|Conţinutul numărului revistei|
| SM ISO690:2012|
GALLEGO-PARRA, Samuel; GOMIS, Oscar; VILAPLANA, Rosario Isabel; ORTIZ, Henry M; PEREZ-GONZALEZ, Eduardo; LUNA, Ramon; RODRIGUEZ-HERNANDEZ, Placida Rogelio; MUNOZ, Alfonso Gonzalez; URSAKI, Veacheslav; TIGINYANU, Ion; MANJON, Francisco Javier. Vibrational properties of CdGa 2 S 4 at high pressure. In: Journal of Applied Physics. 2019, nr. 11(125), p. 0. ISSN 0021-8979.
|Journal of Applied Physics|
|Numărul 11(125) / 2019 / ISSN 0021-8979|
Raman scattering measurements have been performed in cadmium digallium sulphide (CdGa 2 S 4 ) with defect chalcopyrite structure up to 25 GPa in order to study its pressure-induced phase transitions. These measurements have been complemented and compared with lattice-dynamics ab initio calculations including the TO-LO splitting at high pressures in order to provide a better assignment of experimental Raman modes. In addition, experimental and theoretical Grüneisen parameters have been reported in order to calculate the molar heat capacity and thermal expansion coefficient of CdGa 2 S 4 . Our measurements provide evidence that CdGa 2 S 4 undergoes an irreversible phase transition above 15 GPa to a Raman-inactive phase, likely with a disordered rock salt structure. Moreover, the Raman spectrum observed on downstroke from 25 GPa to 2 GPa has been attributed to a new phase, tentatively identified as a disordered zinc blende structure, that undergoes a reversible phase transition to the Raman-inactive phase above 10 GPa.
Cadmium compounds, Calculations, Copper compounds, Crystal lattices, Gallium compounds, Raman scattering, specific heat, Thermal expansion, Zinc sulfide