Microwave-Assisted Synthesis, Microstructure, and Magnetic Properties of Rare-Earth Cobaltites

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• 作者：Julia Gutiérrez Seijas ; Jesús Prado-Gonjal ; David Ávila BrandeIan Terry ; Emilio Morán ; Rainer Schmidt
• 刊名：Inorganic Chemistry
• 出版年：2017
• 出版时间：January 3, 2017
• 年：2017
• 卷：56
• 期：1
• 页码：627-633
• 全文大小：552K
• ISSN：1520-510X

文摘

The series of perovskite rare-earth (RE) doped cobaltites (RE)CoO₃ (RE = La–Dy) was prepared by microwave-assisted synthesis. The crystal structure undergoes a change of symmetry depending on the size of the RE cation. LaCoO₃ is rhombohedral, S.G. R3̅c (No. 167), while, for the rest of the RE series (Pr–Dy), the symmetry is orthorhombic, S.G. Pnma (No. 62). The crystal structure obtained by X-ray diffraction was confirmed by high-resolution transmission electron microscopy, which yielded a good match between experimental and simulated images. It is further shown that the well-known magnetism in LaCoO₃, which involves a thermally induced Co³⁺ (d⁶) low spin to intermediate or high spin state transition, is strongly modified by the RE cation, and a rich variety of magnetic order has been detected across the series.