The anionic superconductor Bi[sub 3]BaO[sub 5. 5]: A bcc structure closely related to the perovskite. Relationships with anti [alpha]-AgI
- Universite da Caen (France)
- Politecnico di Torino, Turin (Italy)
The average bcc structure of Bi[sub 3]BaO[sub 5.5] (a = 4.3822(2) [angstrom]) has been determined by powder neutron diffraction. The calculations performed in the space group Im3m have shown that the Bi and Ba atoms are statistically distributed over the 2(a) sites (0,0,0), whereas oxygen and anionic vacancies are statistically distributed over the 6(b) sites (1/2,0,0). The cationic positions and the large anisotropic thermal factors of the oxygen atoms resemble the anti [alpha]-AgI structure. However, the anionic positions correspond to those observed in the perovskite. Thus, contrary to Cd[sub 0.79]Cd[sub 0.21]O[sub 1.39], this phase cannot be considered as an anti [alpha]-AgI structure. It can better be described as the coexistence of the two configurations of the perovskite inside the crystals. Ionic conductivity measurements show that this phase is an anionic conductor with an activation energy of 0.90 eV and T[sub 673 K] [approximately] 10[sup [minus]3] [Omega][sup [minus]1] cm[sup [minus]1].
- OSTI ID:
- 6661330
- Journal Information:
- Journal of Solid State Chemistry; (United States), Vol. 109:1; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mid-IR and far-IR investigation of AgI-doped silver diborate glasses
Synthesis and characterization of perovskite-type Sr{sub x}Y{sub 1−x}FeO{sub 3−δ} (0.63≤x<1.0) and Sr{sub 0.75}Y{sub 0.25}Fe{sub 1−y}M{sub y}O{sub 3−δ} (M=Cr, Mn, Ni), (y=0.2, 0.33, 0.5)
Related Subjects
BARIUM OXIDES
IONIC CONDUCTIVITY
PHASE STUDIES
BISMUTH OXIDES
ACTIVATION ENERGY
ANIONS
CUBIC LATTICES
SUPERCONDUCTORS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BISMUTH COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY
IONS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
360602* - Other Materials- Structure & Phase Studies
360606 - Other Materials- Physical Properties- (1992-)