Synthesis and structure of a new family of 3d-4f heterometallic compounds Rb₇LnFe₆O₂(PO₄)₈ (Ln=Sm, Eu, Gd, Dy): Magnetic properties of the Sm-, Gd-, Dy-derivatives

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• 作者：Liurukara D. Sanjeewa ; J. Palmer West ; Shiou-Jyh Hwu
• 关键词：Phosphate ; Heterometallic ; Magnetism ; Single-crystal X-ray structure ; Trigonal bipyramidal FeO5
• 刊名：Journal of Solid State Chemistry
• 出版年：2012
• 出版时间：August, 2012
• 年：2012
• 卷：192
• 期：Complete
• 页码：337-341
• 全文大小：583 K

文摘

A new family of mixed lanthanide(III) and iron(III) oxo-phosphate phases, Rb₇LnFe₆O₂(PO₄)₈ (Ln=Sm dFont"">1, Eu dFont"">2, Gd dFont"">3, Dy dFont"">4), was isolated by using a high-temperature, solid-state method in molten-salt media. The X-ray single-crystal structure analysis shows that these isomorphic derivatives crystallize in a triclinic space group P-1 (no. 2); Z=1. The 3-D framework of these 3d-4f oxo-phosphates are comprised of LnO₆ octahedral, FeO₅ trigonal bipyramidal (tbp), and ¦Ì₃-oxo [Fe₄O₁₈] tetrameric units interconnected through PO₄ tetrahedra. The preliminary results of the temperature-dependent magnetic susceptibility measurements for selected compounds (dFont"">1, dFont"">3, dFont"">4) reveal antiferromagnetic-like behavior. dFont"">1 shows a weak antiferromagnetric ordering at T_N=¡«7 K while others show little evidence of long-range magnetic order down to 2 K. All three compounds have measured magnetic moments significantly smaller than the expected values.