Abstract
AbstractThe temperature dependence of 14N NQR frequencies was observed for Orthorhombic crystals of K3[Co(1‐x)Fex(CN)6] (x ∼ 0.02) and monoclinic crystals of K3[Co(1‐x)Fex(CN)6] (x · 0.005). The former crystals yielded two pairs of vI and vII frequencies above 84 K indicating the existence of at least two crystallographically nonequivalent nitrogens. Below 84 K, each line split into two, the average frequency of which increases smoothly with decreasing temperature without showing discontinuity in frequency itself and also its temperature derivative at 84 K. This can be regarded as that the crystal undergoes a structural phase transition of second order at 84 K which agrees fairly well with the previously reported temperature. The mechanism of the phase transition is interpreted in terms of softening of a translational mode of the anions and/or cations. For the monoclinic crystals, a structural phase transition was located at 65 K in agreement with the reported value.
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