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Abstract

Al2O3 ceramics doping with Y3+ and La3+ are synthesized by conventional solid state reaction method. The structures, thermal conductivities properties and the effects of sintering temperature on the electrical properties of the samples are measured. X-ray diffraction results indicate that all the ceramics are formed to be of pure solid solution when the samples are sintered at 1500℃. Thermal conductivities of Al2O3 ceramics reach up to 8.60 W/(m· K). All the ceramics show temperature-stable dielectric characteristics. Typical dielectric relaxation behaviors are observed in Y- and La-doped Al2O3 ceramics, and the relaxation mechanism is also analyzed.

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1.
Funds:Project supported by the National Natural Science Foundation of China (Grant No. 10774030), the Science and Technology Program of Guangdong Province, China (Grant No. 2010B090400141), and the Science and Technology Project of Guangzhou City, China (Grant No. 2010Y1-C221).

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Vol. 61, Issue 20 - 2012-10-20

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