Bismuth-based perovskites as multiferroics

Abstract

This review devoted to multiferroic properties of Bismuth-based perovskites falls into two parts. The first part focuses on BiFeO 3 and summarizes the recent progress made in the studies of its pressure-temperature phase diagram and magnetoelectric coupling phenomena. The second part discusses in a more general way the issue of polar -and multiferroic -phases in BiBO 3 perovskites and the competition between ferroelectricity and other structural instabilities, from an inventory of recently synthetized compounds. RésuméMultiferroïcité dans les pérovskites au bismuth. Cette revue consacrée aux pérovskites multiferroïquesà base de bismuth BiBO 3 est scindée en deux parties. La première est consacrée au cas de BiFeO 3 et résume les progrès récents réalisés dans l'étude de son diagramme de phases pression-température, et de ses phénomènes de couplage magnéto-électrique. La seconde partie aborde de manière plus générale, a partir d'un inventaire des composés récemment synthétisés, la question de la stabilité des phases polaires -et multiferroiques -dans les pérovskites BiBO 3 et la compétition entre la ferroélectricité et les autres instabilités structurales.

Polymorphism in Bi-based perovskite oxides: A first-principles study

“…None of the other bismuth 3d transition-metal per-ovskite insulators displays this R3c structure in bulk. 10,11 BiCoO 3 crystallizes in what is called a supertetragonal structure-a tetragonal structure of P 4mm space group where the c/a ratio is so large (1.27) that the O 6 octahedra become O 5 pyramids, as depicted in Fig. 1(b); every plane of Co 3+ ions perpendicular to the c axis has its spin aligned antiparallel to that of its nearest neighbors, while these planes are stacked along c in ferromagnetic fashion (BiCoO 3 is therefore a C-type antiferromagnet).…”

Observation of large dielectric permittivity and dielectric relaxation phenomenon in Mn-doped lanthanum gallate

“…Recently the search for new multiferroic and/or magnetodielectric materials has triggered intense scientic research worldwide. 1 Connected to this, lead-free and bismuth-based materials are investigated to a large extent 2,3 and the high k dielectric materials such as BaTiO 3 , SrTiO 3 etc. were doped with magnetic impurities to achieve the above-mentioned properties.…”

Prediction of a native ferroelectric metal

“…Inspired by the observation that perovskites where Bi 3+ replaces La 3+ tend to be ferroelectric due to Bi 3+ 's tendency to form low-coordination complexes with neighboring oxygens 14,15 , we explore symmetry breaking in Bi-5517, obtained by replacing all La atoms with Bi's. As in La-5517, the Immm phase is a high-energy saddle point.…”