Crystal structure of HgGa2Se4 under compression
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GOMIS, Oscar; VILAPLANA, Rosario Isabel; MANJON, Francisco Javier; SANTAMARIA-PEREZ, David; ERRANDONEA, Daniel J.H.; PEREZ-GONZALEZ, Eduardo; LOPEZ-SOLANO, Javier; RODRIGUEZ-HERNANDEZ, Placida Rogelio; MUNOZ, Alfonso Gonzalez; TIGINYANU, Ion; URSAKI, Veacheslav. Crystal structure of HgGa2Se4 under compression. In: Materials Research Bulletin. 2013, nr. 6(48), pp. 2128-2133. ISSN 0025-5408.
10.1016/j.materresbull.2013.02.037
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Materials Research Bulletin
Numărul 6(48) / 2013 / ISSN 0025-5408

Crystal structure of HgGa2Se4 under compression


DOI: 10.1016/j.materresbull.2013.02.037
Pag. 2128-2133

Gomis Oscar1, Vilaplana Rosario Isabel1, Manjon Francisco Javier1, Santamaria-Perez David23, Errandonea Daniel J.H.3, Perez-Gonzalez Eduardo4, Lopez-Solano Javier4, Rodriguez-Hernandez Placida Rogelio4, Munoz Alfonso Gonzalez4, Tiginyanu Ion5, Ursaki Veacheslav5
 
1 Universitat Politècnica de València,
2 Universidad Complutense de Madrid,
3 Universitat de València,
4 Universidad de La Laguna, La Laguna,
5 Institute of Applied Physics, Academy of Sciences of Moldova
 
Disponibil în IBN: 23 martie 2018


Rezumat

We report on high-pressure x-ray diffraction measurements up to 17.2 GPa in mercury digallium selenide (HgGa2Se4). The equation of state and the axial compressibilities for the low-pressure tetragonal phase have been determined and compared to related compounds. HgGa2Se 4 exhibits a phase transition on upstroke toward a disordered rock-salt structure beyond 17 GPa, while on downstroke it undergoes a phase transition below 2.1 GPa to a phase that could be assigned to a metastable zinc-blende structure with a total cation-vacancy disorder. Thermal annealing at low- and high-pressure shows that kinetics plays an important role on pressure-driven transitions.

Cuvinte-cheie
A. Chalcogénides, C. High pressure, C. X-ray diffraction, D. Crystal structure, D. Phase transitions