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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26 Citations (Scopus)
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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.

Original languageEnglish
Article number20120451
JournalPhilosophical Transactions of the Royal Society. A, Mathematical, Physical and Engineering Sciences
Issue number2009
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


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


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