Structural effects of cation size variance in magnetoresistive manganese oxide perovskites

Authors
Rodriguez-Martinez, LM Attfield, JP
Citation
Lm. Rodriguez-martinez et Jp. Attfield, Structural effects of cation size variance in magnetoresistive manganese oxide perovskites, CHEM MATER, 11(6), 1999, pp. 1504-1509
Citations number
35
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
CHEMISTRY OF MATERIALS
ISSN journal
08974756 → ACNP
Volume
11
Issue
6
Year of publication
1999
Pages
1504 - 1509
Database
ISI
SICI code
0897-4756(199906)11:6<1504:SEOCSV>2.0.ZU;2-4
Abstract
The structures of La0.7Ca0.11Sr0.19MnO3, La0.32Pr0.38Sr0.3MnO3, Pr(0.)7Sr(0 .23)Ba(0.07)MnO(3). and Nd0.7Sr0.16Ba0.14MnO3 have been refined from 4 K po wder neutron diffraction data. These samples have all the same doping level and mean A cation size radius, but the A cation size variance sigma(2) inc reases across the series. Cell parameters and coherent and incoherent atomi c displacements all change systematically with sigma(2). The largest change s to the MnO3 framework are in the incoherent structure, and we conclude th at these are responsible for the strong linear depression of the metal-insu lator transition temperature by sigma(2).