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The crystal structure of (CH 3 ) 3  NHBF  4  was studied in three solid phases by X-ray diffraction techniques. The structures of the ionic plastic phase (Phase I) stable above 453 K and Phase II between 384 and 453 K are CsCl-type cubic ( a  = 5.772(4) Å) and tetragonal ( a  = 9.815(5) and  c  = 6.895(5) Å), respectively. The room temperature phase (Phase III) forms a monoclinic lattice (space group P2 1 /m,  a  = 5.7017(8),  b  = 8.5724(9),  c  = 7.444(1) Å, and ß = 102.76(1)°). BF 4  −  ions in this phase were shown to be disordered in four orientations.

Crystal Structure of Trimethylammonium Tetrafluoroborate in Three Solid Phases