Structural and magnetic characterisation of Aurivillius material Bi2Sr2Nb2.5Fe0.5O12

McCabe, E.E. and Greaves, C. (2008) Structural and magnetic characterisation of Aurivillius material Bi2Sr2Nb2.5Fe0.5O12. Journal of Solid State Chemistry, 181 (11). pp. 3051-3056. ISSN 00224596 (ISSN). (doi:https://doi.org/10.1016/j.jssc.2008.08.004) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://www.scopus.com/inward/record.url?eid=2-s2.0...

Abstract

The n=3 Aurivillius material Bi2Sr2Nb2.5Fe0.5O12 is investigated and combined structural refinements using neutron powder diffraction (NPD) and X-ray powder diffraction data (XRPD) data reveal that the material adopts a disordered, tetragonal (I4/mmm) structure at temperatures down to 2 K. Significant ordering of Fe3+ and Nb5+ over the two B sites is observed and possible driving forces for this ordering are discussed. Some disorder of Sr2+ and Bi3+ over the M and A sites is found and is consistent with relieving strain due to size mismatch. Highly anisotropic thermal parameters for some oxygen sites suggest that the local structure may be slightly distorted with some rotation of the octahedra. Magnetic measurements show that the material behaves as a Curie-Weiss paramagnet in the temperature range studied with no evidence of any long-range magnetic interactions. Solid solutions including Bi3-xSrxNb2FeO12, Bi2Sr2-xLaxNb2FeO12 and Bi2Sr2Nb3-xFexO12 were investigated but single-phase materials were only successfully synthesised for a narrow composition range in the Bi2Sr2Nb3-xFexO12 system. © 2008 Elsevier Inc. All rights reserved.

Item Type: Article
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - J. Solid State Chem. [Field not mapped to EPrints] AD - School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Aurivillius materials, Rietveld refinement
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QC Physics > QC176 Solid state physics
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Emma McCabe
Date Deposited: 10 Apr 2015 09:27 UTC
Last Modified: 10 Apr 2015 09:42 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/47934 (The current URI for this page, for reference purposes)
  • Depositors only (login required):