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Origin and stability of the dipolar response in a family of tetragonal tungsten bronze relaxors

Rotaru, A., Arnold, Donna C., Daoud-Aladine, A., Morrison, F.D. (2011) Origin and stability of the dipolar response in a family of tetragonal tungsten bronze relaxors. Physical Review B - Condensed Matter and Materials Physics, 83 (18). p. 184302. ISSN 1098-0121. E-ISSN 1550-235X. (doi:10.1103/PhysRevB.83.184302) (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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Official URL
http://dx.doi.org/10.1103/PhysRevB.83.184302

Abstract

A new family of relaxor dielectrics with the tetragonal tungsten bronze structure (nominal composition Ba6M3+Nb9O 30, M3+ = Ga, Sc, or In) were studied using dielectric spectroscopy to probe the dynamic dipole response and correlate this with the crystal structure as determined from powder neutron diffraction. Independent analyses of real and imaginary parts of the complex dielectric function were used to determine characteristic temperature parameters, TVF and TUDR, respectively. In each composition both these temperatures correlated with the temperature of maximum crystallographic strain, T c/a, determined from diffraction data. The overall behavior is consistent with dipole freezing and the data indicate that the dipole stability increases with increasing M3+ cation size as a result of increased tetragonality of the unit cell. Crystallographic data suggests that these materials are uniaxial relaxors with the dipole moment predominantly restricted to the B1 cation site in the structure. Possible origins of the relaxor behavior are discussed.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevB.83.184302
Additional information: Unmapped bibliographic data: C7 - 184302 [EPrints field already has value set] LA - English [Field not mapped to EPrints] J2 - Phys. Rev. B Condens. Matter Mater. Phys. [Field not mapped to EPrints] AD - EaStCHEM School of Chemistry, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9ST, United Kingdom [Field not mapped to EPrints] AD - ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Subjects: Q Science > QC Physics > QC176 Solid state physics
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Giles Tarver
Date Deposited: 07 Jul 2015 10:57 UTC
Last Modified: 29 May 2019 14:43 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49060 (The current URI for this page, for reference purposes)
Arnold, Donna C.: https://orcid.org/0000-0003-0239-5790
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