Thermal and electrical properties of Nb2AlC, (Ti, Nb)2AlC and Ti2AlC

M. W. Barsoum; I. Salama; T. El-Raghy; J. Golczewski; W. D. Porter; H. Wang; H. J. Seifert; F. Aldinger

doi:10.1007/s11661-002-0262-7

Thermal and electrical properties of Nb₂AlC, (Ti, Nb)₂AlC and Ti₂AlC

M. W. Barsoum, I. Salama, T. El-Raghy, J. Golczewski, W. D. Porter, H. Wang, H. J. Seifert, F. Aldinger

Nuclear Energy Materials Microanalysis

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Abstract

The heat capacities, thermal-expansion coefficients, thermal and electrical conductivities of Nb₂AlC (actual Nb:Al:C mole fractions: 0.525 ± 0.005, 0.240 ± 0.002, and 0.235 ± 0.005, respectively), Ti₂AlC and (Ti, Nb)₂AlC (actual Ti:Nb:Al:C mole fractions: 0.244 ± 0.005, 0.273 ± 0.005, 0.240 ± 0.003, and 0.244 ± 0.005, respectively) were measured as a function of temperature. These ternaries are good electrical conductors, with a resistivity that increases linearly with increasing temperatures. The resistivity of (Ti, Nb)₂AlC is higher than the other members, indicating a solid-solution scattering effect. The thermal-expansion coefficients, in the 25°C to 1000°C temperature range, are comparable and fall in the narrow range of 8.7 to 8.9 × 10^-6 K^-1, with that of the solid solution being the highest. They are all good conductors of heat, with thermal conductivities in the range between 15 to 45 W/m K at room temperature. The electronic component of the thermal conductivity is the dominant mechanism at all temperatures for Nb₂AlC and (Ti, Nb)₂AlC. The conductivity of Ti₂AlC, on the other hand, is high because the phonon contribution to the conductivity is nonnegligible.

Original language	English
Article number	262
Pages (from-to)	2775-2779
Number of pages	5
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	33
Issue number	9
DOIs	https://doi.org/10.1007/s11661-002-0262-7
State	Published - 2002

Funding

We thank Professor Sommer, for carrying out the heat capacity measurements. This work was partially funded by the Division of Materials Research, National Science Foundation (Grant No. DMR 0072067). The support of Professor M. Ruehle and the Humboldt and Max Planck Foundations to one of the authors (MB) during his sabbatical leave in Germany is also gratefully acknowledged.

Funders	Funder number
National Science Foundation
Division of Materials Research

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title = "Thermal and electrical properties of Nb2AlC, (Ti, Nb)2AlC and Ti2AlC",

abstract = "The heat capacities, thermal-expansion coefficients, thermal and electrical conductivities of Nb2AlC (actual Nb:Al:C mole fractions: 0.525 ± 0.005, 0.240 ± 0.002, and 0.235 ± 0.005, respectively), Ti2AlC and (Ti, Nb)2AlC (actual Ti:Nb:Al:C mole fractions: 0.244 ± 0.005, 0.273 ± 0.005, 0.240 ± 0.003, and 0.244 ± 0.005, respectively) were measured as a function of temperature. These ternaries are good electrical conductors, with a resistivity that increases linearly with increasing temperatures. The resistivity of (Ti, Nb)2AlC is higher than the other members, indicating a solid-solution scattering effect. The thermal-expansion coefficients, in the 25°C to 1000°C temperature range, are comparable and fall in the narrow range of 8.7 to 8.9 × 10-6 K-1, with that of the solid solution being the highest. They are all good conductors of heat, with thermal conductivities in the range between 15 to 45 W/m K at room temperature. The electronic component of the thermal conductivity is the dominant mechanism at all temperatures for Nb2AlC and (Ti, Nb)2AlC. The conductivity of Ti2AlC, on the other hand, is high because the phonon contribution to the conductivity is nonnegligible.",

author = "Barsoum, {M. W.} and I. Salama and T. El-Raghy and J. Golczewski and Porter, {W. D.} and H. Wang and Seifert, {H. J.} and F. Aldinger",

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T1 - Thermal and electrical properties of Nb2AlC, (Ti, Nb)2AlC and Ti2AlC

AU - Barsoum, M. W.

AU - Salama, I.

AU - El-Raghy, T.

AU - Golczewski, J.

AU - Porter, W. D.

AU - Wang, H.

AU - Seifert, H. J.

AU - Aldinger, F.

PY - 2002

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N2 - The heat capacities, thermal-expansion coefficients, thermal and electrical conductivities of Nb2AlC (actual Nb:Al:C mole fractions: 0.525 ± 0.005, 0.240 ± 0.002, and 0.235 ± 0.005, respectively), Ti2AlC and (Ti, Nb)2AlC (actual Ti:Nb:Al:C mole fractions: 0.244 ± 0.005, 0.273 ± 0.005, 0.240 ± 0.003, and 0.244 ± 0.005, respectively) were measured as a function of temperature. These ternaries are good electrical conductors, with a resistivity that increases linearly with increasing temperatures. The resistivity of (Ti, Nb)2AlC is higher than the other members, indicating a solid-solution scattering effect. The thermal-expansion coefficients, in the 25°C to 1000°C temperature range, are comparable and fall in the narrow range of 8.7 to 8.9 × 10-6 K-1, with that of the solid solution being the highest. They are all good conductors of heat, with thermal conductivities in the range between 15 to 45 W/m K at room temperature. The electronic component of the thermal conductivity is the dominant mechanism at all temperatures for Nb2AlC and (Ti, Nb)2AlC. The conductivity of Ti2AlC, on the other hand, is high because the phonon contribution to the conductivity is nonnegligible.

AB - The heat capacities, thermal-expansion coefficients, thermal and electrical conductivities of Nb2AlC (actual Nb:Al:C mole fractions: 0.525 ± 0.005, 0.240 ± 0.002, and 0.235 ± 0.005, respectively), Ti2AlC and (Ti, Nb)2AlC (actual Ti:Nb:Al:C mole fractions: 0.244 ± 0.005, 0.273 ± 0.005, 0.240 ± 0.003, and 0.244 ± 0.005, respectively) were measured as a function of temperature. These ternaries are good electrical conductors, with a resistivity that increases linearly with increasing temperatures. The resistivity of (Ti, Nb)2AlC is higher than the other members, indicating a solid-solution scattering effect. The thermal-expansion coefficients, in the 25°C to 1000°C temperature range, are comparable and fall in the narrow range of 8.7 to 8.9 × 10-6 K-1, with that of the solid solution being the highest. They are all good conductors of heat, with thermal conductivities in the range between 15 to 45 W/m K at room temperature. The electronic component of the thermal conductivity is the dominant mechanism at all temperatures for Nb2AlC and (Ti, Nb)2AlC. The conductivity of Ti2AlC, on the other hand, is high because the phonon contribution to the conductivity is nonnegligible.

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Thermal and electrical properties of Nb₂AlC, (Ti, Nb)₂AlC and Ti₂AlC

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