ＬａＢ６，ＣｅＢ６単結晶の育成とその性質

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タイトル別名
  • Growth and Properties of LaB<sub>6</sub> and CeB<sub>6</sub> Single Crystals
  • LaB6 CeB6 タンケッショウ ノ イクセイ ト ソノ セイシツ

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Growth conditions of LaB6 and CeB6 single crystals in molten aluminum in an argon atmosphere have been investigated.<br>The optimum growth conditions to obtain cubical single crystals are summarized as follows: The mixing atomic ratios of raw materials: for LaB6, B/La-5.0 and Al/La=80, and for CeB6, B/Ce=5.0 and Al/Ce=69.<br>The heating temperature and time held at the temperature: 1500°C and 10h for both LaB6 and CeB6.<br>LaB6 of purplish red color and CeB6 of blue color with the metallic luster were grown. The morphologies of grown single crystals are cubic with {100} faces, and needle and thick-plate with well-developed (100) faces.<br>The lattice constants (a0) and densities (D) of single crystals are as follows, <br>LaB6; a0=4.1552±0.0001(Å), D=4.68±0.02g/cm3<br>CeB6; a0=4.1396±0.0001(Å), D=4.69±0.04g/cm3.<br>Values of Knoop-microhardness determined on (100) faces of single crystals are as follows, <br>LaB6; ‹100›: 2180-2550kg/mm2<br>‹110›: 1530-1830kg/mm2<br>CeB6; ‹100›: 1870-2170kg/mm2<br>‹110›: 1540-1780kg/mm2.<br>As-grown cubical single crystals were used for the oxidation in air at temperatures between 700° and 1250°C.<br>The oxidation began to proceed at 740°-760°C. The oxidation products of LaB6 and CeB6 were La(BO2)3 (monoclinic system) and noncrystalline B2O3, and Ce(BO2)3 (monoclinic system) and noncrystalline B2O3, respectively.<br>The oxidation rate was found to be expressed by the general oxidation rate equation, (dw)n=kt, and the estimated apparent activation energies were 123.7±0.9kcal/mol for LaB6 and 137.0±0.8kcal/mol for CeB6.

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  • 窯業協會誌

    窯業協會誌 90 (1038), 73-82, 1982

    公益社団法人 日本セラミックス協会

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