Structural characterization of La2-xMxCuO4 (M = Sr,Ba) samples by synchrotron x-ray and neutron powder diffraction techniques

D. E. Cox, S. C. Moss, C. W. Chu

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

High-resolution synchrotron x-ray powder diffraction studies on samples of La2-xMx Cu04 (M = Sr,Ba) prepared by standard ceramic techniques show that macroscopic compositional inhomogeneities may exist that are unlikely to be revealed by conventional x-ray diffraction methods. Rietveld refinement of neutron data collected at 200, 50, and 11 K from one such sample, nominally La1.8 Sr0.2 Cu04, gave satisfactory fits to a tetragonal structure of K2NiF4 type at all three temperatures. However, careful individual peak fits revealed that part of the sample transforms to orthorhombic between 200 and 50 K. It is suggested that this multiphase character has an important influence on the superconducting properties.

Original languageEnglish
Pages (from-to)1327-1335
Number of pages9
JournalJournal of Materials Research
Volume3
Issue number6
DOIs
Publication statusPublished - 1988 Dec

All Science Journal Classification (ASJC) codes

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

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