Crystal structure of HgGa{sub 2}Se{sub 4} under compression

Highlights: ► Single crystals of HgGa{sub 2}Se{sub 4} with defect-chalcopyrite structure were synthesized. ► HgGa{sub 2}Se{sub 4} exhibits a phase transition to a disordered rock salt structure at 17 GPa. ► HgGa{sub 2}Se{sub 4} undergoes a phase transition below 2.1 GPa to a disordered zinc blende....

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Bibliographic Details
Published in:Materials research bulletin 2013-06, Vol.48 (6)
Main Authors: Gomis, Oscar, Vilaplana, Rosario, Manjón, Francisco Javier, Santamaría-Pérez, David, Departamento de Física Aplicada-ICMUV, MALTA Consolider Team, Universidad de Valencia, Edificio de Investigación, C/Dr. Moliner 50, Burjassot, 46100 Valencia, Errandonea, Daniel
Format: Article
Language:English
Subjects:
ANNEALING
CATIONS
CHALCOPYRITE
COMPRESSION
KINETICS
MATERIALS SCIENCE
MERCURY
MONOCRYSTALS
PHASE TRANSFORMATIONS
SALT DEPOSITS
X-RAY DIFFRACTION
ZINC SULFIDES
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Summary:Highlights: ► Single crystals of HgGa{sub 2}Se{sub 4} with defect-chalcopyrite structure were synthesized. ► HgGa{sub 2}Se{sub 4} exhibits a phase transition to a disordered rock salt structure at 17 GPa. ► HgGa{sub 2}Se{sub 4} undergoes a phase transition below 2.1 GPa to a disordered zinc blende. - Abstract: We report on high-pressure x-ray diffraction measurements up to 17.2 GPa in mercury digallium selenide (HgGa{sub 2}Se{sub 4}). The equation of state and the axial compressibilities for the low-pressure tetragonal phase have been determined and compared to related compounds. HgGa{sub 2}Se{sub 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.
ISSN:0025-5408
1873-4227
DOI:10.1016/J.MATERRESBULL.2013.02.037