Crystal structure and thermal expansion of Mo5SiB2

C. J. Rawn; J. H. Schneibel; C. M. Hoffmann; C. R. Hubbard

doi:10.1016/S0966-9795(00)00113-8

Crystal structure and thermal expansion of Mo₅SiB₂

C. J. Rawn, J. H. Schneibel, C. M. Hoffmann, C. R. Hubbard

Single Crystal Diffraction

Research output: Contribution to journal › Article › peer-review

76 Scopus citations

Abstract

Mo₅SiB₂ (T2), synthesized with ¹¹B, was studied using high temperature neutron powder diffraction. This ternary compound crystallizes with a tetragonal unit cell, space group I4/mcm, with room temperature lattice parameters a = 6.0272(3) and c = 11.0671(7) angstroms. The structural refinement reveals that B substitutes for a minor amount of Si for a formula of Mo₅Si_0.89B_2.11. 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)×10^-6 K^-1 and (7.5±0.2)×10^-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.

Original language	English
Pages (from-to)	209-216
Number of pages	8
Journal	Intermetallics
Volume	9
Issue number	3
DOIs	https://doi.org/10.1016/S0966-9795(00)00113-8
State	Published - Mar 2001

Funding

This research was sponsored by the Division of Materials Sciences, Office of Basic Energy Sciences and Engineering and by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory User Program, Oak Ridge National Laboratory. ORNL is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract number DE-AC05-00OR22725. CMH was supported in part by an appointment to the ORNL Postdoctoral Research Associates program jointly administered by ORAU and ORISE. The authors also thank Bryan Chakoumakos, ORNL, for assistance with the neutron powder diffraction data collection and processing, Larry Walker for the electron microprobe data, and Cecil Carmichael for the arc-melting.

Funders	Funder number
Division of Materials Sciences
Office of Basic Energy Sciences and Engineering
Office of Transportation Technologies
U.S. Department of Energy	DE-AC05-00OR22725
Office of Energy Efficiency and Renewable Energy
Oak Ridge Associated Universities
Oak Ridge National Laboratory
Oak Ridge Institute for Science and Education

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title = "Crystal structure and thermal expansion of Mo5SiB2",

abstract = "Mo5SiB2 (T2), synthesized with 11B, was studied using high temperature neutron powder diffraction. This ternary compound crystallizes with a tetragonal unit cell, space group I4/mcm, with room temperature lattice parameters a = 6.0272(3) and c = 11.0671(7) angstroms. 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)×10-6 K-1 and (7.5±0.2)×10-6 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.",

author = "Rawn, {C. J.} and Schneibel, {J. H.} and Hoffmann, {C. M.} and Hubbard, {C. R.}",

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AU - Rawn, C. J.

AU - Schneibel, J. H.

AU - Hoffmann, C. M.

AU - Hubbard, C. R.

PY - 2001/3

Y1 - 2001/3

N2 - Mo5SiB2 (T2), synthesized with 11B, was studied using high temperature neutron powder diffraction. This ternary compound crystallizes with a tetragonal unit cell, space group I4/mcm, with room temperature lattice parameters a = 6.0272(3) and c = 11.0671(7) angstroms. 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)×10-6 K-1 and (7.5±0.2)×10-6 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.

AB - Mo5SiB2 (T2), synthesized with 11B, was studied using high temperature neutron powder diffraction. This ternary compound crystallizes with a tetragonal unit cell, space group I4/mcm, with room temperature lattice parameters a = 6.0272(3) and c = 11.0671(7) angstroms. 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)×10-6 K-1 and (7.5±0.2)×10-6 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.

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Crystal structure and thermal expansion of Mo₅SiB₂

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