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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.
|Philosophical Transactions of the Royal Society. A, Mathematical, Physical and Engineering Sciences
|Published - 28 Feb 2014
|Royal Society Discussion Meeting on Magnetoelectric phenomena and devices - The Royal Society, London, United Kingdom
Duration: 24 Jul 2012 → 25 Jul 2012
- Structure-property relationships
- Dielectric properties
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- 1 Finished
Magnetoelectricity & Multiferroic 4133/1: Magnetoelectricity and Multiferroic Behaviour in Tungsten Bronze Oxides
8/01/08 → 7/01/10