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- W1997863863 abstract "The high-pressure polymorphs of KCN, KCN III, and KCN IV, have been investigated by neutron diffraction using a polycrystalline sample. High-resolution intensity data have been obtained which confirm the structural description of KCN III but contradict the description of KCN IV suggested by previous high-pressure x-ray work. At a pressure of 25 kbar and at room temperature, KCN IV has a monoclinic structure with the $Cm({C}_{s}^{3})$ space group in which the C and N nuclei lie nearly along the body diagonal of a slightly distorted cube of ${mathrm{K}}^{+}$ ions. The conclusion from the x-ray work that KCN IV is rhombohedral is contradicted both by our intensity data and by the fact that several of the diffraction lines are displaced slightly from rhombohedral positions. Increase of the temperature from 66 to 74 ifmmode^circelsetextdegreefi{}C at a pressure of 22 kbar results in the transformation from phase IV into the cubic phase KCN III with the space group $mathrm{Pm}3m({O}_{h}^{1})$ in which the ${mathrm{CN}}^{ensuremath{-}}$ molecules are ordered randomly along the eight equivalent [111] directions. The temperature factors in KCN III are unusually large indicating a high probability of a C${mathrm{N}}^{ensuremath{-}}$ ion jumping between equilibrium positions along the eight diagonal configurations." @default.
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- W1997863863 date "1974-10-15" @default.
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- W1997863863 title "Neutron diffraction study of KCN III and KCN IV at high pressure" @default.
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- W1997863863 doi "https://doi.org/10.1103/physrevb.10.3584" @default.
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