CRYSTAL STRUCTURE OF BINARY MOLYBDATE Pr2Hf3(MoO4)9
B. G. Bazarov, V. G. Grossman, R. F. Klevtsova, A. G. Anshits, T. A. Vereshchagina, L. A. Glinskaya, Y. L. Tushinova, K. N. Fedorov, Z. G. Bazarova
Keywords: thallium, praseodymium, hafnium, binary molybdates, kosnarite, crystal structure
Pages: 587-590
Abstract
Crystals of binary praseodymium and hafnium molybdate of Pr2Hf3(MoO4)9 composition are grown by solution-melt crystallization under spontaneous nucleation conditions. By the X-ray diffraction data (X8 Apex automated diffractometer, МоKα radiation, 2262 F(hkl), R = 0.0170) its composition and crystal structure are determined. Parameters of the trigonal unit cell are: a = b = 9.8001(1) Å, c = 58.7095(8) Å, V = 4883.15(10) Å3, Z = 6, space group R3c. The crystal structure is composed of three types of polyhedra: МоО4 tetrahedra, HfO6 octahedra, and nine-vertex PrO9. All three types of polyhedra are bonded among themselves by common oxygen vertices of bridging МоО4 tetrahedra forming an openwork three-dimensional structure.
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