Structural and magnetic characterisation of Bi2Sr 1.4La0.6Nb2MnO12 and its relationship to "Bi2Sr2Nb2MnO 12"

McCabe, E.E. and Greaves, C. (2005) Structural and magnetic characterisation of Bi2Sr 1.4La0.6Nb2MnO12 and its relationship to "Bi2Sr2Nb2MnO 12". Journal of Materials Chemistry, 15 (1). pp. 177-182. ISSN 09599428 (ISSN). (doi:https://doi.org/10.1039/b413732a) (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)

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Abstract

A new Aurivillius phase (generic formula M2An-IB nO3n+3) has been synthesized with n = 3 and containing manganese, Bi2Sr1.4La0.6Nb2MnO 12. The structure has been investigated by X-ray and neutron powder diffraction and found to be tetragonal (I4/mmm) at temperatures down to 2 K, with a= 3.89970(7) Ã?, c = 32.8073(9) Ã?at 2 K. There is significant cation disorder between Bi3+ (predominantly on the M sites) and Sr2+ and La3+ which prefer the A sites: 19(2)% of Bi 3+ occupy the A sites. This disorder, leading to occupancy of M sites by Sr2+, is thought to relieve strain due to size-mismatch between the fluorite-like and perovskite-like blocks. A high level of order exists between Mn and Nb on the B sites, with Mn located predominantly (76.1 (6)%) in the central B site whilst Nb preferentially occupies the lower symmetry, outer B site, where it undergoes an out-of-centre displacement towards the fluorite-like blocks. Magnetic measurements indicate that this material displays spin-glass behaviour on cooling. Synthesis of the Mn4+ analogue Bi2Sr2Nb2MnO12 was unsuccessful, possibly due to the small size of the Mn4+ cation.

Item Type: Article
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - J. Mater. Chem. [Field not mapped to EPrints] AD - School of Chemistry, University of Birmingham, Birmingham, B15 2TT, United Kingdom [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Cooling, Glass, Lanthanum, Magnetic field effects, Manganese, Neutron diffraction, Positive ions, Synthesis (chemical), Aurivillius phase, Generic formula, Magnetic characterization, Neutron powder diffraction, Bismuth compounds, bismuth, ferromagnetic material, lanthanum, manganese oxide, niobium, perovskite, strontium, transition element, analytic method, article, crystallography, magnetism, measurement, neutron diffraction, oxidation, phase transition, receptor occupancy, structure analysis, X ray powder diffraction
Subjects: 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 09:45 UTC
Last Modified: 10 Apr 2015 09:45 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/47938 (The current URI for this page, for reference purposes)
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