Abstract
We have developed a new interstratified system consisting of a superconducting layer alternating with a superionic conducting one, which is the AgI intercalated Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub y} with well-defined 2-dimensional heterostructure. Before and after the intercalation of AgI, the superconducting properties remained unchanged with the T{sub c}`s of 76 K for the pristine and 63 K for the intercalate. From the extended X-ray absorption fine structure spectroscopic analysis, it is found that the intercalated AgI is formed as the {beta}-like intracrystalline structure in the 2-dimensional interlayer space of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub y}. According to the ac impedance and dc relaxation measurements, the ionic transference number (t{sub i} = {sigma}{sub i}/{sigma}{sub r}) has been estimated to be 0.27 (at 167{degree}C), indicating that the substantial ionic conductivity ({sigma}{sub 1}) contributes to the total electrical one ({sigma}{sub T}). In comparison of the ionic conductivity for (AgI)Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub y} ({sigma}{sub i} = 10{sup -3}-10{sup -23} {Omega}{sup -1} cm{sup -1}) with those for the well-known superionic conductors of cation-substituted {beta}-aluminas, the ionic transport in (AgI)Bi{sub 2}Sr{sub 2}-CaCu{sub 2}O{sub y} turned out to be significant, even comparable with the superionic conductors. 15 refs., 4 figs., 1 tab.
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