Abstract
Single crystals of K- and Rb-priderites, K( or Rb) x (B y Ti 8− y O 16), which is a one-dimensional ionic conductor were grown from a flux melt of the system K 2O(or Rb 2O)-MoO 3. Chemical compositions, lattice parameters, IR spectra and the habit of the grown crystals are measured. The framework size of tunnel structure, which has remarkable influence on the ionic conductivity, is controlled by the ionic size of the B-elements such as Mg, Zn, Al, Ga and Nb. The variation of the framework size is observed by the change of a-axes and the shift of IR spectra. The influence of the Na ion in the tunnel is also observed to be an impurity barrier for conductive motion of the K ion.
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