CRYSTALLIZATION OF CALCIUM AND MAGNESIUM PHOSPHATES FROM SOLUTIONS OF LOW CONCENTRATION

被引：63
|
作者：
ABBONA, F [1 ]
FRANCHINIANGELA, M [1 ]
机构：
[1] UNIV TURIN, DIPARTIMENTO SCI TERRA, I-10125 TURIN, ITALY
来源：
JOURNAL OF CRYSTAL GROWTH | 1990年 / 104卷 / 03期
关键词：
D O I：
10.1016/0022-0248(90)90009-A
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
The precipitation and evolution of calcium phosphates in solutions of low concentration ([Ca] = [P] = 0.005M) were studied at 25° C in the presence of magnesium the concentration of which ranged from 0.5mM to 50mM. The initial and final phases are described in terms of initial composition and pH of solutions. The first precipitating phase is an amorphous calcium phosphate, Ca3(PO4)2·nH2O, which transforms into apatite-like phosphate, Ca5(PO4)3OH, or whitlockite, Ca9MgH(PO4)7, or remains unaltered, according to the magnesium concentration. Brushite, CaHPO4·2H2O, dominates in the poorly supersaturated solutions. Octacalcium phosphate, Ca4H(PO4)3·2.5H2O, rarely occurs. The conditions for phase stability, and the role of magnesium and supersaturation are discussed. © 1990.
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收藏
页码：661 / 671
页数：11
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