Abstract

The Se-TlPrSe3 system has been studied using differential thermal analysis, X-ray diffraction, microstructural analysis, microhardness tests, and density measurements, and its phase diagram has been constructed. The Se-TlPrSe3 system is shown to be partially nonpseudobinary. The system contains α-TlPrSe3-based solid solutions with a boundary at 8 mol % Se. The Se solubility in TlPrSe3 is insignificant. α-TlPrSe3 has a tetragonal structure with lattice parameters a = 8.87 A and c = 7.96 A (ρmeas = 7.36 g/cm3, and ρx = 7.71 g/cm3).

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