the films at low frequencies, but at the same time it increased their dielectric loss and decreased their dielectric frequency and temperature stability range. Y-doping had little effect on the nonlinearity of the films and did not significantly change their nonlinear coefficients.
ISSN:0361-5235
1543-186X
DOI:10.1007/s11664-020-08515-x