X-ray-diffraction study of the equation of state and the phase transition in cesium iodide at nearly hydrostatic pressure

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Abstract
X-ray-diffraction study of CsI was performed along the room-temperature isotherm up to pressure of 52 GPa by using a diamond-anvil cell and compressed helium as a pressure medium. It turned out that the equation-of-state data obtained differ from the results of previous nonhydrostatic measurements, with the latter overestimating the pressure. The phase diagram of CsI is found to be sensitive to the hydrostaticity of a pressure transmitting medium as well. The experimental data suggest that the cubic phase of CsI transforms directly into the orthorhombic one under hydrostatic conditions.

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