X-ray studies on phase equilibria in {Tm, Lu}-W-B ternary systems at 1070 K

被引：2

作者：

Chaban, NF ^{[1
]}

Mikhalenko, SI ^{[1
]}

Kuz'ma, YB ^{[1
]}

机构：

[1] Ivan Franko Lvov State Univ, Lvov, Ukraine

来源：

POWDER METALLURGY AND METAL CERAMICS | 2000年 / 39卷 / 5-6期

关键词：

boride; structure; phase equilibrium; isothermal section;

D O I：

10.1007/BF02684675

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Isothermal sections at 1070 K have been constructed by x-ray diffraction applied to the phase diagrams in the Tm - W - B and Lu - W -B systems. The solubility of "WB2" in TmB2 is low, while that in LuB2 attains 0.15 molar fraction (lattice parameters of the (Lu, W) Bz phase with a limiting composition and having the AlB2 structure a = 0.31772(6), c = 0.35804(9) nm). The distinct bop ide reported previously Tm3WB7 is confirmed (Er3CrB7 structure type). New ternary compounds have been identified and examined by powder method (DRON-3M diffractometer): TmWB4 (space group Pbam, structure type YCrB4, a = 0.59989(2), b = 1.15866(4), c = 0.35821(1) nm, N-hkl = 157, R = 0.0796) and Lu2WB6 (Pbam, structure type Y2ReB6, a = 0.91339(4), b = 1.14865(5), c = 0.35124(2) nm, N-hkl = 408, R = 0.0981).

引用

页码：251 / 255

页数：5