NDLI: Oxygen excess nonstoichiometry and thermodynamic quantities of La2NiO4 + δ

Content Provider	Springer Nature Link
Author	Jeon, S. Y. Choi, M. B. Hwang, J. H. Wachsman, E. D. Song, Sun Ju
Copyright Year	2011
Abstract	The oxygen excess nonstoichiometry of La2NiO4 + δ is measured as a function of temperature and oxygen partial pressure (pO2) by coulometric titration method. A positive deviation from the ideal dilution solution behavior is exhibited, and the partial molar thermodynamic quantities of La2NiO4 + δ are calculated from the Gibbs–Helmholtz equation for regular solution by introducing the activity coefficient of the charge carriers. The activity coefficient of holes is successfully calculated by using the Joyce–Dixon approximation of the Fermi–Dirac integral. The effective mass of holes ( $$ m_{\text{h}}^{{*}} $$ ) is 1.27–1.29 times the rest mass (m h), which indicate the action of band-like conduction and allow the effect of the small degree of polaron hopping to be ignored. The activity coefficient of holes calculated against the oxygen nonstoichiometry clearly illustrates the early positive deviation of the activity coefficient of holes from unit, leading to $$ \gamma_{{{\text{h}}^{ \bullet }}} $$ ≈ 14 at δ ≈ 0.08, which is quite close to the literature value of $$ \gamma_{{{\text{h}}^{ \bullet }}} $$ ≈ 10 at δ ≈ 0.08. All the evaluated thermodynamic quantities are in good agreement with the experimental literature values.
Starting Page	785
Ending Page	793
Page Count	9
File Format	PDF
ISSN	14328488
Journal	Journal of Solid State Electrochemistry
Volume Number	16
Issue Number	2
e-ISSN	14330768
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-05-20
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Oxygen nonstoichiometry Activity coefficient Hole degeneracy Energy Storage Physical Chemistry Analytical Chemistry Condensed Matter Physics Characterization and Evaluation of Materials Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science Electrical and Electronic Engineering Electrochemistry

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