Influence of ceramic process and Eu content on the composite multiferroic properties of the Ba_6−2xLn_2xFe_1+xNb_9−xO₃₀ TTB system

François Roulland (1) , Michaël Josse (1) , Elias Castel (1) , Mario Maglione (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

The present work reports the optimisation of the composition and elaboration process of Ba_6−2xLn_2xFe_1+xNb_9−xO₃₀ (0.6 < x < 1.0), a composite multiferroic below 440 K. Both firing and sintering conditions have been investigated in order to lower the two spurious phases content and to improve the ceramic quality. The Eu content has also been varied, with subsequent adjustment of cationic content to maintain charge compensation and site occupancies. The evolution of phase content, dielectric and magnetic properties has been evaluated with respect to these parameters. It was found that optimal processing parameters allow a significant improvement of dielectric properties but leave magnetic properties unaffected. Eu content modification impacts both the dielectric and magnetic properties of the TTB samples and changes their dielectric behaviour from ferroelectric to relaxor.

Mots clés: Solid state chemistry; Material sciences; Tetragonal Tungsten Bronze; Dielectric properties; Magnetic properties; Multiferroic properties; Composites

Domaines: Matériaux

François Roulland, Michaël Josse, Elias Castel, Mario Maglione. Influence of ceramic process and Eu content on the composite multiferroic properties of the Ba_6−2xLn_2xFe_1+xNb_9−xO₃₀ TTB system. Solid State Sciences, 2009, 11 (9), pp.1709-1716. ⟨10.1016/j.solidstatesciences.2009.05.031⟩. ⟨hal-00419959⟩