MnGa2Te4-II, a high pressure modification of digallium managnese tetratelluride

Article abstract of DOI:10.1016/0022-5088(90)90450-X

MnGa₂Te₄ has a very complicated crystal structure, in spite of its relatively simple stoichiometric AB₂X₄ composition. A preliminary crystal structure determination shows that the anions form a distorted cubic close-packed arrangement with all cations located in tetrahedral holes, as in the homologous compound MnIn₂Te₄. In contrast to MnIn₂Te₄, however, the occupied Te₄ tetrahedra are not only corner-shared, but edge-shared as well. Because the stability of manganese in tetrahedral coordination by tellurium decreases with increasing pressure, a pressure-induced phase transformation for MnGa₂Te₄ was expected. This paper describes the results of high-pressure experiments with MnGa₂Te₄ and the structure refinement of the high-pressure phase MnGa₂Te₄-II.