Towards novel multiferroic and magnetoelectric materials: dipole stability in tetragonal tungsten bronzes
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We discuss the strategy for development of novel functional materials with the tetragonal tungsten bronze structure. From the starting composition Ba6GaNb9O30, the effect of A- and B-site substitutions on the dielectric properties is used to develop an understanding of the origin and stability of the dipolar response in these compounds. Both tetragonal strain induced by large B-site cations and local strain variations created by isovalent A-site substitutions enhance dipole stability but result in a dilute, weakly correlated dipolar response and canonical relaxor behaviour. Decreasing cation size at the perovskite A2-site increases the dipolar displacements in the surrounding octahedra, but insufficiently to result in dipole ordering. Mechanisms introducing small A-site lanthanide cations and incorporation of A-site vacancies to induce ferroelectricity and magnetism are presented.
Rotaru , A , Miller , A , Arnold , D C & Morrison , F D 2014 , ' Towards novel multiferroic and magnetoelectric materials: dipole stability in tetragonal tungsten bronzes ' , Philosophical Transactions of the Royal Society. A, Mathematical, Physical and Engineering Sciences , vol. 372 , no. 2009 , 20120451 . https://doi.org/10.1098/rsta.2012.0451
Philosophical Transactions of the Royal Society. A, Mathematical, Physical and Engineering Sciences
Copyright © 2014 The Author(s) Published by the Royal Society. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1098/rsta.2012.0451
Descriptionauthors thank the Engineering and Physical Science Research Council for funding (grant no. EP/F004133/1).
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