NSM Archive - Aluminium Nitride (AlN) - Thermal properties
Thermal properties
- Basic parameters
- Thermal conductivity
- Thermal expansion
- Lattice properties
Basic parameters
| Wurtzite crystal structure | Remarks | Referens | |
| Bulk modulus | 21 x 1011 dyn cm -2 | Goldberg (2001) | |
| Debye temperature | 1150 K | ||
| Melting point | 3273 K | MacChesney et al. (1970) | |
| 3023 K (between 100 and 500 atm of nitrogen) |
Goldberg (2001) | ||
| Specific heat | 0.6 J g-1°C -1 | ||
| Thermal diffusivity |
1.47 cm2 s-1 | ||
| Thermal conductivity | 2.85 W cm-1 °C -1 |
300 K. experiment | Slack et al. (1987) |
| Thermal expansion coefficient, linear | αort = αc = 5.27 x10-6 K-1 | T=20...800 °C. X-ray, epitaxial layers | Sirota & Golodushko (1974) also see Qian et al. (1996) |
| α|| = αa = 4.15 x10-6 K-1 |
Thermal conductivity
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AlN, Wurtzite sructure. The thermal conductivity K vs. temperature
for high-purity AlN. Experimental data. Slack et al. (1987) |
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AlN, Wurtzite sructure. The thermal conductivity K vs. temperature. 1 -- AlN single crystal with no oxygen and a sample diameter of 0.54 cm (estimate); 2 -- AlN single crystal containing N0 ~= 4.2 x 1019 cm-3 oxygen atoms (measure); 3 -- N0 ~= 3 x 1020 cm-3 oxygen atoms. Slack et al. (1987) |
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AlN, Wurtzite sructure. Conductivity vs. reciprocal temperature
for hot-pressed material. EA: activation energy for conductivity. Francis & Worrell (1976) |
| At 0.4 < T < 3 K: | K ~ T2.54 |
| At 500 < T < 1800 K: | K ~ T-1.25 |
The specific heat Cp of AlN at constant pressure
| At 300< T< 1800K, | Cp = 45.94 + 3.347 x 10-3 x T -14.98 x 105 x T -2 | (J mol-1 K) | Koshchenko et al. (1984) |
| At 1800 < T < 2700 K, | Cp = 37.34 + 7.866 x 10-3 x T | (J mol-1 K) |
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AlN. The specific heat vs. temperature at constant pressure. Koshchenko et al. (1984) |
Thermal Expansion
For the direction along the c-axis:| At 300 : αc = 5.3 x 10-6 K-1 |
Slack and Bartram (1975), Touloukian at al. (1977), Meng (1994), Morkoc et al. (1994) Qian et al. (1996) |
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| At 293 < T < 1700 K, Δc/c300 = -7.006 x 10-2 + 1.583 x 10-4 x T + 2.719 x 10-7 x T2 - 5.834 x 10-11 x T3 |
For the perpendiculardiraection:
| At 300 : αa = 4.2 x 10-6 K-1 |
Slack and Bartram (1975), Touloukian at al. (1977), Meng (1994), Morkoc et al. (1994) Qian et al. (1996) |
| At 293 < T < 1700 K, Δa/a300 = -8.679 x 10-2 + 1.929 x 10-4 x T + 3.400 x 10-7 x T2 -7.969 x 10-11 x T3 |
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AlN. The linear expansion coefficient α vs. temperature
for ceramic AlN samples. α = 1/3 (Δc/c + 2Δa/a) Slack & Bartram (1975) |
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Calculated vapor pressure of Al and N2 in equilibrium
with solid AlN and liquid Al. Meng (1994) |