The Ba<sub>2</sub>LnFeNb<sub>4</sub>O<sub>15</sub> “tetragonal tungsten bronze”: Towards RT composite multiferroics
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en
Article de revue
Este ítem está publicado en
Solid State Sciences. 2009, vol. 11, n° 6, p. 1118–1123
Elsevier
Resumen en inglés
Several Niobium oxides of formula Ba_2LnFeNb_4O_{15} (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 ...Leer más >
Several Niobium oxides of formula Ba_2LnFeNb_4O_{15} (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 compound behave as relaxors below 170 and 300 K respectively. The high temperature magnetic susceptibility of the Praseodymium, Neodymium, Samarium, Europium and Gadolinium compounds indicate that they are ferro or ferrimagnetically ordered below Curie temperatures ranging from 680 to 720K. Both ferroelectric and magnetic hysteresis loops are reported at room temperature, thus confirming the multiferroic behaviour of these compounds. Crystal-chemical analysis suggests a close relationship between the distortion of the TTB framework induced by the rare earth and the multiferroic properties.< Leer menos
Palabras clave en inglés
Solid state Chemistry
Crystal-chemistry
Tetragonal tungsten bronze
Dielectric properties
Magnetic properties
Multiferroic properties
Composites
Orígen
Importado de HalCentros de investigación