X-ray diffraction study on pressure-induced phase transformations and the equation of state of ZnGa2Te4

Abstract

We report on high-pressure x-ray diffraction measurements up to 19.8 GPa in zinc digallium telluride (ZnGa 2 Te 4 ) at room temperature. An irreversible structural phase transition takes place at pressures above 12.1 GPa and upon decompression a third polymorph of ZnGa 2 Te 4 was recovered as a metastable phase at pressures below 2.9 GPa. Rietveld refinements were carried out for the three detected polymorphs, being their possible crystal structures reported. The axial compressibilities for the low-pressure phase of ZnGa 2 Te 4 have been determined as well as the equation of state of the low-and high-pressure phases. The reported results are compared with those available in the literature for related compounds. Pressure-induced coordination changes and transition mechanisms are also discussed. V C 2013 AIP Publishing LLC. [http://dx

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