Towards novel multiferroic and magnetoelectric materials: dipole stability in tetragonal tungsten bronzes

Andrei Rotaru, Andrew Miller, Donna Claire Arnold, Finlay D. Morrison

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19 Citations (Scopus)
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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.

Original languageEnglish
Article number20120451
JournalPhilosophical Transactions of the Royal Society. A, Mathematical, Physical and Engineering Sciences
Volume372
Issue number2009
DOIs
Publication statusPublished - 28 Feb 2014
EventRoyal Society Discussion Meeting on Magnetoelectric phenomena and devices - The Royal Society, London, United Kingdom
Duration: 24 Jul 201225 Jul 2012

Keywords

  • Relaxor
  • Ferroelectric
  • Multiferroic
  • Structure-property relationships
  • Dielectric properties

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