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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 language | English |
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Article number | 20120451 |
Journal | Philosophical Transactions of the Royal Society. A, Mathematical, Physical and Engineering Sciences |
Volume | 372 |
Issue number | 2009 |
DOIs | |
Publication status | Published - 28 Feb 2014 |
Event | Royal Society Discussion Meeting on Magnetoelectric phenomena and devices - The Royal Society, London, United Kingdom Duration: 24 Jul 2012 → 25 Jul 2012 |
Keywords
- Relaxor
- Ferroelectric
- Multiferroic
- Structure-property relationships
- Dielectric properties
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Dive into the research topics of 'Towards novel multiferroic and magnetoelectric materials: dipole stability in tetragonal tungsten bronzes'. Together they form a unique fingerprint.Projects
- 1 Finished
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Magnetoelectricity & Multiferroic 4133/1: Magnetoelectricity and Multiferroic Behaviour in Tungsten Bronze Oxides
Morrison, F. (PI)
8/01/08 → 7/01/10
Project: Standard
Research output
- 1 Article
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Vogel-Fulcher analysis of relaxor dielectrics with the tetragonal tungsten bronze structure: Ba6MNb9O30 (M = Ga, Sc, In)
Rotaru, A. & Morrison, F. D., May 2015, In: Journal of Thermal Analysis and Calorimetry. 120, 2, p. 1249-1259Research output: Contribution to journal › Article › peer-review
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