Defect formation in LaGa (Mg,Ni) O3-δ: A statistical thermodynamic analysis validated by mixed conductivity and magnetic susceptibility measurements / Naumovich E.N., Kharton V.V., Yaremchenko A.A., Patrakeev M.V., Kellerman D.G., Logvinovich D.I., Kozhevnikov V.L. // Physical Review B - Condensed Matter and Materials Physics. - 2006. - V. 74, l. 6.

ISSN:

10980121

Type:

Article

Abstract:

A statistical thermodynamic approach to analyze defect thermodynamics in strongly nonideal solid solutions was proposed and validated by a case study focused on the oxygen intercalation processes in mixed-conducting La Ga0.65 Mg0.15 Ni0.20 O3-δ perovskite. The oxygen nonstoichiometry of Ni-doped lanthanum gallate, measured by coulometric titration and thermogravimetric analysis at 923-1223 K in the oxygen partial pressure range 5× 10-5 to 0.9 atm, indicates the coexistence of Ni2+, Ni3+, and Ni4+ oxidation states. The formation of tetravalent nickel was also confirmed by the magnetic susceptibility data at 77-600 K, and by the analysis of p -type electronic conductivity and Seebeck coefficient as function of the oxygen pressure at 1023-1223 K. The oxygen thermodynamics and the partial ionic and hole conductivities are strongly affected by the point-defect interactions, primarily the Coulombic repulsion between oxygen vacancies and/or electron holes and the vacancy association with Mg2+ cations. These factors can be analyzed by introducing the defect interaction energy in the concentration-dependent part of defect chemical potentials expressed by the discrete Fermi-Dirac distribution, and taking into account the probabilities of local configurations calculated via binomial distributions. © 2006 The American Physical Society.

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Index keywords:

нет данных

DOI:

10.1103/PhysRevB.74.064105

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-33747001822&doi=10.1103%2fPhysRevB.74.064105&partnerID=40&md5=f2f8573b1aa5faf6f069c6ef52b56431

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Art. No.	064105
Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-33747001822&doi=10.1103%2fPhysRevB.74.064105&partnerID=40&md5=f2f8573b1aa5faf6f069c6ef52b56431
Affiliations	Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal; Institute of Physicochemical Problems, Belarus State University, 14 Leningradskaya Strasse, 220050 Minsk, Belarus; Institute of Solid State Chemistry, Ural Division of RAS, 91 Pervomayskaya Strasse, 620219 Ekaterinburg, Russian Federation
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Correspondence Address	Kharton, V.V.; Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal; email: kharton@cv.ua.pt
CODEN	PRBMD
Language of Original Document	English
Abbreviated Source Title	Phys. Rev. B Condens. Matter Mater. Phys.
Source	Scopus