Effect of La Doping on the Microstucture and Nonlinear Characteristics of CaCu3Ti4O12  Ceramics

Jing Chen; Tao Li; Hai Yang Dai; Zhen Ping Chen

doi:10.4028/www.scientific.net/DDF.373.241

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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 373Effect of La Doping on the Microstucture and...

Effect of La Doping on the Microstucture and Nonlinear Characteristics of CaCu₃Ti₄O₁₂ Ceramics

Abstract:

Ca_1-xLa_xCu₃Ti₄O₁₂ (x=0-0.05) ceramics are prepared by the solid-state reaction method. The effects of La doping on the microstructure and non-Ohmic properties of Ca_1-xLa_xCu₃Ti₄O₁₂ system are investigated by XRD, SEM and Positron annihilation technique. The results show that no phase transition occurs in the doping range (x=0-0.05), while the significant changes in grain size can be observed as x≥0.02. The positron lifetime results prove that the average lifetime is strongly affected by La doping. The correlation of the nonlinear behavior of CaCu₃Ti₄O₁₂ system and the grain size, the local electron density in defect was discussed.

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Periodical:

Defect and Diffusion Forum (Volume 373)

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241-244

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.373.241

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Online since:

March 2017

Authors:

Jing Chen, Tao Li, Hai Yang Dai, Zhen Ping Chen*

Keywords:

Microstructure, Nonlinear Characteristics, Positron Average Lifetime

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