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Effect of [Fe(CN)<sub>6</sub>]<sup>4ā</sup> Substitutions on the Spin-Flop Transition of a Layered Nickel Phyllosilicate
No full textA 3 to 1 Ni/Si antiferromagnetic layered phyllosilicate,
Ni<sub>3</sub>SiĀ(C<sub>3</sub>H<sub>6</sub>NH<sub>3</sub>)ĀF<sub>0.65</sub>O<sub>1.9</sub>(OH)<sub>4.45</sub>(CH<sub>3</sub>COO)<sub>1.1</sub>Ā·<i>x</i>H<sub>2</sub>O, was modified with K<sub>4</sub>[FeĀ(CN)<sub>6</sub>]Ā·3H<sub>2</sub>O. This compound retained
its ordering as proved by X-ray diffraction, while infrared spectra
revealed the presence of [FeĀ(CN)<sub>6</sub>]<sup>4ā</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 <i>H</i> = 24 kOe. The modified
compound shows increased antiferromagnetic canting and a two-step
transition (<i>H</i><sub>1</sub> = 24 kOe, <i>H</i><sub>2</sub> = 48 kOe). These results testify to the existence of
competing interactions that depend sensitively on the grafted species
