New Template-Free Layered Manganese(III) Phosphate: Hydrothermal Synthesis, Ab Initio Structural Determination, and Magnetic Properties

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• 作者：Stanislav Ferdov ; Armandina M. L. Lopes ; Zhi Lin ; Rute A. Sá ; Ferreira
• 刊名：Chemistry of Materials
• 出版年：2007
• 出版时间：November 27, 2007
• 年：2007
• 卷：19
• 期：24
• 页码：6025 - 6029
• 全文大小：388K
• 年卷期：v.19,no.24(November 27, 2007)
• ISSN：1520-5002

文摘

A new template-free layered manganese(III) phosphate, Na₃MnH(P_0.9O₄)₂, has been hydrothermally synthesized. The crystal structure was solved ab initio from powder X-ray diffraction data, and the model was confirmed using the Rietveld method. The material crystallizes in triclinic space group P1 (No. 2) with lattice parameters a = 5.2925(2) Å, b = 6.9004(3) Å, c = 5.2452(3) Å, α = 91.56(0)°, β = 116.95(0)°, γ = 90.5(0)°, and Z = 1. The structure consists of [Mn(P_0.9O₄)₂]_∞ layers composed of isolated MnO₆ octahedra connected via corner-sharing asymmetric PO₄ tetrahedra. The interconnection between the layers is assured by Na⁺ cations, which reside in the interlayered space. The system is paramagnetic above 50 K, with an effective paramagnetic moment of 4.85(3) μ_B, ascertaining the Mn³⁺ valence state of the Mn ions. Antiferromagnetic short-range-order effects are observed below 26.5 K.