caa a22 4500 463223101 CHVBK 20180405153218.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10853-006-0345-8 doi (NATIONALLICENCE)springer-10.1007/s10853-006-0345-8 Oxygen nonstoichiometry and defect structure of undoped and doped lanthanum cobaltites [Elektronische Daten] [A. Zuev, A. Petrov, A. Vylkov, D. Tsvetkov] The results of oxygen nonstoichiometry are presented for the perovskite-type undoped cobaltite LaCoO3-δ, doped with strontium La0.7Sr0.3CoO3-δ, and doped with copper LaCo0.7Cu0.3O3-δ as a function of oxygen partial pressure $${p_{\rm {O_2}}}$$ and temperature. The modeling of the defect structure of these oxygen deficient perovskites is carried out. Two different defect structure models are evolved. Within the framework of the first model electrons are treated as quasi-free in LaCoO3-δ, partly trapped in La0.7Sr0.3CoO3-δ and LaCo0.7Cu0.3O3-δ, whereas holes are assumed to be itinerant in all oxides studied. The intrinsic electronic disordering process is taken into account as well. According to the second model electrons and holes are assumed to be localized. Thermal excited charge disproportionation of cobalt is considered as well. The corresponding equations for the law of mass action, electroneutrality condition, and mass balance give a set of nonlinear equations in the both cases. The analytical solutions of these sets yield general expressions which are used for the verification of the defect models proposed by nonlinear curve fitting. The latter showed that both models of the defect structure of all lanthanum cobaltites studied fit the experimental data about equally good. It is, therefore, difficult to rule out either of defect structure models on the basis of equilibrium data on oxygen nonstoichiometry solely. Springer Science+Business Media, LLC, 2007 Zuev A. Chemical Department, Ural State University, Lenin Av.51, 620083, Yekaterinburg, Russia aut Petrov A. Chemical Department, Ural State University, Lenin Av.51, 620083, Yekaterinburg, Russia aut Vylkov A. Chemical Department, Ural State University, Lenin Av.51, 620083, Yekaterinburg, Russia aut Tsvetkov D. Chemical Department, Ural State University, Lenin Av.51, 620083, Yekaterinburg, Russia aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/6(2007-03-01), 1901-1908 0022-2461 42:6<1901 2007 42 10853 https://doi.org/10.1007/s10853-006-0345-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0345-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zuev A. Chemical Department, Ural State University, Lenin Av.51, 620083, Yekaterinburg, Russia aut NATIONALLICENCE 700 1- Petrov A. Chemical Department, Ural State University, Lenin Av.51, 620083, Yekaterinburg, Russia aut NATIONALLICENCE 700 1- Vylkov A. Chemical Department, Ural State University, Lenin Av.51, 620083, Yekaterinburg, Russia aut NATIONALLICENCE 700 1- Tsvetkov D. Chemical Department, Ural State University, Lenin Av.51, 620083, Yekaterinburg, Russia aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/6(2007-03-01), 1901-1908 0022-2461 42:6<1901 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 457253304 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer