Person:
Martínez De Irujo Labalde, Xabier

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First Name
Xabier
Last Name
Martínez De Irujo Labalde
URI
https://hdl.handle.net/20.500.14352/86806
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Ciencias Químicas
Department
Química Inorgánica
Area
Química Inorgánica
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2019 - 201912020 - 20212
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Author: García Martín, Susana × Has files: true ×

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Now showing 1 - 3 of 3
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    Structural Ordering Supremacy on the Oxygen Reduction Reaction of Layered Iron-Perovskites
    (Inorganic Chemistry, 2020) Martínez De Irujo Labalde, Xabier; Marín Gamero, Rafael; Urones Garrote, Esteban; García Martín, Susana; ACS Publications
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    Multiferroism induced by spontaneous structural ordering in antiferromagnetic iron perovskites
    (Chemistry of Materials, 2019) Martínez De Irujo Labalde, Xabier; Goto, Masato; Urones-Garrote, Esteban; Amador, Ulises; Ritter, Clemens; Amano Patino, Midori ; Koedtruad, Anucha; Tan, Zhenhong; Shimakawa, Yuichi; García Martín, Susana
    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.
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    3D to 2D Magnetic Ordering of Fe3+ Oxides Induced by Their Layered Perovskite Structure
    (Inorganic Chemistry, 2021) García Martín, Susana; Martínez De Irujo Labalde, Xabier; Amador, Ulises; Ritter, Clemens; Goto, Masato; Patino, Midori Amano; Shimakawa, Yuichi
    The antiferromagnetic behavior of Fe3+ oxides of composition RE1.2Ba1.2Ca0.6Fe3O8, RE2.2Ba3.2Ca2.6Fe8O21, and REBa2Ca2Fe5O13 (RE = Gd, Tb) is highly influenced by the type of oxygen polyhedron around the Fe3+ cations and their ordering, which is coupled with the layered RE/Ba/Ca arrangement within the perovskite-related structure. Determination of the magnetic structures reveals different magnetic moments associated with Fe3+ spins in the different oxygen polyhedra (octahedron, tetrahedron, and square pyramid). The structural aspects impact on the strength of the Fe-O-Fe superexchange interactions and, therefore, on the Neel temperature ( ́ TN) of the compounds. The oxides present an interesting transition from three-dimensional (3D) to two-dimensional (2D) magnetic behavior above TN. The 2D magnetic interactions are stronger within the FeO6 octahedra layers than in the FeO4 tetrahedra layers.