Microwave-Assisted Synthesis, Microstructure, and Physical Properties of Rare-Earth Chromites

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• 作者：Jes煤s Prado-Gonjal ; Rainer Schmidt ; Juan-Jos茅 Romero ; David 脕vila ; Ulises Amador ; Emilio Mor谩n
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：January 7, 2013
• 年：2013
• 卷：52
• 期：1
• 页码：313-320
• 全文大小：719K
• 年卷期：v.52,no.1(January 7, 2013)
• ISSN：1520-510X

文摘

The full rare-earth (RE) chromites series (RE)CrO₃ with an orthorhombic distorted (Pnma) perovskite structure and the isostructural compound YCrO₃ can be synthesized through a simple microwave-assisted technique, yielding high-quality materials. Magnetization measurements evidence that the N茅el temperature for antiferromagnetic Cr³⁺鈥揅r³⁺ ordering strongly depends on the RE³⁺ ionic radius (IOR), and a rich variety of different magnetic spin interactions exists. Dielectric spectroscopy on sintered pellets indicates electronic inhomogeneity in all samples as manifested by the presence of at least two dielectric relaxation processes associated with grain boundary and grain interior bulk contributions. X-ray diffraction, Raman spectroscopy, and temperature-dependent dielectric permittivity data do not indicate potential noncentrosymmetry in the crystal or concomitant ferroelectricity. Strong correlations between the magnetic and dielectric properties were not encountered, and microwave-synthesized (RE)CrO₃ may not be classified as magnetoelectric or multiferroic materials.