超高真空中での高純度Nb無転位結晶の育成

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タイトル別名
  • Growth of Dislocation-Free Crystals of High-Purity Niobium in Ultra High Vacuum
  • チョウ コウ シンクウチュウ デ ノ コウ ジュンド Nb ム テンイ ケッシ

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Dislocation-free crystals of high purity are needed for investigation of dynamic properties of dislocations. Kamada et al. succeeded to grow dislocation-free Nb crystals of diameters up to 0.5 mm in a vacuum of about 10−3 Pa. However, crystals with higher purity and larger dimensions are required for the above investigation.<BR>In the present work, the technique of Kamada et al. was improved by employing an apparatus for the crystal growth by the pedestal method operating in an ultra high vacuum of 10−7 Pa which avoided the contamination of growing crystals from surroundings. Using zone-refined and degassed high purity Nb polycrystalline rods as pedestals, crystals with arbitrarily controlled orientations have been grown with this apparatus. According to examinations by means of X-ray topography utilizing the Borrmann effect, dislocation-free Nb crystals of diameters up to 1.1 mm have successfully been grown at speeds of 6.7×10−6-12×10−6 m/s.

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  • 日本金属学会誌

    日本金属学会誌 49 (10), 811-817, 1985

    公益社団法人 日本金属学会

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