| Citation: |
Xu Jun, Zhou Guoqing, Deng Peizhen, Si Jiliang, Qian Xiaobo, Wang Yinzhen, Zhou Shengming, Zhou Yongzong, Zhu Renyuan. Decarbonization and Decolorization of Large Sapphire Crystals Grown by the Temperature Gradient Technique[J]. Journal of Semiconductors, 2006, 27(2): 245-248.
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Xu J, Zhou G Q, Deng P Z, Si J L, Qian X B, Wang Y Z, Zhou S M, Zhou Y Z, Zhu R Y. Decarbonization and Decolorization of Large Sapphire Crystals Grown by the Temperature Gradient Technique[J]. Chin. J. Semicond., 2006, 27(2): 245.
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Decarbonization and Decolorization of Large Sapphire Crystals Grown by the Temperature Gradient Technique
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Abstract
A crystalline sapphire (Al2O3) boule (110×80mm3) grown by the temperature gradient technique (TGT) is a bit colored due to carbon volatilization from the graphite heater at high temperatures and the absorption of transitional metal inclusions in the raw material.The sapphire becomes colorless and transparent after decolorization and decarbonization in successive annealings in air and hydrogen at high temperatures.The quality,optical transmissivity,and homogeneity of the sapphire are remarkably improved.-
Keywords:
- sapphire,
- decolorization,
- decarbonization,
- annealing
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References
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Proportional views
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