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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/3570

Title: Determination of standard molar Gibbs free energy of formation of Bi2O3 over a wide temperature range by EMF method
Authors: GANESAN, R
GNANASEKARAN, T
SRINIVASA, RS
Keywords: zirconia electrolyte
bismuth sesquioxide
bi alloys
oxygen
system
oxide
transformations
state
Issue Date: 2003
Publisher: ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD
Citation: JOURNAL OF CHEMICAL THERMODYNAMICS, 35(10), 1703-1716
Abstract: The EMF of the following galvanic cells W, Bi, Bi2O3\CSZ\O-2 (1 atm), RuO2, Pt (I) W, Bi, Bi2O3\CSZ\O-2 (1 atm), Pt (II) were measured over a wide range of temperature (572 to 1127) K. With 02 (1 atm) reference and RuO2 as the electrode material with Pt as electrical lead, measurements were possible at temperatures close to the melting temperature of Bi. Standard Gibbs free energies of formation, Delta(f)G(m)(0) of Bi2O3(S) (both alpha and delta phases) and Bi2O3(l) were calculated from the emf measurements and are given by the following expressions: Delta(f)G(m)(0)(alpha-Bi2O3) +/- 0.3 kJ (.) mol(-1) = -583.4 + 0.2938T/K (572 less than or equal to T less than or equal to 988 K), Delta(f)G(m)(0)(delta-Bi2O3) +/- 0.4 kJ (.) mol(-1) = -543.8 + 0.2538T/K (988 less than or equal to T less than or equal to 1098 K), Delta(f)G(m)(0) (Bi2O3) +/- 0.3. kJ (.) mol(-1) = -492.4 + 0.2070T/K (1098 less than or equal to T less than or equal to 1127 K). A third law treatment of the data yielded a value of -568.4 +/- 0.5 kJ (.) mol(-1) for the enthalpy of formation of Bi2O3(s) at T = 298.15 K, Delta(f)H(m)(298.15 K)(0)(alpha-Bi2O3), which is in good agreement with the second law estimate of -570.8 +/- 0.3 kJ (.) mol(-1). (C) 2003
URI: http://dx.doi.org/10.1016/S0021-9614(03)00158-7
http://dspace.library.iitb.ac.in/xmlui/handle/10054/3570
http://hdl.handle.net/10054/3570
ISSN: 0021-9614
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