2026-06-27T13:54:11Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/129052025-07-17T17:00:59Zcom_20.500.14352_14col_20.500.14352_15

García-Martín, Susana Martínez de Irujo Labalde, Xabier Goto, Masato Urones-Garrote, Esteban Amador, Ulises Ritter, Clemens Amano Patino, Midori E Koedtruad, Anucha Tan, Zhenhong Shimakawa, Yuichi 2023-06-17T12:45:34Z 2023-06-17T12:45:34Z 2019 0897-4756 10.1021/acs.chemmater.9b02716 https://hdl.handle.net/20.500.14352/12905 https://doi.org/10.1021/acs.chemmater.9b02716 Room-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. eng https://creativecommons.org/licenses/by-nc/3.0/es/ open access Atribución-NoComercial 3.0 España Multiferroism Induced by Spontaneous Structural Ordering in Antiferromagnetic Iron Perovskites journal article