Determination of phase transition pressures of ZnTe under quasihydrostatic conditions |
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| Authors: | Keiji Kusaba Laurence Galoisy Yanbin Wang Michael T Vaughan Donald J Weidner |
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| Institution: | (1) Center for High Pressure Research, Department of Earth and Space Sciences, State University of New York at Stony Brook, 11794 Stony Brook, N.Y., USA |
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| Abstract: | Pressure behavior of ZnTe at room temperature was studied using an X-ray energy dispersive method on a DIA type cubic anvil apparatus (SAM-85) at NSLS-X17B1. By using powdered polyethylene, the sample and NaCl for a pressure scale were held under quasihydrostatic conditions, which were confirmed by X-ray diffraction method. Two high-pressure phase transitions were confirmed using X-ray powder diffraction simultaneously with electrical resistance measurements. The phase transition pressures under quasihydrostatic conditions were determined to be 9.6 GPa, at which the resistance increased, and 12.0 GPa, which was the midpoint of a large resistance decrease. Errors in the pressure determinations were estimated to be less than 0.2 GPa. These pressure values may depend on grain size and anisotropic stress effects on the calibrant. From X-ray observation of ZnTe, the bulk modulus of the zinc blende structure was calculated to beK
0=51(3) GPa andK
0
=3.6(0.8), and the first transition at 9.6 GPa was found to have about 9% volume change. It was consistent with an anomaly in the pressure generating curves. |
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| Keywords: | High pressure pressure calibration ZnTe synchrotron X-ray source DIA type cubic anvil apparatus |
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