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Structure, stoichiometry and phase purity of strontium-doped lanthanum manganite powders

✍ Scribed by R. Millini; M. F. Gagliardi; G. Piro

Publisher
Springer
Year
1994
Tongue
English
Weight
390 KB
Volume
29
Category
Article
ISSN
0022-2461

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✦ Synopsis

Strontium-doped lanthanum manganite Lal-xSrxMnOa (LSM) is characterized by hexagonal-rhombohedral distorted perovskite-type structure, deriving from the ideal cubic symmetry through rotation of the [MnO6] octahedra around the ternary axis. The extent of distortion and unit cell volume depend on Sr content. The linear variation of the unit cell volume, observed in the compositional range 0.1 ~< x ~< 0.5, can be effectively used for determining the stoichiometry of LSM. A procedure for the quantitative analysis of segregated impurities (La203 and Mn304) based on X-ray powder diffraction analysis, has also been developed.

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