Abstract
The equation of state of the 6H polytype of SiC has been measured up to 68.4 GPa using a diamond anvil cell and synchrotron radiation. The pressure medium was NaCl in the ratio 3:1 NaCl:SiC and the pressure calibrant was Au. A small x‐ray beam (0.015 mm diameter) was used to further minimize the effect of pressure gradient. The 101 and 102 peaks of SiC were used to measure molar volumes. Pressure was based on molar volumes of Au using the 111, 200, and 220 peaks. A bulk modulus of K0=230.2±4.0 GPa was obtained by fitting the data to the Birch‐Murnaghan equation assuming K’0=4. These values are in good agreement with earlier unpublished measurements (Kd0=234.3±4.9 GPa; K’0=4) made by us in which NaCl was used as the pressure calibrant. Our compression measurements appear to indicate a stiffer behavior than those based on shock measurements.
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