Add time:09/07/2019         Source:sciencedirect.com

Lanthanum hexaboride is an interesting compound in view of its thermoemissive properties. So far, it has usually been prepared in the form of very small crystals. Preparation of single crystals is essential for the studies of its basic properties. Two methods have been used to crystallize this compound, namely gas-phase crystallization, and pulling seeds from a molten drop.In the vapour-phase crystallization a chemical reaction took place resulting in a formation of lanthanum hexaboride crystals. Lanthanum oxide, boron trichloride and hydrogen were used for the reaction. The apparatus used for this process is presented. The starting material for the liquid phase crystallization method was the LaB6 powder formed in the reaction of La2O3 with boron. LaB6 powder was initially melted to form rods inside a water-cooled boat in an argon-hydrogen atmosphere. LaB6 rods were then crystallized by the melting-drop method. Details are given of apparatus for melting and crystallization. Some electro-optical properties of LaB6 were measured.

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