García-Martín, SusanaMartínez de Irujo Labalde, XabierGoto, MasatoUrones-Garrote, EstebanAmador, UlisesRitter, ClemensAmano Patino, Midori EKoedtruad, AnuchaTan, ZhenhongShimakawa, Yuichi2023-06-172023-06-172019ISSN: 0897-475610.1021/acs.chemmater.9b02716https://hdl.handle.net/20.500.14352/12905Room-temperature multiferroism in polycrystalline antiferromagnetic Fe perovskites is reported for the first time. In the perovskite-type oxides RE1.2Ba1.2Ca0.6Fe3O8 (RE = Gd, Tb), the interplay of layered ordering of Gd(Tb), Ba, and Ca atoms with the ordering of FeO4-tetrahedra (T) and FeO6-octahedra (O) results in a polar crystal structure. The layered structure consists of the stacking sequence of RE/Ca-RE/Ca-Ba-RE/Ca layers in combination with the TOOT sequence in a unit cell. A polar moment of 33.0 μC/cm2 for the Gd-oxide (23.2 μC/cm2 for the Tb one) is determined from the displacements of the cations, mainly Fe, and oxygen atoms along the b-axis. These oxides present antiferromagnetic ordering doubling the c-axis, and the magnetic structure in the Tb compound remains up to 690 K, which is one of the highest transition temperatures reported in Fe perovskites.engAtribución-NoComercial 3.0 Españahttps://creativecommons.org/licenses/by-nc/3.0/es/journal articleDOI: 10.1021/acs.chemmater.9b02716open access546CationsCrystal structureLayersOxidesPerovskitesQuímicaQuímica inorgánica (Química)23 Química2303 Química Inorgánica