Authors
Citation
Ew. Dewing, THERMODYNAMICS OF THE SYSTEM NAF-ALF3 - PART VII - NONSTOICHIOMETRIC SOLID CRYOLITE, Metallurgical and materials transactions. B, Process metallurgy and materials processing science, 28(6), 1997, pp. 1095-1097
Citations number
13
Journal title
ISSN journal
10735615
Volume
28
Issue
6
Year of publication
1997
Pages
1095 - 1097
Database
ISI
SICI code
1073-5615(1997)28:6<1095:TOTSN->2.0.ZU;2-8
Abstract
Earlier data are recalculated to give the boundaries of the homogeneou
s field of solid cryolite. The equilibrium constant K = x(3) . (a(NaF)
)(2)/[18(1 - x/3)(2) . (1 - x/2)] where the composition of the materia
l is (3 - x)NaF . AlF3, is log(10) (K) = -12,543/T + 5.109 The activit
y of NaF, a(NaF), is referred to the solid standard state. The standar
d Gibbs energy of fusion of stoichiometric cryolite is Delta G degrees
/J = 119,331 - 94.695 T.