Pecularities of lanthanum phosphate formation in molten phosphate-molybdate melts
DOI:
https://doi.org/10.15407/dopovidi2022.05.087Keywords:
lanthanum, molybdate, vanadate, glass structure, meltAbstract
It is established that the nature of crystal formation in the melts of the K–P–Mo–La–O–F system is determined by the ratio K/Mo and P/Mo. Crystallization fields of framework LaPO4 and K3La(PO4)2 with arcanite structure have been established. It is shown that the key factor in the formation of complex oxide compounds of rare earth elements from combined molybdate-phosphate melts is the K/Mo ratio in the initial solution — melt: at K/Mo = 0. 5 ÷ 1. 0 LnPO4 orthophosphates are formed, characterized by a framework structure of on LnO7/LnO8; and at K/Mo = 1. 5 ÷ 2. 5, double orthophosphates of the composition K3Ln(PO4)2 with an island structure are formed.
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