Synthesis, crystal structure, and ionic conductivity of novel Ruddlesden-Popper related phases, Li{sub 4}Sr{sub 3}Nb{sub 5.77}Fe{sub 0.23}O{sub 19.77} and Li{sub 4}Sr{sub 3}Nb{sub 6}O{sub 20}
- Univ. du Maine, Le Mans (France)
The authors have synthesized two new lithium-containing oxides which are related to Ruddlesden-Popper phases, Li{sub 4}Sr{sub 3}Nb{sub 5.77}Fe{sub 0.23}O{sub 19.77} and Li{sub 4}Sr{sub 3}Nb{sub 6}O{sub 20}, with partial occupancy of the 12-coordinated sites by Sr, for the first time by direct solid-state reaction. While the single crystal and powder X-ray diffraction data indicate that these oxides crystallize in tetragonal cells (space group I4/mmm; a = 3.9585(2) {angstrom}, c = 25.915(3) {angstrom} and a = 3.953(2) {angstrom}, c = 26.041(5) {angstrom} for the respective oxides), the electron diffraction of some of the crystallites shows supercell reflections with a {approx} {radical}2a{sub p}, c {approx} 25.9 {angstrom}, probably indicating a twisting of the NbO{sub 6} octahedra in the ab-plane. Although, these oxides show no significant lithium ionic conduction at room temperature, they show distinct conductivity values at elevated temperatures.
- OSTI ID:
- 338382
- Journal Information:
- Chemistry of Materials, Vol. 11, Issue 3; Other Information: PBD: Mar 1999
- Country of Publication:
- United States
- Language:
- English
Similar Records
Structural chemistry and electronic properties of the n = 3 Ruddlesden-Popper phases Ca{sub 4}Mn{sub 2}FeO{sub 9.75} and Sr{sub 4}Mn{sub 2}FeO{sub 9.80}
In situ X-ray and neutron diffraction of the Ruddlesden–Popper compounds (RE2–xSrx)₀.₉₈(Fe₀.₈Co₀.₂)1–yMgyO4–δ (RE=La, Pr): Structure and CO₂ stability