Cation-exchanged perovskite and tetragonal tungsten bronze phases - a novel route to multiferroic materials
There has been much interest recently in the study of magnetoelectric and multiferroic phases, which exhibit both ferroelectric and magnetic behaviour, with a particular interest in materials which exhibit coupling between the two behaviours. We have performed topochemical cation exchange reactions, on known ferroelectric materials of composition NaMO3 (perovskite) and NaBa2M5O15 (tetragonal tungsten bronze) (M = Nb, Ta) to replace the A-site Na+ cations with paramagnetic ions, whilst maintaining the acentric crystal structure of the original phase. As a result we have prepared a number of new phases with magnetic A-cations residing in an acentric MO6 perovskite lattice Specifically we have prepared Ni0.5Ba2Ta5O15, Cu0.5Ba2Ta5O15, Ni0.5TaO3, Cu0.5NbO3, Cu2.5Nb5O15. These phases containing corner shared arrays of MO6 (M = Nb, Ta) octahedra which adopt an acentric arrangement due to the second-order Jahn teller effect. As a result these phases are acentric magnetic materials, and are thus good candidates to exhibit multiferroic behaviour.
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Michael A Hayward; Midori Amano Patino; DENIS ROMERO Fabio and SUARD Emmanuelle. (2013). Cation-exchanged perovskite and tetragonal tungsten bronze phases - a novel route to multiferroic materials. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-23-658
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