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Thermodynamic Characterization of the Eutectic Phase Mixture NaNbO 3 /Na 3 NbO 4 . II: Solid‐State Electrochemical Investigation
Author(s) -
Näfe Helfried,
Amin Ruhul,
Aldinger Fritz
Publication year - 2007
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.1551-2916.2007.01860.x
Subject(s) - eutectic system , natural bond orbital , electrochemistry , characterization (materials science) , electrolyte , phase (matter) , oxide , galvanic cell , potentiometric titration , materials science , solid solution , thermodynamics , gibbs free energy , analytical chemistry (journal) , chemistry , electrode , microstructure , nanotechnology , metallurgy , computational chemistry , physics , density functional theory , chromatography , organic chemistry
The difference in the standard Gibbs‐free energies of NaNbO 3 and Na 3 NbO 4 has been determined by means of two electrochemical approaches based on potentiometric solid oxide electrolyte galvanic cells. The results are consistent with each other and prove the phase equilibrium between the niobates to be univariant. Quantitatively, the data can be represented by (525°–700°C)The results are in between a wide range spanned by estimated literature data and are close to the findings of a previous manometric study.