The ferrites Bi{sub n+1}Sr{sub 2n+2}Ba{sub n-1}Fe{sub n+1}O{sub 6n+4}: A series of intergrowths of the 2201 and 0201 structures
Journal Article
·
· Journal of Solid State Chemistry
- Universite de Caen (France); and others
A new series of layered ferrites with the ideal formula Bi{sub n+1}Sr{sub 2n+2}Ba{sub n-1}Fe{sub n+1}O{sub 6n+4} has been synthesized. The ED and HREM studies of these phases show that they represent the three first members of a series of intergrowths of the 2201 (Bi{sub 2}Sr{sub 2}CuO{sub 6}-type) and 0201 (k{sub 2}NiF{sub 4}-type) structures. The parameters of their tetragonal cells are related to the a{sub p} parameter of the perovskite and to the c{sub 2201} and C{sub 0201} parameters in the following way: a{approx} 1/2 (c{sub 0201} + n.c{sub 2201}) for the odd-n members or c {approx} c{sub 0201}+n.c{sub 2201} for the even-n members. The key point of this study deals with the stabilization of these structures by introducing barium on the bismuth sites. Problems of nonstoichiometry on the cationic sites in the bismuth layers and of oxygen nonstoichiometry are discussed. The disappearance of the modulation of the structure by introducing barium, as is in the 2212 cuprate Bi{sub 1.5}Ba{sub 2.5}LaCu{sub 2}O{sub 8.25}, is also evidenced and interpreted in terms of space for the 6s{sup 2} lone pair of Bi(III).
- OSTI ID:
- 210080
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 118; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
Similar Records
Bi{sub 12}Sr{sub 22}Fe{sub 11}O{sub 56}: A new form of 2201/0201 'terraces' like structures, term m=6, n=11 of the [BiO{sub 2}]{sub m}[Sr{sub 2}FeO{sub 4}]{sub n} family
The aptitude of barium and bismuth to form layered cuprates: Bi sub 2 Ba sub 2 minus x La sub x CuO sub 6+. delta. , a 2201-type structure. [Title compound is not a superconductor]
Neutron diffraction study of the nonmodulated 2212-type cuprate Bi{sub 1.5}Ba{sub 2.5}LaCu{sub 2}O{sub 8.25}
Journal Article
·
Fri Apr 15 00:00:00 EDT 2005
· Journal of Solid State Chemistry
·
OSTI ID:20725882
The aptitude of barium and bismuth to form layered cuprates: Bi sub 2 Ba sub 2 minus x La sub x CuO sub 6+. delta. , a 2201-type structure. [Title compound is not a superconductor]
Journal Article
·
Mon Jun 01 00:00:00 EDT 1992
· Journal of Solid State Chemistry; (United States)
·
OSTI ID:6999246
Neutron diffraction study of the nonmodulated 2212-type cuprate Bi{sub 1.5}Ba{sub 2.5}LaCu{sub 2}O{sub 8.25}
Journal Article
·
Sat Oct 01 00:00:00 EDT 1994
· Journal of Solid State Chemistry
·
OSTI ID:508695