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Thermodynamic Properties of the System Indium‐Oxygen
Author(s) -
CHATTERJI D.,
VEST R. W.
Publication year - 1972
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.1151-2916.1972.tb13440.x
Subject(s) - standard molar entropy , enthalpy , galvanic cell , thermodynamics , gibbs free energy , standard enthalpy of formation , chemistry , indium , oxygen , electromotive force , emf measurement , oxide , partial pressure , analytical chemistry (journal) , physics , electrode , organic chemistry , quantum mechanics , electrolyte
The free‐energy change for the reaction 2In( l )+3NiO( s ) = In 2 O 3 ( s )+3Ni( s ) was determined from 550° to 800°C from emf measurements on solid‐oxide galvanic cells. The results were used to develop an equation for the standard molar free energy of formation of In 2 O 3 , i.e. ΔG° ln2O3 = ‐215,550+72.63 T ±450 cal/ mol. The standard molar enthalpy and entropy of formation of In 2 O 3 at 298°K were calculated to be ‐214,000±1500 cal/mol and ‐69.03±o0.22 eu, respectively, using the available thermo‐chemical data. The absolute entropy of In 2 O 3 at 298°K was calculated to be 32.23±0.22 eu. The free‐energy results of this study were used in conjunction with literature data to calculate partial pressures of the gaseous species over In 2 O 3 for different experimental conditions.