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Orthorhombic HP‐PrO 2 – High‐Pressure Synthesis and Crystal Structure
Author(s) -
Haberer Almut,
Huppertz Hubert
Publication year - 2010
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200900441
Subject(s) - orthorhombic crystal system , crystal structure , praseodymium , crystallography , ion , tetrahedron , materials science , diffraction , lattice (music) , chemistry , inorganic chemistry , physics , organic chemistry , acoustics , optics
The high‐pressure phase of PrO 2 was synthesized under conditions of 5.5 GPa and 1000 °C in a Walker‐type multianvil apparatus. The crystal structure was determined on the basis of single‐crystal X‐ray diffraction data collected at room temperature. The title compound crystallizes in the orthorhombic α‐PbCl 2 ‐type structure with the lattice parameters a = 637.6(3) pm, b = 384.4(2) pm, and c = 703.1(3) pm. The praseodymium ion is ninefold coordinated, the oxygen ions show either tetrahedral or square‐pyramidal coordination spheres.