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Formation of a real structure of perovskites (La1−x , Sr x )CoO3−δ in the region of the morphotropic phase transition

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Abstract

Precision X-ray diffractometry with synchrotron radiation and transmission electron microscopy are used to show that the extent of hexagonal distortion of the perovskite cell of the (La1−x, Sr x )CoO3−δ system decreases and the microstructure of the samples changes when La is substituted by Sr; these changes are due to increased microstrains in the structure and subsequent formation of microunits. The microunit structure of particles in the region of the morphotropic transition 0.3≤x≤0.4, which is a consequence of the metastable state of the system, may be the reason for the high catalytic activity of the samples which we found previously.

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Authors
  1. S. V. Tsybulya
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  2. G. N. Kryukova
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  3. L. A. Isupova
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  4. A. N. Shmakov
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  5. S. V. Cherepanova
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  6. V. A. Sadykov
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Additional information

G. K. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences. Translated fromZhurnal Strukturnoi Khimii, Vol. 39, No. 1, pp. 92–97, January–February, 1998.

This work was supported by RFFR grants 96-03-33103 and 97-03-33497.

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Tsybulya, S.V., Kryukova, G.N., Isupova, L.A. et al. Formation of a real structure of perovskites (La1−x , Sr x )CoO3−δ in the region of the morphotropic phase transition. J Struct Chem 39, 75–79 (1998). https://doi.org/10.1007/BF02873828

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  • DOI: https://doi.org/10.1007/BF02873828

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