Structural effects of Sr substitution

P. Heaney, A. Mehta

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Structures within the (Formula presented) system (Formula presented) were refined by Rietveld analysis of powder x-ray-diffraction data. Our results reveal three distinct regimes that parallel energetic transformations within the series. For (Formula presented) enthalpies of oxidation are strongly exothermic and the compounds are monophasic and orthorhombic. Hole saturation occurs for (Formula presented) and the symmetry decreases from orthorhombic to monoclinic. For (Formula presented) diffraction patterns suggest phase immiscibility between a Sr-poor, hole-saturated compound and a Sr-rich phase for which oxidation is strongly favored. Fourier synthesis maps for all compositions revealed evidence for microtwinning and positional disorder among apical oxygen atoms.

Original languageEnglish (US)
Pages (from-to)10370-10378
Number of pages9
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume57
Issue number17
DOIs
StatePublished - 1998

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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