Structure and refinement of the composition of Bi-Sr-Ca-Cu oxide crystals
Journal Article
·
· Crystallography Reports
The composite structure of the red phase, which accompanies the 2212 and 2201 superconducting phases prepared upon cooling of a melt in the Bi-Sr-Ca-Cu-O system, is revealed by scanning electron microscopy and X-ray diffraction analysis. The matrix component in two crystals I and II under investigation has a monoclinic structure with space group C2/m and the unit cell parameters a = 21.832(2) and 21.8142(9) Angstrom-Sign , b = 4.3809(4) and 4.3771(2) Angstrom-Sign , c = 12.9430(12) and 12.9378(6) Angstrom-Sign , {beta} = 102.832(2) Degree-Sign and 102.839(1) Degree-Sign , and V = 1207.0(2) and 1204.45(9) Angstrom-Sign {sup 3}, respectively. The composition is described by the general formula Bi{sub 4}(Ca{sub 2-x}Sr{sub 1.5+x})O{sub 9.5} with x = 0.13(2) for crystal I and x = 0.19(2) for crystal II. The matrix contains intergrowing clusters of the composition Cu{sub 2}O. It is demonstrated that the presence of the second component is structurally justified by the commensurability of the systems of body-centered subcells of cations in the host matrix and anion sublattices in the structure of the Cu{sub 2}O oxide.
- OSTI ID:
- 22054329
- Journal Information:
- Crystallography Reports, Journal Name: Crystallography Reports Journal Issue: 2 Vol. 53; ISSN CYSTE3; ISSN 1063-7745
- Country of Publication:
- United States
- Language:
- English
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