Mg-doped sapphire crystal fibers grown by laser-heated pedestal growth method

Che Ming Liu, Jyh Chen Chen, Chang Hung Chiang, H. U. Long-Jang, Sheuan Perng Lin

研究成果: 雜誌貢獻期刊論文同行評審

4 引文 斯高帕斯(Scopus)

摘要

We grew sapphire crystal fibers doped with various Mg concentrations from 0.5 to 4 mol % by the laser-heated pedestal growth method. It was easy to grow defect-free 0.5 mol % Mg-doped sapphire crystal fibers longer than 50 mm; however, the length of the defect-free region decreased as the amount of MgO doping increased. The growth rates also influenced the quality of the fibers. Microscopic observations of cross sections of the grown fibers revealed that the defects were always concentrated in the central regions of the fibers. Using an electron probe X-ray microanalyzer, we also found Mg in the central regions of the fibers. We discuss the influence of thermocapillary convection and the growth rate on the Mg distribution, and the reason for the formation of defects by constitutional supercooling is described. Using thermomechanical analyzer measurements, we suggest that the strength of the sapphire can be enhanced by MgO doping, which increases Young's modulus

原文???core.languages.en_GB???
頁(從 - 到)194-199
頁數6
期刊Japanese Journal of Applied Physics
45
發行號1 A
DOIs
出版狀態已出版 - 10 1月 2006

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