Phase behavior of lanthanum strontium manganites

Feng Zheng, Larry R. Pederson

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56 Citations (Scopus)

Abstract

The phase stability of Sr-doped LaMnO3 (LSM) perovskite in the La-Sr-Mn-O system was investigated as a function of Sr content and A/B cation ratio. The perovskite structure changed with both Sr content and A/B cation ratio. As the Sr content was increased to 0.2 mol, the perovskite structure adopted an orthorhombic distortion. This changed to a monoclinic or hexagonal structure for 0.2 ≤ Sr ≤ 0.3 mol. When the Sr content increased to 0.3 mol, the structure reverted to orthorhombic symmetry. Data from X-ray powder diffractometry, scanning electron microscopy, transmission electron microscopy, and energy-dispersive X-ray emission spectroscopy, showed that secondary phases in the La-Sr-Mn-O system were underdeveloped with respect to changes of the doped Sr content, A/B cation ratio, and thermal history. X-ray detectable minor phases present in the LSM material were Mn3O4, (La, Sr)Mn2O4, La2)3 La(OH)3, (La, Sr)3Mn2O7, and (La, Sr)2MnO4.

Original languageEnglish
Pages (from-to)2810-2816
Number of pages7
JournalJournal of the Electrochemical Society
Volume146
Issue number8
DOIs
Publication statusPublished - Aug 1999
Externally publishedYes

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ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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