Crystal structure and conductivity of the new superionic conductors Ag{sub 4}Zr{sub 3}S{sub 8} and Ag{sub 3.8}Sn{sub 3}S{sub 8}
- National Institute for Research in Inorganic Materials, Namiki (Japan)
The new superionic conductors Ag{sub 4}Zr{sub 3}S{sub 8} and Ag{sub 3.8}Sn{sub 3}S{sub 8} crystallize both in cubic space groups with lattice parameters a = 10.9427(3) {angstrom} (P4{sub 3}32, Z = 4, and {rho} = 4.87 g cm{sup -3}) and a = 10.8013(4) {angstrom} (P4{sub 1}32, Z = 4, and {rho} = 5.39 g cm{sup -3}), respectively. These compounds have similar sulfur packing consisting of sulfur octahedra sharing common edges. In both cases the M cations, either Zr or Sn, are located inside the sulfur octahedra (12d sites). The main crystallographic difference between the two structures is the silver packing. In Ag{sub 4}Zr{sub 3}S{sub 8} the silver ions are located in three different tetrahedral sites, two of them being partially occupied. For Ag{sub 3.8}Sn{sub 3}S{sub 8} the silver ions are exclusively situated in statistically occupied octahedral sites (12d and 4b sites) giving a rock-salt-type lattice. From the properties point of view, they are both mixed conductors exhibiting a relatively high ionic conductivity. The ionic {sigma}{sub Ag}+ and total conductivities were measured from room temperature to 205{degrees}C.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 146486
- Journal Information:
- Journal of Solid State Chemistry, Vol. 116, Issue 2; Other Information: PBD: May 1995
- Country of Publication:
- United States
- Language:
- English
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