Yield properties, phase transition, and equation of state of aluminum nitride (AlN) under shock compression up to 150 GPa
| Autor: | Akira Nakamura, Takamichi Kobayashi, Eiichi Takasawa, Toshimori Sekine, Yasuhiko Syono, Masakazu Uchino, Kiyoto Fukuoka, Yuichi Noguchi, Hideaki Hikosaka, Tsutomu Mashimo |
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| Rok vydání: | 1999 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 86:6710-6716 |
| ISSN: | 1089-7550 0021-8979 |
| Popis: | Inclined-mirror Hugoniot measurements were performed on pure AlN polycrystals in the pressure range up to 150 GPa to study the yield properties, phase transition, and equation of state. The Hugoniot-elastic limit (HEL) stress was approximately 9.4 GPa. Above the HEL, the Hugoniot data converged to a static compression curve despite the high thermal conductivity, which indicated that the thermal property is not an important factor in determining the shock yield property. The phase transformation from wurtzite-type (B4) to rock salt-type (B1) structure took place at approximately 19.4 GPa, and was completed by about 75 GPa. The corrected transition pressure at 298 K was 19.2 GPa. Shock velocity (Us) versus particle velocity (Up) relation of the final phase was given by Us=3.27+1.81Up km/s. The Birch–Murnaghan fitting curve of the calculated isothermal compression curve of the B1-type phase roughly coincided with the recent static x-ray diffraction data up to over 100 GPa. The Gruneisen parameter, bulk moduli (K0), and the pressure derivative (K0′) at zero pressure of the B1-type phase were estimated to be 1.51±0.03, 304±4 GPa, and 3.9±0.2 (K0″=−0.02), respectively. |
| Databáze: | OpenAIRE |
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