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The reversible cubic ↔ rhombohedral (O ↔ C) phase transition of GeTe-rich (GeTe)1–x[(Ag2Te)0.5333(Bi2Te3)0.4667]xsolid solutions is studied by means of high temperature X-ray analysis. Temperature and composition changes of the rhombohedral lattice parameters are found. They prove the displacive nature of the solid solution phase transition. With increasing amount of heterovalent Ag and Bi atoms replacing Ge cations the phase transition temperature Tc decreases.
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Plachkova et al. (1991) studied this question.
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