AM3(P2O7)2 (A = Alkaline-Earth Metals; M = Fe, Co, Ni): Diphosphates Containing Infinite Chains of Edge-Sharing MO6 Octahedra

Kwang Hwa Lii, Pei Fen Shih, Teng Ming Chen

研究成果: 雜誌貢獻期刊論文同行評審

38 引文 斯高帕斯(Scopus)

摘要

Diphosphates of the stoichiometry AM3(P2O7)2 (A = alkaline-earth metals; M = Fe, Co, Ni) have been synthesized and structurally characterized by single-crystal X-ray diffraction. Crystal data: CaNi3(P2O7)2, monoclinic, P21/c, a = 7.330(3) Å, b = 7.589(3) Å, c = 9.400(3) Å, β = 111.90(3)∘, V = 485.1(3) Å3, Z = 2, and R = 0.026; CaCo3(P2O7)2, as above except a = 7.394(1) Å, b = 7.6266(9) Å, c = 9.444(2) Å, β= 111.73(2)∘, V= 494.7(1) Å3, and R = 0.035; SrFe3(P2O7)2, as above except a = 7.553(1) Å, b = 7.7477(8) Å, c = 9.5796(8) Å, β = 112.11(1)∘, V = 519.4(1) Å3, and R = 0.029. The three compounds are isostructural, consisting of zigzag infinite chains of MO6 octahedra sharing either trans or skew edges. The infinite chains are connected by P2O7 groups to form a three-dimensional architecture with channels parallel to the b axis. Alkaline-earth metals are located in sites within the channels. The following isostructural compounds have also been prepared: AM3(P2O7)2 (A = Sr, Ba; M = Ni, Co) and BaFe3(P2O7)2. A magnetic susceptibility study on SrFe3(P2O7)2 indicates that the material is paramagnetic with an effective magnetic moment of 5.07 µB per Fe between 300 and 26 K. Below this temperature the magnetic susceptibility increases sharply to a maximum at 6 K and then decreases rapidly. Mossbauer spectra also confirm the presence of Fe(II).

原文???core.languages.en_GB???
頁(從 - 到)4373-4377
頁數5
期刊Inorganic Chemistry
32
發行號20
DOIs
出版狀態已出版 - 1993

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