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Crystal structure and physicochemical properties of doped lanthanum manganites

Russian Journal of Physical Chemistry A, ISSN: 0036-0244, Vol: 86, Issue: 12, Page: 1862-1868
2012
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Substituted lanthanum-strontium manganites La Sr Mn Me ± δ (Me = Ti, Cr, Fe, and Cu) are obtained by standard ceramic and glycerin-nitrate techniques. High-temperature powder X-ray diffraction is employed to study the crystal structure of La Sr Mn Me ± δ oxides. It is shown that in the range 298-1023 K in air, La Sr Mn Me ± δ manganites crystallized in an orthorhombic cell (space group R-3c). The isobaric temperature dependences of unit cell parameters are determined. Thermal expansion coefficients are calculated for La Sr Mn Me ± δ oxides. The conductivity of La Sr Mn Me ± δ is studied as a function of temperature in the range 500 K ≥ T ≥ 1200 K in air. It is shown that substituting 3d metal for manganese considerably lowers the conductivity of basic La0.7Sr0.3Mn0.9O ± δ. The chemical stability of iron-substituted manganite La Sr Mn Fe ± δ is studied with respect to the electrolyte material. © Pleiades Publishing, Ltd., 2012.

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