Author/Authors :
Gomis، نويسنده , , Oscar and Vilaplana، نويسنده , , Rosario and Manjَn، نويسنده , , Francisco Javier and Santamarيa-Pérez، نويسنده , , David and Errandonea، نويسنده , , Daniel and Pérez-Gonzلlez، نويسنده , , Eduardo and Lَpez-Solano، نويسنده , , Javier and Rodrيguez-Hernلndez، نويسنده , , Plلcida and Muٌoz، نويسنده , , Alfonso and Tiginyanu، نويسنده , , Ion Mihail and Ursa، نويسنده ,
Abstract :
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. HgGa2Se4 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.
Keywords :
A. Chalcogénides , D. Phase transitions , D. Crystal structure , C. High pressure , C. X-ray diffraction
