Effect of [Fe(CN)6]4鈥?/sup> Substitutions on the Spin-Flop Transition of a Layered Nickel Phyllosilicate

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• 作者：Konstantinos Dimos ; Ioannis Panagiotopoulos ; Theodoros Tsoufis ; R茅gis Y. N. Gengler ; Aliki Moukarika ; Petra Rudolf ; Michael A. Karakassides ; Thomas Bakas ; Dimitrios Gournis
• 刊名：Langmuir
• 出版年：2012
• 出版时间：July 10, 2012
• 年：2012
• 卷：28
• 期：27
• 页码：10289-10295
• 全文大小：421K
• 年卷期：v.28,no.27(July 10, 2012)
• ISSN：1520-5827

文摘

A 3 to 1 Ni/Si antiferromagnetic layered phyllosilicate, Ni₃Si(C₃H₆NH₃)F_0.65O_1.9(OH)_4.45(CH₃COO)_1.1路xH₂O, was modified with K₄[Fe(CN)₆]路3H₂O. This compound retained its ordering as proved by X-ray diffraction, while infrared spectra revealed the presence of [Fe(CN)₆]^{4鈥?/sup> groups and X-ray photoelectron spectroscopy showed that the latter partially substitute the acetate groups. Both the parent and the modified compound are canted antiferromagnets with an anisotropy perpendicular to the layers and show spin-flop transitions. For the parent compound, a single step spin-flop occurs at H = 24 kOe. The modified compound shows increased antiferromagnetic canting and a two-step transition (H₁ = 24 kOe, H₂ = 48 kOe). These results testify to the existence of competing interactions that depend sensitively on the grafted species.}