The crystal structure and thermal expansion of Mo5SiB2

被引：73

作者：

Rawn, CJ ^{[1
]}

Schneibel, JH ^{[1
]}

Hoffmann, CM ^{[1
]}

Hubbard, CR ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA

来源：

INTERMETALLICS | 2001年 / 9卷 / 03期

关键词：

molybdenum silicides; thermal properties; crystallography;

D O I：

10.1016/S0966-9795(00)00113-8

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Mo5SiB2 (T2). synthesized with B-11, was studied using high temperature neutron powder diffraction. This ternary compound crystallizes with a tetragonal unit cell. space group 14/mcm. with room temperature lattice parameters a = 6.0271(3) c = 11.0671(7) Angstrom. The structural refinement reveals that B substitutes for a minor amount of Si for a formula of Mo5Si0.89B2.11. The refined lattice parameters studied as a function of temperature give average thermal expansion coefficients along the a and c-axes, (7.9 +/-0.1)x10-(6) K-1 and (7.5+/-0.2)x10(6) K-1, respectively. The thermal expansion of Mo5SiB2 is, therefore, nearly isotropic. A more detailed evaluation shows that the thermal expansion coefficient. as well as the thermal expansion anisotropy, vary with temperature. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：209 / 216

页数：8

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