Sodium Phosphate Solubility and Phase Relations Basis for Invariant Point Chemistry Control
1975; Institute of Physics; Volume: 122; Issue: 7 Linguagem: Inglês
10.1149/1.2134369
ISSN1945-7111
AutoresA. J. Panson, G. Economy, Chia-Tsun Liu, T. S. Bulischeck, W. T. Lindsay,
Tópico(s)Crystallization and Solubility Studies
ResumoA study of sodium phosphate solubility and phase relations was made in the temperature region of 300°C. A sharp retrograde temperature dependence of solubility was observed for disodium phosphate solutions. Solubility at constant temperature is strongly dependent on the composition of the solution. A solid precipitates incongruently from solutions that have ratios from 2.13 to 1.6. A high‐ratio solid phase precipitates incongruently from solutions with above 2.13, which corresponds to an invariant or "drying‐up" point in the system. Both solid phases have a range of variable composition, indicating that they are solid solutions. The effects of concentration and dry‐up in localized zones are discussed in terms of this new information. The work shows that chemistry variations can be controlled by maintaining solution composition above the invariant point in the phase diagram.
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