β-Rhombohedral Boron型固溶体Al_xCu_yB_<105>(x=2.8〜3.7,y=2.9〜0.8)結晶の合成

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Single crystals of Al_xCu_yB_<l05>(hexagonal system, space group : R3^^-m) 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 Al_xCu_yB_<l05> 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℃, 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 (Al_<2.8>Cu_<2.9>B_<105>) or grayish brown (A1_<3.7>Cu_<0.8>B_<l05>) color. The results of chemical analysis and the measurements of lattice constants and densities (d_m) are as follows: Al_<2.8>Cu_<2.9>B_<l05>;α_<hex.>=10.9993(5) (Å), c_<hex.>=23.9659 (8)(Å^3),V=2511.0 (2) (Å^3),d_m=2.70(2)g/cm^3 Al_<2.8>Cu_<2.9>B_<105>; α_<hex.>=10.9946(4)(Å), c_<hex.>=23.9530 (12)(Å).V=2507.6 (2) (Å^3), d_m=2.58(1)g/cm^3 Al_<3.7>Cu_<0.8>B_<l05>;α_<hex.>=10.9803(3)(Å),c_<hex.>=23.9298 (12)(Å),V=2498.6 (2) (Å^3),d_m=2.48(2)g/cm^3 Average values of Vickers microhardness determined on {001} faces of Al_xCu_yB_<l05> single crystals fell in the range 2530-3130 kg/mm^2.
社団法人日本セラミックス協会の論文
1988-06-01

β-Rhombohedral Boron型固溶体Al_xCu_yB_<105>(x=2.8〜3.7,y=2.9〜0.8)結晶の合成

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