Mechanochemical effects on synthesis and properties of manganese–neodymium diphosphates

The mixtures of ammonium dihydrogenphosphate, manganese carbonate, and neodymium oxide in the mole ratios of P/(2Mn+3Nd)=1/2 and Mn/Nd=10/0, 9/1 and 8/2 were milled with planetary mill. The thermal behavior of milled samples was investigated with differential thermal analyses, X-ray diffraction, and Fourier transform infrared spectroscopy. Furthermore, thermal products were estimated by ultraviolet-visible reflectance spectra, particle size distribution, scanning electron micrograph, and the amount of adsorbed nitrogen gas. Since the mixed materials were activated as mechanochemical effects, Mn2P2O7 was formed at lower temperature. During mechanical treatment, the change of hue was observed at lower temperature and phosphates had a more vivid tone.