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Component interactions in {Y, Gd, Tm} - Mo - B ternary systems at 1270 K

  • Physicochemical And Structural Investigations Of Materials
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Powder Metallurgy and Metal Ceramics Aims and scope

Abstract

X-ray structure analysis has been used to construct isothermal sections at 1270 K for the phase diagrams for the Y - Mo - B and Tm - Mo - B systems. The solubility of MoB2 in YB2 is low, while that in TmB2 is not more than 0.05 molar fraction (lattice constants of the (Tm, Mo)B2 phase with the AlB2 structure and limiting composition a=0.3253(2), c=0.3678(4) nm). The existence of some previously known borides is confirmed. and the lattice parameters for some of them have been refined: YMoB4 (space group Pbam, structure type YCrB4, a=0.6038(1), b=1.1672(2), c=0.36170(7) nm), YMo3B7 (Pnma, own structure type), GdMoB4 (Pbam, type YCrB4, a=0.60531(6), b=1.1700(1), c=0.36355(6) nm), Tm2MoB6 (Pbam, type Y2ReB6), TmMo2B7 (Pnma, type YMo3B7). New ternary compounds have been identified: Y3MoB7 (Cmcm, type Er3CrB7, a=0.34775(2), b=1.59793(5), c=0.94757(2) nm), Gd3MoB7 (type Er3CrB7, a=0.3497(2), b=1.6157(6), c=0.9516(5) nm), and TmMoB3 (P21/m, type ErMoB3, a=0.6771(2), b=0.3142(1), c=0.5373(1), β=101.48(2)°). The parameters of the metal atoms and their isotropic temperature factors have been refined for Y3MoB7 (DRON-3M diffractometer, Nhkl=288, R=0.106).

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  1. Ivan Franko L’vov State University, USSR

    N. F. Chaban, S. I. Mikhalenko & Yu. B. Kuz’ma

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  1. N. F. Chaban
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  2. S. I. Mikhalenko
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Translated from Poroshkovaya Metallurgiya, Nos, 1–2(411), pp. 56–62, January–February, 2000.

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Chaban, N.F., Mikhalenko, S.I. & Kuz’ma, Y.B. Component interactions in {Y, Gd, Tm} - Mo - B ternary systems at 1270 K. Powder Metall Met Ceram 39, 48–54 (2000). https://doi.org/10.1007/BF02677441

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