Low-Temperature Forms of Superionic Conductors, Cu8GeS6 and Ag7TaS6, and Ion Conduction Path: Analysis of Multiple Twins Through Six-Dimensional Twin Analysis Technique
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Accession number;06A0382475
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| Title;Low-Temperature Forms of Superionic Conductors, Cu8GeS6 and Ag7TaS6, and Ion Conduction Path: Analysis of Multiple Twins Through Six-Dimensional Twin Analysis Technique |
| Author;
ONODA MITSUKO
(Advanced Materials Lab., National Inst. Materials Sci., JPN)
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Journal Title;Journal of the Crystallographic Society of Japan
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Journal Code:G0232A
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ISSN:0369-4585
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VOL.48;NO.2;PAGE.140-146(2006)
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| Figure&Table&Reference;FIG.6, TBL.3, REF.15 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The structures of the orthorhombic room-temperature phase of Cu8GeS6 (phase II) and the monoclinic low-temperature phase of Ag7TaS6 (phase II) have been successfully refined based on X-ray diffraction data from 12-fold twinned (Cu8GeS6 II) and 24-fold twinned (Ag7TaS6 II) crystals. Respectively among 6 major and 6 minor twin domains of Cu8GeS6 II, or among 12 major and 12 minor twin domains of Ag7TaS6 II, the argyrodite-type frameworks, GeS6 or TaS6, can be superposed to each other in principle, and only Cu-Cu or Ag-Ag network directions differ. At higher temperature, the crystals were considered to be 2-fold twinned crystals of superionic-conductor phase I with a space group F43m. On cooling, each domain transforms into 6 domains of orthorhombic Cu8GeS6 II or 12 domains of monoclinic Ag7TaS6 II. Superposed projections along 6 directions of the structure of Cu8GeS6 II and along 12 directions of the structure of Ag7TaS6 II seem to show approximate expressions for Cu-ion and Ag-ion conduction paths in superionic-conductor phases, Cu8GeS6 I and Ag7TaS6 I. (author abst.) |
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