Microstructure of La1-XCaxMnO3 studied by transmission electron microscopy

Q. Chen, J. Tao, J. M. Zuo, John Spence

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Microstructures of La1-xCaxMnO3 compounds (x = 1/3 and 0.5) prepared with and without intermediate grinding were studied using transmission electron microscopy. A high density of antiphase boundaries (APBs) with displacement vector 1/2〈111〉, indexed in orthorhombic unit cell, has been observed in bulk samples with no or minimum intermediate grinding. The nature of this APB is analyzed and found to be due to the symmetry breaking introduced by the tilting of MnO6 octahedra relative to the ideal perovskite structure. Samples prepared using two intermediate grinds do not show these defects indicating that the microstructure can be controlled through synthesis routes. The effect of domain boundaries on the colossal magnetoresistance effect is discussed.

Original languageEnglish (US)
Pages (from-to)2959-2965
Number of pages7
JournalJournal of Materials Research
Volume16
Issue number10
DOIs
StatePublished - Oct 2001

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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