Abstract
KCr5Se8 has a TIV5S8-type structure, containing K ions in one-dimensional tunnels. Deintercalated samples of KxCr5Se8 (0.32 ≤ x ≤ 0.93) were prepared by leaching method using Alc3/FeCl3 aqueous solution. These samples showed a broad peak of magnetic susceptibility at ca. 130 K. 57Fe-Mössbauer spectra of Kx(Cr0.95 57Fe0.05)5Se8 (x = 1.0, 0.49) showed a quadrupole doublet at 300 K. Magnetic sextets appeared at 4.2 K in both samples, indicative of magnetic ordering. The observed isomer shift indicated that the charge of Fe is +3 in both samples. It was proposed that Se2- was partially oxidized by the deintercalation.
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