F3 H4 Mn N Laguna M, Sanjuan M, Orera V, Rubin J, Palacios E, Pique M, Bartolome J, Berar J Journal of Physics: Condensed Matter 5 (1993) 283-300 X-ray and raman study of the low temperature NH4MnF3 structure;evidence of librational motion of the NH4^+^ ion _cod_database_code 1008535 _database_code_amcsd 0016428 5.952 8.543 5.949 90 90 90 Pnma atom x y z N1 .5 .25 0 Mn1 0 0 0 F1 .278 .014 .761 F2 0 .25 .019