Abstract
By thermodynamic simulation of the Pr–Se–I system, the optimal growth conditions for new crystalline praseodymium polyselenide PrSe1.95, whose existence was proved in our previous works, are determined. Based on the obtained information, the PrSe1.95 crystals are grown by the vapor transport technique using iodine as the transport agent. The crystals produced are identified by microprobe and powder X-ray diffraction analysis. Single crystal X-ray diffraction shows that the crystals are not monophasic, but consist of blocks with tetragonal and monoclinic symmetries, which have a common structural prototype (PbFCl). For two different crystals cut out of a larger one, the structure is determined and the composition is refined. The results of powder and single crystal X-ray diffraction analyses of one of these crystals (monoclinic one) coincide.
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