In-situ formation of barium ferrite in iron-doped “tetragonal tungsten bronze”: Elaboration of room temperature multiferroic composites

Abstract

To cite this version:Elias Castel, Michaël Josse, François Roulland, Dominique Michau, Lydia Raison, et al.. In-situ formation of barium ferrite in iron-doped "tetragonal tungsten bronze": Elaboration of room temperature multiferroic composites. Journal of Magnetism and Magnetic Materials, Elsevier, 2009, 321 (11)

Elastic and anelastic relaxations accompanying relaxor ferroelectric behaviour of Ba6GaNb9O30 tetragonal tungsten bronze from resonant ultrasound spectroscopy

“…In recent years, the research dedicated to novel TTB ferroelectric and ferroelectric-related (i.e., relaxors) materials has undergone a revival, with Ba 6 FeNb 9 O 30 (BFNO) as a starting point; many related compositions [28][29][30][31] or solid solutions, usually containing lanthanides [32][33][34][35][36], were studied. Arnold and Morrison [5], and subsequently Liu et al [37], showed that these compounds display relaxor-type behaviour [38][39][40], with the peak maxima in the dielectric permittivity occurring in the temperature range 130-150 K. Earlier data indicated that BFNO is not electrically homogeneous [34], with oxygen vacancy gradients due to the variable oxidation state of Fe (Fe 3?…”

“…Arnold and Morrison [5], and subsequently Liu et al [37], showed that these compounds display relaxor-type behaviour [38][39][40], with the peak maxima in the dielectric permittivity occurring in the temperature range 130-150 K. Earlier data indicated that BFNO is not electrically homogeneous [34], with oxygen vacancy gradients due to the variable oxidation state of Fe (Fe 3? /Fe 2?…”

Multiferroic ceramics in BaO–Y2O3–Fe2O3–Nb2O5 system

“…By using the wet-chemical processing, in situ synthesis of multiferroic composites has been achieved and a three times larger magnetoelectric (ME) voltage coefficient was observed in the in situ synthesized samples [10]. The in situ synthesis of multiferroic composite was reported by Josse et al in Ba 2 LnFeNb 4 O 15 (Ln = rare earth) system [20,21].…”

Microstructural and high-temperature impedance spectroscopy study of Ba6MNb9O30 (M=Ga, Sc, In) relaxor dielectric ceramics with tetragonal tungsten bronze structure

“…This rich diversity of elements which can be incorporated into the TTB structure allows for compositional tuning that has been exploited for development of new phases [13,19] ranging from ferroelectrics [20][21][22] to microwave dielectrics [23,24] and to ionic conductors [25]. During the last few years, the research dedicated to novel TTB ferroelectric and ferroelectric-related materials resurrected [15][16][17][18][19][20][21][22][26][27][28][29][30][31], with the Ba 6 FeNb 9 O 30 (BFNO) [32][33][34][35] as starting point. Earlier data reported that BFNO is ferroelectric with T C values either in the range 133-138 K [36] or 570-583 K [37,38], however being not electrically homogeneous [29] and with oxygen vacancy gradients due to the variable oxidation state of Fe (Fe 3+ /Fe 2+ ); both low temperature dielectric spectroscopy and high temperature impedance spectroscopy measurements indicated more electroactive regions than anticipated [16].…”

“…During the last few years, the research dedicated to novel TTB ferroelectric and ferroelectric-related materials resurrected [15][16][17][18][19][20][21][22][26][27][28][29][30][31], with the Ba 6 FeNb 9 O 30 (BFNO) [32][33][34][35] as starting point. Earlier data reported that BFNO is ferroelectric with T C values either in the range 133-138 K [36] or 570-583 K [37,38], however being not electrically homogeneous [29] and with oxygen vacancy gradients due to the variable oxidation state of Fe (Fe 3+ /Fe 2+ ); both low temperature dielectric spectroscopy and high temperature impedance spectroscopy measurements indicated more electroactive regions than anticipated [16]. investigated by temperature-dependent powder neutron diffraction (TDPND) and by dielectric spectroscopy (DS); the confirmation of the phase formation and the crystallographic identification, but also the relaxor dielectric properties of these dense ceramic materials were already reported [39].…”