Static compression of α-MnS at 298 K to 21 GPa

✍ Scribed by Catherine McCammon

• Book ID: 104662464
• Publisher: Springer-Verlag
• Year: 1991
• Tongue: English
• Weight: 525 KB
• Volume: 17
• Category: Article
• ISSN: 0342-1791
• DOI: 10.1007/bf00203844

✦ Synopsis

To investigate the equation of state of 7-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 Ko = 72(2) GPa and K~=4.2(13). To compare present results with previous work, the data sets from three previous investigations 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. 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.