DOI: 10.1063/1.373555. Thermal properties of Ti4AlN3

10.1063/1.373555

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

In this article we report on the atomic displacement parameters, lattice expansions, heat capacity, and thermal conductivity of samples of Ti4AlN3 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 Ti4AlN2.9. 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)×10−6 and (8.8±0.1)×10−6 K−1. The unit cell expansivity, (9.4±0.1)×10−6 K−1, is in agreement with the dilatometric bulk thermal expansivity (9.7±0.2)×10−6 K−1. The heat capacity, cp, is 150 J/mol K at ambient temperatures and extrapolates to ≈220 J/mol K at 1300 K. At all temperatures cp equals four times the molar heat capacity of TiN. The room temperature thermal conductivity is 12 W/m K and increases linearly to ≈20 W/m K at 1300 K.

Bibliography

Barsoum, M. W., Rawn, C. J., El-Raghy, T., Procopio, A. T., Porter, W. D., Wang, H., & Hubbard, C. R. (2000). Thermal properties of Ti4AlN3. Journal of Applied Physics, 87(12), 8407â8414.

Authors 7

M. W. Barsoum (first)
C. J. Rawn (additional)
T. El-Raghy (additional)
A. T. Procopio (additional)
W. D. Porter (additional)
H. Wang (additional)
C. R. Hubbard (additional)

References 33 Referenced 79

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 9:55 a.m.)
Deposited	1 year, 6 months ago (Feb. 10, 2024, 11:29 a.m.)
Indexed	3 months, 1 week ago (May 21, 2025, 9:05 a.m.)
Issued	25 years, 2 months ago (June 15, 2000)
Published	25 years, 2 months ago (June 15, 2000)
Published Print	25 years, 2 months ago (June 15, 2000)

Funders 0

None

BibTeX

@article{Barsoum_2000, title={Thermal properties of Ti4AlN3}, volume={87}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.373555}, DOI={10.1063/1.373555}, number={12}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Barsoum, M. W. and Rawn, C. J. and El-Raghy, T. and Procopio, A. T. and Porter, W. D. and Wang, H. and Hubbard, C. R.}, year={2000}, month=jun, pages={8407–8414} }

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  "abstract": "<jats:p>In this article we report on the atomic displacement parameters, lattice expansions, heat capacity, and thermal conductivity of samples of Ti4AlN3 in the 298\u20131370 K temperature range. Rietveld refinement of high temperature neutron diffraction data shows that the nitrogen is substoichiometric and the formula is Ti4AlN2.9. In this structure, the atomic displacement parameters of the Al atoms are higher than those of either the Ti or N atoms. The Ti\u2013N bonds adjacent to the Al planes are about 2.5% shorter than the Ti\u2013N bonds in the inner layers. The thermal expansion coefficients along the a and c axes are, respectively, (9.6\u00b10.1)\u00d710\u22126 and (8.8\u00b10.1)\u00d710\u22126\u200aK\u22121. The unit cell expansivity, (9.4\u00b10.1)\u00d710\u22126\u200aK\u22121, is in agreement with the dilatometric bulk thermal expansivity (9.7\u00b10.2)\u00d710\u22126\u200aK\u22121. The heat capacity, cp, is 150 J/mol\u200aK at ambient temperatures and extrapolates to \u2248220 J/mol\u200aK at 1300 K. At all temperatures cp equals four times the molar heat capacity of TiN. The room temperature thermal conductivity is 12 W/m\u200aK and increases linearly to \u224820 W/m\u200aK at 1300 K.</jats:p>",
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