HRTEM and micro-raman studies on superconducting-superionic conducting nanohybrid, Ag1.17I1.54Bi2Sr2CaCu 2Oy

Jin Ho Choy, Young Il Kim, Seong Ju Hwang, Yuji Muraoka, Naoyuki Ohnishi, Kenji Hiraga, Pham V. Huong

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The crystal structure of the superconducting-superionic conducting nanohybrid, Ag1.17I1.54Bi2Sr2CaCu 2Oy, 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.

Original languageEnglish
Pages (from-to)9086-9090
Number of pages5
JournalJournal of Physical Chemistry B
Issue number39
Publication statusPublished - 2000 Oct 5

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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