The Special Features of the Crystal Structure and Properties
of Oxides with Mixed Conductivity Based on Lanthanum Gallate

E. D. Politova^a, S. A. Ivanov^a, G. M. Kaleva^a, A. V. Mosunov^a, and V. S. Rusakov^b

^a Karpov Research Institute of Physical Chemistry, ul. Vorontsovo pole 10, Moscow, 105064 Russia

^b Faculty of Physics, Moscow State University, Moscow, 119992 Russia

e-mail: politova@cc.nifhi.ac.ru

Received January 31, 2008

Abstract—The paper presents a review of works on the synthesis, structural composition effects, phase transi-
tions, and electrical conductivity properties of multicomponent solid solutions based on heterosubstituted lan-
thanum gallate (La,A)(Ga,M)O_3–y. High-temperature phase transitions and structural and charge ordering
effects were studied. The presence of iron cations in different valence states was proved; the relative contents
of these cations depended on the x parameter and nonstoichiometry parameter y of the base composition. For
M = Fe, antiferromagnetic ordering was observed; its temperature interval was determined by the concentration
of iron cations in the high-spin state. The total conductivity was found to increase as the concentration of tran-
sition metal cations grew because of an increase in the electronic conductivity component. The data on struc-
tural parameters and dc and ac conductivity substantiated the conclusion that the highest ionic conductivity and
permeability to oxygen were characteristic of iron-containing oxides. The results obtained are evidence that
crystal chemical factors play a determining role in the formation of the ion-conducting properties of anion-defi-
cient perovskite-like oxides.

DOI: 10.1134/S003602440810004X

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