Defect structure and defect-induced expansion of undoped oxygen deficient perovskite LaCoO3-δ / Zuev A.Yu., Vylkov A.I., Petrov A.N., Tsvetkov D.S. // Solid State Ionics. - 2008. - V. 179, l. 33-34. - P. 1876-1879.

ISSN:

01672738

Type:

Article

Abstract:

The results of the isothermal expansion as a function of oxygen partial pressure pO2 and temperature are first presented for the perovskite-type undoped cobaltite LaCoO3-δ. The modeling of the chemical expansion of this oxygen deficient perovskite on the basis of its defect structure is carried out. The chemical expansion model based on the relative change of the mean ionic radius is evolved. Within the framework of the model electrons and electron holes are assumed to be localized on cobalt sites in LaCoO3-δ. The corresponding equations for the concentration of all ionic species depending on oxygen nonstoichiometry δ enable to derive a model expression, which is used for the computation of the LaCoO3-δ chemical expansion versus oxygen nonstoichiometry. The experimental data on the chemical expansion of LaCoO3-δ and those calculated on the basis of the model proposed are shown to coincide with each other very good. Such coincidence implies explicitly that the isothermal expansion of LaCoO3-δ observed with oxygen nonstoichiometry growth at given temperature is solely caused by the mean ionic radius increase. The latter occurs due to the partial substitution of "large" Co(n - 1)+ cation for smaller Con+ cation as a result of the reduction. On the other hand, aforementioned agreement can be regarded as an additional evidence of the localized nature of the electronic defects in the undoped lanthanum cobaltite. © 2008 Elsevier B.V. All rights reserved.

Author keywords:

Chemical expansion; Defect structure; Defect-induced expansion; Dilatometry; Lanthanum cobaltite; Oxygen nonstoichiometry

Index keywords:

Cobalt; Concentration (process); Defects; Expansion; Ionic conduction in solids; Lanthanum; Lanthanum alloys; Nonmetals; Oxide minerals; Oxygen; Perovskite; Positive ions; Transition metals; Chemical

DOI:

10.1016/j.ssi.2008.06.001

Смотреть в Scopus:

https://www.scopus.com/inward/record.uri?eid=2-s2.0-56049110525&doi=10.1016%2fj.ssi.2008.06.001&partnerID=40&md5=e8fa697325e5558cebb289e3b264f5b2

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Поле	Значение
Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-56049110525&doi=10.1016%2fj.ssi.2008.06.001&partnerID=40&md5=e8fa697325e5558cebb289e3b264f5b2
Affiliations	Department of Chemistry, Ural State University, Lenin av.51, 620083 Yekaterinburg, Russian Federation
Author Keywords	Chemical expansion; Defect structure; Defect-induced expansion; Dilatometry; Lanthanum cobaltite; Oxygen nonstoichiometry
References	Minh, N.Q., (1993) J. Am. Ceram. Soc., 76, p. 563; Hartley, A., Sahibzada, M., Weston, M., Metcalfe, I.S., Mantzavinos, D., (2000) Catal. Today, 55, p. 197; Armstrong, T.R., Stevenson, J.W., Pederson, L.R., Raney, P.E., (1996) J. Electrochem. Soc., 143, p. 2919; Larsen, P.H., Hendriksen, P.V., Mogensen, M., (1997) J. Therm. Anal., 49, p. 1263; Adler, S.B., (2001) J. Am. Ceram. Soc, 84, p. 2117; Stevenson, J.W., Armstrong, T.R., Pederson, L.R., Weber, W.J., (1995) The First International Symposium on Ceramic Membranes, The Electrochemical Society Proceedings Series, Pennington, NJ, p. 94. , Anderson H.U., Khandkar A.C., and Liu M. (Eds) PV 95-24; Zuev, A., Singheiser, L., Hilpert, K., (2002) Solid State Ionics, 147, p. 1; Hilpert, K., Steinbrech, R.W., Boroomand, F., Wessel, E., Meschke, F., Zuev, A., Teller, O., Singheiser, L., (2003) J. Eur. Ceram. Soc., 23, p. 3009; Miyoshi, S., Hong, J.-O., Yashiro, K., Kaimai, A., Nigara, Y., Kawamura, K., Kawada, T., Mizusaki, J., (2003) Solid State Ionics, 16, p. 209; Kharton, V.V., Yaremchenko, A.A., Patrakeev, M.V., Naumovich, E.N., Marques, F.M.B., (2003) J. Eur. Ceram. Soc., 23, p. 1417; Chen, X., Yu, J., Adler, S.B., (2005) Chem. Mater., 17, p. 4537; Atkinson, A., Ramos, T.M.G.M., (2000) Solid State Ionics, 129, p. 259; Burgermeister, A., Benisek, A., Sitte, W., (2004) Solid State Ionics, 170, p. 99; Zuev, A.Yu., Petrov, A.N., Vylkov, A.I., Tsvetkov, D.S., (2007) J. Mater. Sci., 42, p. 1901; Petrov, A.N., Cherepanov, V.A., Zuev, A.Yu., (2006) J. Solid State Electrochem., 10, p. 517; Shannon, R.D., (1976) Acta Crystallogr., A32, p. 751
Correspondence Address	Zuev, A.Yu.; Department of Chemistry, Ural State University, Lenin av.51, 620083 Yekaterinburg, Russian Federation; email: andrew.zuev@usu.ru
CODEN	SSIOD
Language of Original Document	English
Abbreviated Source Title	Solid State Ionics
Source	Scopus