Abstract
Single crystals of AlxCuyB105 (hexagonal system, space group: R 3m) were prepared by the reaction between metals and elemental boron using a molten copper flux in an argon atmosphere. The conditions for obtaining one-phase materials were determined. As-grown AlxCuyB105 single crystals were used for chemical analysis, and measurements of lattice constants, density and Vickers microhardness. The optimum mixing atomic ratio of the starting materials (B/Al and B/Cu), heating temperature and soaking time are B/Al=4/2, B/Cu=4/20, 1500°C, and 3h, respectively. Under these conditions, the single crystals were obtained in the form of an irregular or rhombohedral plate: the latter crystals were bounded by {001} planes. The single crystals had metallic luster of silver (Al2.8Cu2.9B105) or grayish brown (Al3.7Cu0.8B105) color. The results of themical analysis and the measurements of lattice constants and densities (dm) are as follows: Al2.8Cu2.9B105; ahex.=10.9993 (5) (A), chex.=23.9659 (8) (A), V=2511.0 (2) (A3), dm=2.70 (2)g/cm3 Al3.1Cn1.7B105; ahex.=10.9946 (4) (A), chex.=23.9530 (12) (A), V=2507.6 (2) (A3), dm=2.58 (1)g/cm3 Al3.7Cu0.8B105; ahex.=10.9803 (3) (A), chex.=23.9298 (12) (A), V=2498.6 (2) (A3), dm=2.48 (2)g/cm3 Average values of Vickers microhardness determined on {001} faces of AlxCuyB105 single crystals fell in the range 2530-3130kg/mm2.
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