Abstract
We report the results of ambient temperature high pressure Raman and synchrotron based ADXRD study of CsIBr2 up to 32 and 25 GPa respectively. Raman spectroscopic measurements indicate two phase transitions above 5 and 19 GPa respectively. High pressure ADXRD measurements reveal that the ambient orthorhombic (SG:Pnma) phase of CsIBr2 is stable up to a pressure of 5 GPa above which a phase transition to a trigonal (SG:P-3c1) phase, coexisting with the ambient phase, is observed. The stability region of the trigonal phase has been found to be up to 19.4 GPa above which another phase transition is observed. A third order and second order Birch-Murnaghan equation of state fit to pressure dependence of unit cell volume yielded a bulk modulus of 10.9(8) GPa and 17.8(1) GPa for the orthorhombic and trigonal phase respectively.
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