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SM ISO690:2012 VILAPLANA, Rosario Isabel, ROBLEDILLO, M., GOMIS, Oscar, SANS, J., MANJON, Francisco Javier, PEREZ-GONZALEZ, Eduardo, RODRIGUEZ-HERNANDEZ, Placida Rogelio, MUNOZ, Alfonso Gonzalez, TIGINYANU, Ion, URSAKI, Veacheslav. Vibrational study of HgGa2S4 under high pressure. In: Journal of Applied Physics, 2013, vol. 113, p. 0. ISSN 0021-8979. DOI: https://doi.org/10.1063/1.4794096 |
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Journal of Applied Physics | |
Volumul 113 / 2013 / ISSN 0021-8979 /ISSNe 1089-7550 | |
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DOI: https://doi.org/10.1063/1.4794096 | |
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In this work, we report on high-pressure Raman scattering measurements in mercury digallium sulfide (HgGa2S4) with defect chalcopyrite structure that have been complemented with lattice dynamics ab initio calculations. Our measurements evidence that this semiconductor exhibits a pressure-induced phase transition from the completely ordered defect chalcopyrite structure to a partially disordered defect stannite structure above 18 GPa which is prior to the transition to the completely disordered rocksalt phase above 23 GPa. Furthermore, a completely disordered zincblende phase is observed below 5 GPa after decreasing pressure from 25 GPa. The disordered zincblende phase undergoes a reversible pressure-induced phase transition to the disordered rocksalt phase above 18 GPa. The sequence of phase transitions here reported for HgGa2S4 evidence the existence of an intermediate phase with partial cation-vacancy disorder between the ordered defect chalcopyrite and the disordered rocksalt phases and the irreversibility of the pressure-induced order-disorder processes occurring in ordered-vacancy compounds. The pressure dependence of the Raman modes of all phases, except the Raman-inactive disordered rocksalt phase, have been measured and discussed. |
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Cuvinte-cheie Engineering controlled terms Copper compounds, Crystal lattices, Solids, Zinc sulfide Engineering uncontrolled terms Ab initio calculations, Defect chalcopyrite structure, Defect chalcopyrites, High pressure, Intermediate phase, Pressure dependence, Pressure-induced phase transition, Raman modes, Raman Scattering measurements, Rock salt, Rock-salt phase, Vibrational study, Zinc-blende Engineering main heading Defects |
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