High-pressure Raman scattering study of defect chalcopyrite and defect stannite ZnGa2Se4
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VILAPLANA, Rosario Isabel; GOMIS, Oscar; PEREZ-GONZALEZ, Eduardo; ORTIZ, Henry M; MANJON, Francisco Javier; RODRIGUEZ-HERNANDEZ, Placida Rogelio; MUNOZ, Alfonso Gonzalez; ALONSO-GUTIÉRREZ, Pablo; SANJUÁN, María Luisa; URSAKI, Veacheslav; TIGINYANU, Ion. High-pressure Raman scattering study of defect chalcopyrite and defect stannite ZnGa2Se4. In: Journal of Applied Physics. 2013, nr. 23(113), p. 0. ISSN 0021-8979.
10.1063/1.4810854
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Journal of Applied Physics
Numărul 23(113) / 2013 / ISSN 0021-8979

High-pressure Raman scattering study of defect chalcopyrite and defect stannite ZnGa2Se4


DOI: 10.1063/1.4810854
Pag. 0-0

Vilaplana Rosario Isabel1, Gomis Oscar1, Perez-Gonzalez Eduardo2, Ortiz Henry M314, Manjon Francisco Javier1, Rodriguez-Hernandez Placida Rogelio2, Munoz Alfonso Gonzalez2, Alonso-Gutiérrez Pablo5, Sanjuán María Luisa5, Ursaki Veacheslav6, Tiginyanu Ion6
 
1 Universitat Politècnica de València,
2 Universidad de La Laguna, La Laguna,
3 Universidad Distrital Fco. José de Caldas, Bogotá,
4 CINVESTAV-Departamento de Nanociencia y Nanotecnología, Unidad Querétaro,
5 Universidad de Zaragoza, Zaragoza,
6 Institute of Applied Physics, Academy of Sciences of Moldova
 
Disponibil în IBN: 22 martie 2018


Rezumat

High-pressure Raman scattering measurements have been carried out in ZnGa2Se4 for both tetragonal defect chalcopyrite and defect stannite structures. Experimental results have been compared with theoretical lattice dynamics ab initio calculations and confirm that both phases exhibit different Raman-active phonons with slightly different pressure dependence. A pressure-induced phase transition to a Raman-inactive phase occurs for both phases; however, the sample with defect chalcopyrite structure requires slightly higher pressures than the sample with defect stannite structure to fully transform into the Raman-inactive phase. On downstroke, the Raman-inactive phase transforms into a phase that could be attributed to a disordered zincblende structure for both original phases; however, the sample with original defect chalcopyrite structure compressed just above 20 GPa, where the transformation to the Raman-inactive phase is not completed, returns on downstroke mainly to its original structure but shows a new peak that does not correspond to the defect chalcopyrite phase. The pressure dependence of the Raman spectra with this new peak and those of the disordered zincblende phase is also reported and discussed.

Cuvinte-cheie
ab initio calculations,

Defect chalcopyrite structure, Defect chalcopyrites, Pressure dependence, Pressure-induced phase transition, Raman Scattering measurements, Raman-active phonon, Zinc-blende structures