Towards novel multiferroic and magnetoelectric materials: dipole stability in tetragonal tungsten bronzes
Abstract
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.
Citation
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
Publication
Philosophical Transactions of the Royal Society. A, Mathematical, Physical and Engineering Sciences
Status
Peer reviewed
ISSN
1364-503XType
Journal article
Description
authors thank the Engineering and Physical Science Research Council for funding (grant no. EP/F004133/1).Collections
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