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Journal ArticleDOI

Crystal Structure of the Solid Electrolyte(C5H5NH) Ag5I6 at -30°C

S. Geller1
02 Jun 1972-Science (American Association for the Advancement of Science)-Vol. 176, Iss: 4038, pp 1016-1019
TL;DR: The crystal structure of pyridinium hexaiodopentaargentate, (C5H5NH) Ag5l6, is unique among those of the halide and chalcogenide solid electrolytes in that face sharing iodide octahedra as well as face sharing tetrahedra and face-sharing between octahedral and tetrahedral provide the paths for silver ion transport as mentioned in this paper.
Abstract: The crystal structure of pyridinium hexaiodopentaargentate, (C5H5NH) Ag5l6, is unique among those of the halide and chalcogenide solid electrolytes in that face-sharing iodide octahedra as well as face-sharing tetrahedra and face-sharing between octahedra and tetrahedra provide the paths for silver ion transport. There are two formula units in a hexagonal cell, space group P6/mcc (D6h2). At -30°C, the lattice constants are a = 11.97 ± 0.02, c = 7.41 ± 0.01 A. The structure has three sets of sites for the silver ions. At -30°C two of these sets are apparently filled with the ten silver ions per unit cell, while the third set of tetrahedrally coordinated general positions is empty. Therefore, the conductivity at this temperature is limited by the thermal excitation of the silver ions into the empty tetrahedra.
Citations
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Journal ArticleDOI
TL;DR: In this paper, it was shown that the defect energy required for the formation of a defect pair greatly exceeds the thermal energy, kBT, in a typical ionic crystal, and the same is true of the ionic conductivity.

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TL;DR: The recent progress of d 10 iodoargentates(I)/iodocuprate(I) hybrids from structural construction and directed synthesis rules to their photochromic and thermochromic properties is reviewed in this article.

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TL;DR: In this article, a three-dimensional network of passageways is described and an attempt is made to give a complete description of it, but an attempt has been made to describe the three dimensional network.

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References
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Journal ArticleDOI
21 Jul 1967-Science
TL;DR: The crystal structure of the solid electrolyte RbAg4I5 has been determined from single-crystal x-ray diffraction counter data and the occurrence of the two low-temperature phases has been established by x-rays diffraction and optical examination.
Abstract: The crystal structure of the solid electrolyte RbAg4I5 has been determined from single-crystal x-ray diffraction counter data. There are four RbAg4I5 in a cubic unit cell with a = 11.24 A. The structure refinement, by least squares, is based on space group P413 (O7). The arrangement of the iodide ions is similar to that of the manganese atoms in β-manganese, and provides 56 iodide tetrahedra per unit cell, which share faces in such manner as to provide diffusion paths for the silver ions. The occurrence of the two low-temperature phases of RbAg4I5 has been established by x-ray diffraction and optical examination.

255 citations

Journal ArticleDOI
TL;DR: In this paper, the crystal structure of polycrystalline [C 5 H 5 NH]Ag 5 I 6 was determined at six different temperatures, between −30 and 125°C, from single crystal X-ray diffraction data.

61 citations

Journal ArticleDOI
TL;DR: The crystal structure of [(CH3)4N]2Ag13I15 has been determined from single crystal x-ray diffraction counter data as mentioned in this paper, which belongs to space group R32-D37 and contains one (three) [(CH 3 4N] 2Ag 13I15 in a rhombohedral (hexagonal) unit cell with dimensions a = 11.52 ± 0.02 A, α α = 67.35
Abstract: The crystal structure of [(CH3)4N]2Ag13I15 has been determined from single crystal x‐ray diffraction counter data. The structure belongs to space group R32‐D37 and contains one (three) [(CH3)4N]2Ag13I15 in a rhombohedral (hexagonal) unit cell with dimensions a = 11.52 ± 0.02 A, α = 67.35 ± 0.15° (a = 12.77 ± 0.03, c = 26.54 ± 0.05 A). All iodide ions are at the corners of face‐sharing tetrahedra. These tetrahedra are arranged in two kinds of channels, one of which ends at the crystal surfaces; the other is a 10‐tetrahedra channel beginning at one tetramethylammonium ion and ending at another. The former are probably the more important for the diffusion of the Ag+ ions through the crystal. The Ag+ ions may diffuse from one channel to another via interconnecting face‐sharing tetrahedra. One out of eight crystallographically nonequivalent tetrahedra is not in either kind of channel, but also links channels. There are 123 tetrahedra and 39 Ag+ ions in each triply primitive hexagonal cell. The distribution of ...

53 citations