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The Iron‐Oxygen Equilibrium in Glass: Effect of Platinum on the Fe 2+ /Fe 3+ Equilibrium
Author(s) -
BAAK T.,
HORNYAK E. J.
Publication year - 1961
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1961.tb11654.x
Subject(s) - platinum , enthalpy , chemistry , chemical equilibrium , gibbs free energy , oxygen , standard enthalpy of formation , thermodynamic equilibrium , inorganic chemistry , thermodynamics , catalysis , organic chemistry , physics
A number of experiments were performed on iron‐containing sodium disilicate melts in air. It was found that it was not possible to obtain an equilibrium between Fe 2+ and Fe 3+ in platinum crucibles owing to the reaction between platinum and iron, whereas in alumina crucibles the equilibrium was rapidly established. Thermodynamic calculations of the reaction 2FeO (in Na 2 O‐2SiO 2 ) +½O 2 (g) = Fe 2 O 3 (in Na 2 O‐2SiO 2 ) showed that the equilibrium went more and more to the right with increasing temperature. The standard free energy, enthalpy, and entropy for the reaction were calculated.