Lattice parameters values and phase diagram for the Cu2Zn1−zMnzGeSe4 alloy system (original) (raw)
2014, Journal of Alloys and Compounds
The T(z) phase diagram of the Cu 2 Zn 1Àz Mn z GeSe 4 alloy system is obtained from X-ray diffraction and differential thermal analysis DTA. At room temperature, the X-ray diffraction data showed that samples in the ranges 0 < z < 0.375 had the tetragonal stannite a structure (I 42m), while for 0.725 < z 6 1 the wurtz-stannite d structure (Pmn2 1 ). The a and d fields are separated by a relative wide three-phase field (a + d + MnSe 2 ). The DTA thermograms were used to construct the phase diagram of the Cu 2 Zn 1Àz Mn z -GeSe 4 alloy system. It was confirmed that the Cu 2 ZnGeSe 4 and Cu 2 MnGeSe 4 compounds melt incongruently. It was observed that undercooling effects occur for samples in the range 0.725 < z < 0.925.
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