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Journal of Materials Science

, Volume 20, Issue 2, pp 449–456 | Cite as

Thermodynamic considerations of metal halide vapour complexes

  • D. S. McPhail
  • M. G. Hocking
  • J. H. E. Jeffes
Article

Abstract

Certain metal halide vapour complexes of the type ABX m+n increase the equilibrium vapour concentration of one or both of the component salts in the binary system (AXm/BXn). Such enhancement depends upon the free energy of complex formation, the saturated vapour pressure of the complexing salt and the melt activities, in a manner formulated here by means of a thermodynamic scheme. Certain trends in the periodic table are established.

Keywords

Polymer Free Energy Vapour Pressure Complex Formation Binary System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Nomenclature

ε

enhancement term=p0Ka

ε′

enhancement term=P0Ka

F

enhancement

p

partial vapour pressure (atm)

p0

saturated vapour pressure of monomer (atm)

P0

total saturated vapour pressure exerted by a salt (atm)

ρ

vapour concentration of a species

ρ0

vapour concentration of a species above the pure salt (mol m−3)

x

cation mole fraction

ΔHa

enthalpy of complex formation from monomers

ΔHb

vaporization enthalpy of AX m

ΔHc

vaporization enthalpy of BX n

ΔHd

vaporization enthalpy of ABX m+n

ΔHe

exchange enthalpy

ΔHm

enthalpy of mixing in liquid pool

ΔV

change in coulombic potential energy

Db

bridge bond strength

Dt

end bond strength

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Copyright information

© Chapman and Hall Ltd 1985

Authors and Affiliations

  • D. S. McPhail
    • 1
  • M. G. Hocking
    • 1
  • J. H. E. Jeffes
    • 1
  1. 1.Department of Metallurgy and Materials ScienceImperial CollegeLondonUK

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