期刊
CERAMICS INTERNATIONAL
卷 33, 期 5, 页码 711-714出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2005.12.007
关键词
grain size; thermal conductivity; YAG ceramics; transparent ceramics; elastic modulus; phonon
We report experimental studies on the physical properties of transparent single and polycrystalline Y3Al5O12 (YAG) used for laser materials or are tubes for lamps. The elastic modulus and thermal conductivity of the YAG polycrystal were measured. The Young's modulus of the YAG polycrystal was 308 GPa at room temperature and decreased to 264 GPa at 1400 degrees C. Thermal conductivity increased with increasing grain size at temperatures below 150 K and was almost independent of grain size at higher temperatures. The thermal conductivity of the YAG polycrystal for a grain size of 7.5 mu m was 1.1 W/cm K at 37 K, about seven times lower than that of the single crystal. (c) 2006 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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