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Multiferroism Induced by Spontaneous Structural Ordering in Antiferromagnetic Iron Perovskites

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García-Martín, Susana and Martínez de Irujo-Labalde, Xabier and Goto, Masato and Urones-Garrote, Esteban and Amador, Ulises and Ritter, Clemens and Amano Patino, Midori E and Koedtruad, Anucha and Tan, Zhenhong and Shimakawa, Yuichi (2019) Multiferroism Induced by Spontaneous Structural Ordering in Antiferromagnetic Iron Perovskites. Chemistry of Materials (31). pp. 5993-6000. ISSN ISSN: 0897-4756

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Official URL: DOI: 10.1021/acs.chemmater.9b02716

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	Cations, Crystal structure, Layers, Oxides, Perovskites
Subjects:	Sciences > Chemistry Sciences > Chemistry > Chemistry, Inorganic
ID Code:	77115
Deposited On:	27 Mar 2023 11:28
Last Modified:	27 Mar 2023 11:28

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