Journal article
Thermal properties of Ti{sub 4}AlN{sub 3}
Journal of applied physics, v 87(12)
15 Jun 2000
Abstract
In this article we report on the atomic displacement parameters, lattice expansions, heat capacity, and thermal conductivity of samples of Ti{sub 4}AlN{sub 3} in the 298-1370 K temperature range. Rietveld refinement of high temperature neutron diffraction data shows that the nitrogen is substoichiometric and the formula is Ti{sub 4}AlN{sub 2.9}. In this structure, the atomic displacement parameters of the Al atoms are higher than those of either the Ti or N atoms. The Ti-N bonds adjacent to the Al planes are about 2.5% shorter than the Ti-N bonds in the inner layers. The thermal expansion coefficients along the a and c axes are, respectively, (9.6{+-}0.1)x10{sup -6} and (8.8{+-}0.1)x10{sup -6} K{sup -1}. The unit cell expansivity, (9.4{+-}0.1)x10{sup -6} K{sup -1}, is in agreement with the dilatometric bulk thermal expansivity (9.7{+-}0.2)x10{sup -6} K{sup -1}. The heat capacity, c{sub p}, is 150 J/mol K at ambient temperatures and extrapolates to {approx_equal}220 J/mol K at 1300 K. At all temperatures c{sub p} equals four times the molar heat capacity of TiN. The room temperature thermal conductivity is 12 W/m K and increases linearly to {approx_equal}20 W/m K at 1300 K. (c) 2000 American Institute of Physics.
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Details
- Title
- Thermal properties of Ti{sub 4}AlN{sub 3}
- Creators
- M. W Barsoum - Drexel UniversityC. J Rawn - Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)T El-Raghy - Department of Materials Engineering, Drexel University, Philadelphia, Pennsylvania 19104 (United States)A. T Procopio - Department of Materials Engineering, Drexel University, Philadelphia, Pennsylvania 19104 (United States)W. D Porter - Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)H Wang - Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)C. R Hubbard - Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
- Publication Details
- Journal of applied physics, v 87(12)
- Publisher
- American Institute of Physics (AIP)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000087346400023
- Scopus ID
- 2-s2.0-0001218105
- Other Identifier
- 991019167774604721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Physics, Applied