Determination of thermodynamic properties of Ca4Fe9O17 by solid state EMF method

Aspiala, Markus, Hidayat, Taufiq, Taskinen, Pekka and Jak, Evgueni (2016) Determination of thermodynamic properties of Ca4Fe9O17 by solid state EMF method. Journal of Alloys and Compounds, 658 939-945. doi:10.1016/j.jallcom.2015.10.280

Author Aspiala, Markus
Hidayat, Taufiq
Taskinen, Pekka
Jak, Evgueni
Title Determination of thermodynamic properties of Ca4Fe9O17 by solid state EMF method
Journal name Journal of Alloys and Compounds   Check publisher's open access policy
ISSN 0925-8388
Publication date 2016-02-15
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.jallcom.2015.10.280
Open Access Status Not Open Access
Volume 658
Start page 939
End page 945
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2016
Language eng
Formatted abstract
In this study, thermodynamic properties of Ca4Fe9O17 have been measured by electrochemical cells of the type

(-)Pt, CaFe2O4 +Ca2Fe2O5 +Ca2Fe2O17|O2- electrolyte|O2, Pt(+)

with an improved experimental apparatus and the sample preparation procedure. The synthesis and heat treatment of the sample electrodes have been developed through a number of trials in order to produce dense and well equilibrated sample electrodes. The phase content of each sample electrode has been separately confirmed by microstructural analysis using secondary electron microscopy (SEM) and measurement of phase compositions using electron probe X-ray microanalysis (EPMA). The interaction between the sample electrode and zirconia electrolyte has been studied in order to optimize measurement procedure, by decreasing unwanted side reactions during the EMF measurements.

The standard thermodynamic quantities have been calculated from the measured EMF data involving standard Gibbs energy of formation of Ca4Fe9O17 as well as standard enthalpy. The obtained values have been compared with the thermodynamic functions available in the literature.
Keyword Ca-Fe-O system
Electromotive Force (EMF) technique
Gibbs energy of formation
Phase equilibrium
Standard thermodynamic properties
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2016 Collection
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