Mg-Doped Sapphire Crystal Fibers Grown by Laser-Heated Pedestal Growth Method

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概要

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• 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.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2006-01-15

著者

• Hu Long-jang

  Materials And Electro-optics Research Division Chung-shan Institute Of Sciences And Technology

• Chen Jyh-chen

  Department Of Mechanical Engineering National Central University

• Chiang Chang-Hung

  Department of Mechanical Engineering, National Central University, No. 300, Jhongda Rd., Jhongli City, Taoyuan County 32001, Taiwan, R.O.C.

• Chen Jyh-Chen

  Department of Mechanical Engineering, National Central University, No. 300, Jhongda Rd., Jhongli City, Taoyuan County 32001, Taiwan, R.O.C.

• Liu Che-Ming

  Department of Mechanical Engineering, National Central University, No. 300, Jhongda Rd., Jhongli City, Taoyuan County 32001, Taiwan, R.O.C.

• Lin Sheuan-Perng

  Materials and Electro-Optics Research Division, Chung-Shan Institute of Science and Technology, Lung-Tan 325, Taiwan, R.O.C.

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