MECHANOCHEMICAL EFFECTS ON THE REACTIVITY OF Ni₃(PO₄)_2-(NH₄)₂HPO_4-M₂CO₃ (M: ALKALINE METAL) MIXTURE

Abstract

Influence of mechanochemical effects on the formation and property of MNiPO₄ (M: alkaline metal) was examined by using XRD, DTA-TG, UV-VIS, and so on. Starting mixtures were ground with grinding mill. The samples were calcined to synthesize MNiPO₄ compounds. Amorphous phase was observed in all ground samples, although mechanochemical reaction occurred partly in some ground samples. When the ground samples were heated, these crystallization temperatures were lower than those of unground samples. The intensities of XRD peaks of MNiP_O 4 produced from ground samples were stronger than those of unground samples, too. From the result of UV-VIS, mechanochemical treatment was more effective in the case of synthesizing MNiPO₄ as pigments.