Oxygen nonstoichiometry, defect structure and defect-induced expansion of undoped perovskite LaMnO3 ± δ / Zuev A.Yu., Tsvetkov D.S. // Solid State Ionics. - 2010. - V. 181, l. 11-12. - P. 557-563.

ISSN:

01672738

Type:

Article

Abstract:

The results of oxygen nonstoichiometry, δ, as well as chemical expansion as functions of oxygen partial pressure pO2 and temperature are presented for the perovskite-type undoped manganite LaMnO3 ± δ. The modeling of the defect structure of this perovskite is carried out in both deficit and excess oxygen regions. Within the framework of the model electrons and electron holes are assumed to be localized on manganese sites in LaMnO3 ± δ. Defect structure models proposed are shown to fit perfectly well the experimental data on oxygen nonstoichiometry of LaMnO3 ± δ. Equilibrium constants of the appropriate defect reactions are, therefore, determined. As a consequence, concentrations of all defect species defined within the frameworks of the model proposed are calculated as functions of temperature and oxygen nonstoichiometry. These dependences are employed in the chemical expansion model derived by us earlier and based on the relative change of the mean ionic radius in order to compute the LaMnO3 - δ chemical expansion versus oxygen nonstoichiometry. The experimental data on the chemical expansion of LaMnO3 - δ and those calculated on the basis of the model proposed are shown to coincide with each other very good. Such coincidence implies obviously that the isothermal expansion of LaMnO3 - δ observed with small deviation from its stoichiometric composition with respect to oxygen at given temperature is solely caused by the mean ionic radius increase. © 2010 Elsevier B.V. All rights reserved.

Author keywords:

Chemical expansion; Defect structure; Defect-induced expansion; Lanthanum manganite; Oxygen nonstoichiometry

Index keywords:

Chemical expansion; Defect reactions; Defect species; Electron hole; Excess oxygen; Experimental data; Ionic radius; Isothermal expansion; Lanthanum manganites; Oxygen non-stoichiometry; Oxygen partia

DOI:

10.1016/j.ssi.2010.02.024

Смотреть в Scopus:

https://www.scopus.com/inward/record.uri?eid=2-s2.0-77950521367&doi=10.1016%2fj.ssi.2010.02.024&partnerID=40&md5=e6d44e13fcee826e79da854f18367d42

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Другие поля

Поле	Значение
Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-77950521367&doi=10.1016%2fj.ssi.2010.02.024&partnerID=40&md5=e6d44e13fcee826e79da854f18367d42
Affiliations	Department of Chemistry, Ural State University, Lenin av.51, 620083 Ekaterinburg, Russian Federation
Author Keywords	Chemical expansion; Defect structure; Defect-induced expansion; Lanthanum manganite; Oxygen nonstoichiometry
References	Cherepanov, V.A., Petrov, A.N., Zuev, A.Yu., (2009) Solid State Electrochemistry I: Materials and Their Applications, p. 43. , Kharton V.V. (Ed), WILEY-VCH, Weinheim; Kamata, K., Nakajima, T., Hayashi, T., Nakamura, T., (1978) Material Research Bulletin, 13, p. 49; Kuo, H., Anderson, H.U., Sparlin, D.M., (1989) Journal Solid State Chemistry, 83, p. 52; Roosmalen, J.A.M., Cordfunke, E.H.P., (1991) Solid State Chemistry, 93, p. 212; van Roosmalen, J.A.M., Cordfunke, E.H.P., (1994) Journal Solid State Chemistry, 110, p. 109; van Roosmalen, J.A.M., Cordfunke, E.H.P., (1994) Journal Solid State Chemistry, 110, p. 113; Petrov, A.N., Zuev, A.Yu., Tikchonova, I.L., Voronin, V.I., (2000) Solid State Ionics, 129, p. 179; Mizusaki, J., Mori, N., Takai, H., (2000) Solid State Ionics, 129, p. 163; Nakamura, K., Ogawa, K., (2002) Journal Solid State Chemistry, 163, p. 65; Nowotny, J., Rekas, M., (1998) Journal American Ceramic Society, 81, p. 67; Zuev, A.Yu., Petrov, A.N., Vylkov, A.I., Tsvetkov, D.S., (2007) Journal Material Science, 42, p. 1901; Miyoshi, S., Hong, J.-O., Yashiro, K., (2003) Solid State Ionics, 161, p. 209; Tsvetkov, D.S., Sereda, V.V., Zuev, A.Yu., (2010) Solid State Ionics, 180, p. 1620; Zuev, A.Yu., Vylkov, A.I., Petrov, A.N., Tsvetkov, D.S., (2008) Solid State Ionics, 179, p. 1876; Shannon, R.D., (1976) Acta Crystallographica Section A, Foundations of Crystallography, A32, p. 751; Hilpert, K., Steinbrech, R.W., Boroomand, F., (2003) Journal European Ceramic Society, 23, p. 3009; Boroomand, F., Wessel, E., Bausinger, H., Hilpert, K., (2000) Solid State Ionics, 129, p. 251; Zuev, A., Singheiser, L., Hilpert, K., (2002) Solid State Ionics, 147, p. 1
Correspondence Address	Zuev, A.Yu.; Department of Chemistry, Ural State University, Lenin av.51, 620083 Ekaterinburg, Russian Federation; email: andrew.zuev@usu.ru
CODEN	SSIOD
Language of Original Document	English
Abbreviated Source Title	Solid State Ionics
Source	Scopus