Thermal properties of Ti4AlN3

• DOI: 10.1063/1.373555
• Publication Date: 2002-07-26T13:55:45Z
• Authors: M. W. Barsoum; C. J. Rawn; T. El-Raghy; A. T. Procopio; W. D. Porter; H. Wang; C. R. Hubbard
• Keywords: Atmospheric temperature range; Rietveld Refinement

In this article we report on the atomic displacement parameters, lattice expansions, heat capacity, and thermal conductivity of samples Ti4AlN3 in 298–1370 K temperature range. Rietveld refinement high neutron diffraction data shows that nitrogen is substoichiometric formula Ti4AlN2.9. structure, parameters Al atoms are higher than those either Ti or N atoms. The Ti–N bonds adjacent to planes about 2.5% shorter inner layers. expansion coefficients along a c axes are, respectively, (9.6±0.1)×10−6 (8.8±0.1)×10−6 K−1. unit cell expansivity, (9.4±0.1)×10−6 K−1, agreement with dilatometric bulk expansivity (9.7±0.2)×10−6 cp, 150 J/mol at ambient temperatures extrapolates ≈220 1300 K. At all cp equals four times molar capacity TiN. room 12 W/m increases linearly ≈20