Synthesis, structure and characterisation of the n=4 Aurivillius phase Bi{sub 5}Ti{sub 3}CrO{sub 15}

Journal Article · Tue Feb 15 00:00:00 EST 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.09.031· OSTI ID:21494209

Giddings, A T; Stennett, M C; Reid, D P ^[1]; McCabe, E E ^[1]; Greaves, C ^[2]

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1. Department of Materials Science and Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3JD (United Kingdom)
2. School of Chemistry, The University of Birmingham, Edgbaston, Birmingham B15 2 TT (United Kingdom)

The n=4 Aurivillius phase, Bi{sub 5}Ti{sub 3}CrO{sub 15}, was synthesised by solid state reaction. Rietveld analysis of high resolution neutron diffraction data demonstrated this material to adopt the polar space group A2{sub 1}am at room temperature, transforming to the aristotype I4/mmm structure above 650 {sup o}C. This phase transition is coincident with an anomaly in DSC signal and relative permittivity, which are characteristic of a ferroelectric-paraelectric phase transition. Bi{sub 5}Ti{sub 3}CrO{sub 15} exhibits paramagnetic behaviour at low temperature, with short range antiferromagnetic interactions, but no evidence for long range magnetic ordering. This is considered a consequence of significant disorder of Ti and Cr over the available octahedral sites, as demonstrated by analysis of neutron diffraction data. -- Graphical abstract: We report here the synthesis, structure and characterisation of the n=4 Aurivillius phase Bi{sub 5}Ti{sub 3}CrO{sub 15}. Analysis of neutron powder diffraction and XANES data, supported by Madelung energy calculations, demonstrate partial ordering of Ti and Cr cations in the component perovskite layer. Bi{sub 5}Ti{sub 3}CrO{sub 15} is paramagnetic in the temperature range studied but exhibits a dielectric and DSC anomaly at 660 {sup o}C, characteristic of a ferroelectric-paraelectric phase transition. Analysis of high temperature neutron diffraction data confirm a direct phase transition between space groups A2{sub 1}am and I4/mmm at {approx}660 {sup o}C. Display Omitted

• OSTI ID: 21494209
• Journal Information: Journal of Solid State Chemistry, Vol. 184, Issue 2; Other Information: DOI: 10.1016/j.jssc.2010.09.031; PII: S0022-4596(10)00430-5; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ANTIFERROMAGNETISM
BISMUTH COMPOUNDS
CALORIMETRY
CHROMIUM COMPOUNDS
FERROELECTRIC MATERIALS
LAYERS
MAGNETIZATION
NEUTRON DIFFRACTION
ORTHORHOMBIC LATTICES
OXIDES
PARAMAGNETISM
PERMITTIVITY
PEROVSKITE
PHASE TRANSFORMATIONS
SPACE GROUPS
SYNTHESIS
TEMPERATURE RANGE 0400-1000 K
TETRAGONAL LATTICES
TITANIUM COMPOUNDS
X-RAY SPECTROSCOPY
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
DIFFRACTION
ELECTRICAL PROPERTIES
MAGNETISM
MATERIALS
MINERALS
OXIDE MINERALS
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
SCATTERING
SPECTROSCOPY
SYMMETRY GROUPS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS