Orthophosphates. Part VIII. The transformation of newberryite into bobierrite in aqueous alkaline solutions

E. J. Duff
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引用次数: 12

Abstract

Newberryite, MgHPO4,3H2O, was transformed in aqueous solutions of NaOH into bobierrite, Mg3(PO4)2,8H2O. A competing transformation in a solution which was 10–1M in both NaOH and NaF is the formation of magnesium fluoroapatite Mg5F(PO4)3. The nature of the reactions are discussed and ΔG°f values for Mg3(PO4)3,8H2O. MgHPO4,3H2O, Mg5F(PO4)3, Mg5OH(PO4)3, Mg(H2PO4)2, Mg(H2PO4)2,2H2O, Mg(H2PO4)2,4H2O, Mg4O(PO4)2, and Mg2F(PO4)2 have been calculated as –1302·7, –549·0, –1399·2. –1376·2, –652·5, –764·9, –878·2, –997·3 and –551·0 kcal mol–1 respectively. The nature of the stability relationships existing between the orthophosphate phases has been determined.
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分析。八世。在碱性水溶液中新贝里石向硼铁石的转变
Newberryite, MgHPO4,3H2O在NaOH水溶液中转化为bobierite, Mg3(PO4) 2,8h2o。在NaOH和NaF均为10-1M的溶液中,形成氟磷灰石Mg5F(PO4)3。讨论了反应的性质和Mg3(PO4) 3,8h2o的ΔG°f值。MgHPO4,3H2O, Mg5F(PO4)3, Mg5OH(PO4)3, Mg(H2PO4)2, Mg(H2PO4)2,2H2O, Mg(H2PO4)2,4H2O, Mg4O(PO4)2, Mg2F(PO4)2分别计算为-1302·7,-549·0,-1399·2。分别为-1376·2、-652·5、-764·9、-878·2、-997·3和-551·0 kcal mol-1。确定了正磷酸盐相之间存在的稳定性关系的性质。
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