Abstract
The crystal structure of the superconducting−superionic conducting nanohybrid, Ag1.17I1.54Bi2Sr2CaCu2Oy, has been investigated by performing high-resolution transmission electron microscopy (HRTEM) and micro-Raman spectroscopy. From the HRTEM image along the [110] direction, it is found that a hexagonal-like array of AgI4 tetrahedra is stabilized between each [Bi−O]2 double layer with a staggered configuration of host block. The two-dimensionally extended Ag−I sublattice provides a favorable migration path for Ag+ ions that is consistent with high ionic conductivity of the Ag−I intercalate. According to the polarized micro-Raman spectroscopy, the doubly split OSr phonon line is collapsed into a single one upon Ag−I intercalation, as observed in the phase of IBi2Sr2CaCu2Oy. Such an evolution of the OSr phonon peak is surely attributed to a weakening of the OBi−Bi−OSr coupling due to the remarkable lattice expansion, which is in good agreement with the HRTEM result.
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