融液構造を考慮したβ-BaB_2O_4単結晶の直接引上育成(<特集>バルク成長)

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タイトル別名
  • Direct Czochralski Growth of β-BaB_2O_4 Single Crystal Considering Melt Structure(<Special Issue>Bulk Crystal Growth)
  • 融液構造を考慮したβ-BaB2O4単結晶の直接引上育成
  • ユウエキ コウゾウ オ コウリョシタ ベータ BaB2O4 タンケッショウ ノ

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説明

BaB_2O_4 composition crystals have two crystal phases, alpha phase (high temperature phase) and beta phase (low temperature phase). They have been grown by the flux method or the flux pulling method, in order to obtain beta phase crystals. Recently, high quality β-BaB_2O_4 (BBO) was successfully grown from a BaB_2O_4 composition melt by D-CZ (direct Czochralski) method without flux elements. That is, metastable phase (beta phase) was crystallized from a BaB2O4 melt in advance of stable phase (alpha phase). Important points of this method are BaB_2O_4 melt structure consideration and growth temperature control. This report discusses the growth mechanism of the D-CZ from the viewpoint of thermodynamics.

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