Abstract
The title compound (NH4)VOPO4, (1), was synthesized hydrothermally from a mixture of CsVO3, V, CH3PO3H2, (NH4)2HPO4, (C2H5)3CH3NBr, and H2O in the mole ratios 3.96:1:4.88:11.97:4.96:1498. Phosphate (1) crystallizes in the orthorhombic space group Pnn2 with a = 10.5119(2) Å, b = 12.917(3) Å, c = 6.462(1) Å, V = 877.3(4) Å, Z = 4, and R = 0.043. The framework consists of one-dimensional chains of corner-sharing VO6 octahedra joined together by phosphate tetrahedra which generates cation filled tunnels running parallel to the c axis, There are two unique vanadium sites, with the VO6 octahedra connected to their neighbors through alternating cis -O-V-O and trans-O-V-O linkages. At higher temperatures, the compound is paramagnetic with isolated V4+d1 centers while complicated, short range antiferromagnetism is observed below 10 K. The framework is closely related to that of KVOPO4.
Original language | English (US) |
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Pages (from-to) | 128-133 |
Number of pages | 6 |
Journal | Journal of Solid State Chemistry |
Volume | 108 |
Issue number | 1 |
DOIs | |
State | Published - Jan 1994 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry