Woo Jun Kwon

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New iron-based mixed-polyanion compounds Li(x)Na(4-x)Fe(3)(PO(4))(2)(P(2)O(7)) (x = 0-3) were synthesized, and their crystal structures were determined. The new compounds contained three-dimensional (3D)sodium/lithium paths supported by P(2)O(7) pillars in the crystal. First principles calculations identified the complex 3D paths with their activation(More)
We have studied chalcogenide Ni<sub>1-x</sub>Fe<sub>x</sub>Ga<sub>2</sub>S<sub>4</sub>, showing geometrical frustration effect. M-H curves at 4.2 K reveal that the disordered spins cannot be rotated completely along the direction of high external field of 5 T, since these spins are strongly constrained in the triangular lattice. H<sub>C</sub> increases with(More)
We have investigated the structural and magnetic properties of FeTiTaO<sub>6</sub>. From the Rietveid-refined XRD patterns of FeTiTaO<sub>6</sub>, its crystal structure at room temperature is determined to be the rutile structure with lattice constants of &#x03B1;<sub>0</sub> = 4.65 &#x212B;, and c<sub>0</sub> = 3.02 &#x212B;. The c/a ratio of 0.649 is(More)
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