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RESEARCH PRODUCT
The Ba2LnFeNb4O15 “tetragonal tungsten bronze”: Towards RT composite multiferroics
O. BidaultMario MaglioneO. NguyenMichaël JosseAnnie SimonF. RoullandR. Von Der MühllElias CastelDominique Michausubject
Materials scienceCrystal-chemistryPraseodymium[ PHYS.COND.CM-MS ] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]FOS: Physical scienceschemistry.chemical_elementMineralogy02 engineering and technology01 natural scienceschemistry.chemical_compoundTetragonal crystal system0103 physical sciencesMagnetic propertiesGeneral Materials ScienceMultiferroicsBarium ferriteTetragonal tungsten bronzeComposites010302 applied physicsCondensed Matter - Materials ScienceMultiferroic propertiesMaterials Science (cond-mat.mtrl-sci)General Chemistry021001 nanoscience & nanotechnologyCondensed Matter PhysicsFerroelectricitySamariumCrystallographychemistryDielectric properties[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]Curie temperature0210 nano-technologyEuropiumSolid state Chemistrydescription
Several Niobium oxides of formula Ba2LnFeNb4O15 (Ln = La, Pr, Nd, Sm, Eu, Gd) with the Tetragonal Tungsten Bronze (TTB) structure have been synthesised by conventional solid-state methods. The Neodymium, Samarium and Europium compounds are ferroelectric with Curie temperature ranging from 320 to 440K. The Praseodymium and Gadolinium compounds behave as relaxors below 170 and 300 K respectively. The Praseodymium, Neodymium, Samarium, Europium and Gadolinium compounds exhibit magnetic hysteresis loops at room temperature originating from traces of a barium ferrite secondary phase. The presence of both ferroelectric and magnetic hysteresis loops at room temperature allows considering these materials as composites multiferroic. Based on crystal-chemical analysis we propose some relationships between the introduction of Ln3+ ions in the TTB framework and the chemical, structural and physical properties of these materials.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-01-01 |