Orientational disorder and phase transitions in ammonium oxofluorovanadates, (NH4)(3)VOF5 and (NH4)(3)VO2F4

Udovenko, AA; Pogoreltsev, EI; Marchenko, YV; Laptash, NM ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE CRYSTAL ENGINEERING AND MATERIALS, 73 1085-1094; 10.1107/S2052520617012422 6 DEC 2017