CaO-As2O5-H2O System at 23°± 1°C

The phase diagram for the ternary system CaO‐As2O5‐H2O at 23°± 1°C is plotted. The calcium arsenates represented are Ca(H2AsO4)2, CaHAsO4·H2O, Ca5H2(AsO4)4·9H2O, Ca3(AsO4)2·xH2O (x= 3⅔ and 4¼), Ca5(AsO4)3OH (apatite), and Ca4(OH)2(AsO4)2·4H2O. The solubility data indicate the following invariant poi...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2002-01, Vol.85 (1), p.221-224
Main Authors: Jr. Bothe, James V., Brown, Paul W.
Format: Article
Language:English
Subjects:
arsenic/arsenic compounds
calcium oxide
Chemistry
Exact sciences and technology
General and physical chemistry
Others (including liquid-liquid-vapor equilibria)
Phase equilibria
water
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Summary:The phase diagram for the ternary system CaO‐As2O5‐H2O at 23°± 1°C is plotted. The calcium arsenates represented are Ca(H2AsO4)2, CaHAsO4·H2O, Ca5H2(AsO4)4·9H2O, Ca3(AsO4)2·xH2O (x= 3⅔ and 4¼), Ca5(AsO4)3OH (apatite), and Ca4(OH)2(AsO4)2·4H2O. The solubility data indicate the following invariant points: Ca(H2AsO4)2–CaHAsO4·H2O–solution, CaHAsO4·H2O–Ca5H2(AsO4)4·9H2O–solution, Ca5H2(AsO4)4·9H2O–Ca3(AsO4)2·4¼H2O–solution, Ca3(AsO4)2·3⅔H2O–Ca4(OH)2(AsO4)2·4H2O–solution, and Ca4(OH)2(AsO4)2·4H2O–Ca(OH)2–solution. The tricalcium arsenate Ca3(AsO4)2·3⅔H2O is shown to be the only hydrate to dissolve congruently.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.2002.tb00069.x