Static compression of α-MnS at 298 K to 21 GPa
Tóm tắt
To investigate the equation of state of α-MnS at high pressure and the possibility of a phase transition, the compression curve was measured at 298 K from 0 to 21 GPa using powder x-ray diffraction with a diamond anvil cell. The compression data are fit to a thirdorder Birch-Murnaghan equation of state, with parameters K
0
= 72(2) GPa and K′
0 = 4.2(13). To compare present results with previous work, the data sets from three previous investigations (Clendenen and Drickamer 1966; Wakabayashi et al. 1968; Kraft and Greuling 1988) are refit to a Birch-Murnaghan equation of state. In the low pressure region (P < 10 GPa), the results of Clendenen and Drickamer (1966) agree with the present data; however the results of Wakbayashi et al. (1968) differ by more than 10%. A greater discrepancy between the present and previous results occurs above 10 GPa. Kraft and Greuling (1988) reported a structure transition at 7 GPa, and Clendenen and Drickamer (1966) observed a structure distortion at approximately 10 GPa; the present data show no evidence of either transition, and are well fit by a single equation of state from 0 to 21 GPa. Nonhydrostatic stress is discussed as one possibility for the discrepancy.
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