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(NH 4 ) 2 [MoO 4 ] ( mS 60) undergoes on cooling a phase transition at 190 K. The investigation of this phase transition by means of time and temperature resolved X-ray powder diffraction showed that the phase transition appears on heating at a temperature of 250 K. From this hysteresis and the abrupt changes in the peak positions of the diffractograms it is assumed that this is a first order transition. A diffractogram of the low temperature modification was recorded between 10° and 100° in 2 θ . The structure was determined using direct methods and was refined by Rietveld methods. The low temperature modification of (NH 4 ) 2 [MoO 4 ] ( mP 60,  P 2 1 / a ) crystallizes in space group  P 2 1 / a  (No. 14) and lattice constants  a  = 767.57(5) pm,  b  = 1120.53(7) pm,  c  = 712.64(4) pm and  β  = 115.727(2)°.

Phase transformation of ammonium monomolybdate. The structure of the low temperature modification, (NH 4 ) 2 [MoO 4 ] ( mP 60, P 2 1 / a )