Details

Autor(en) / Beteiligte

• Rotaru, Andrei
• Miller, Andrew J.
• Arnold, Donna C.
• Morrison, Finlay D.

Titel

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

Ist Teil von

• Philosophical transactions of the Royal Society of London. Series A: Mathematical, physical, and engineering sciences, 2014-02, Vol.372 (2009), p.20120451-20120451

Ort / Verlag

England: The Royal Society Publishing

Erscheinungsjahr

2014

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.