Preparation and structural investigation of Bi{sub 16}(Sr,Ca){sub 14}O{sub 38}
Journal Article
·
· Journal of the American Ceramic Society
OSTI ID:483655
- National Inst. of Standards and Technology, Gaithersburg, MD (United States). Ceramics Div.
- Univ. of Arizona, Tucson, AZ (United States). Dept. of Material Science and Engineering
Single-crystal X-ray diffraction was used to investigate the structure of the ternary oxide of approximate formula Bi{sub 14}(Sr,Ca){sub 12}O{sub 33}. The crystal examined was found to have a composition Bi{sub 2}Sr{sub 0.68}Ca{sub 1.07}O{sub 4.75} or Bi{sub 16}Sr{sub 5.44}Ca{sub 8.56}O{sub 38} as a result of refinement. It crystallizes in the monoclinic space group (C2/m), with cell parameters a = 21.764 (4) {angstrom}, b = 4.3850 (13) {angstrom}, c = 12.905 (3) {angstrom}, {beta} = 102.72 (2){degree}, and V = 1,201.2 (5) {angstrom}{sup 3}. Strontium and calcium ions were found to substitute for each other. The structure consists of a network of alkaline-earth oxide polyhedra with broad channels parallel to the b axis, in which the bismuth ions reside. Two out of four crystallographically distinct Bi ions form infinite Bi-O zigzag ribbons of edge-inked Bi-O units, while each of the other two form oxygen corner-shared Bi-O chains along b. The lone pair electrons of the Bi ions point toward each other in the channels.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- OSTI ID:
- 483655
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 2 Vol. 80; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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