Preparation and properties of the micro- powder phase and a new phase of ammonium tetramolybdates

摘要

the micro-powder phase and a new phase of ammonium tetramolybdate were prepared using polyhase ammonium molybdate as the starting material. Their chemical properties were studied by XRD, TG, DSC and chemical quantitative analyses. It was discovered that the composition of the new phase is (NH_4)_2Mo_4O_13 and it transform to the micro-powder phase when heated below 280 deg.C.