Modulated structures and intergrowth in Pb-doped Bi-Sr-Ca-Cu-O superconducting oxides
- Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080 (People's Republic of China) Beijing Laboratory of Electron Microscopy, Chinese Academy of Sciences, P.O. Box 2724, Beijing 100080 (People's Republic of China)
Modulated structures and intergrowths in superconducting phases of nominal (Bi{sub 1{minus}{ital x}}Pb{sub {ital x}}){sub 2}Sr{sub 2}Ca{sub 2}Cu{sub 3}O{sub 10} (2:2:2:3) compounds have been studied by transmission electron microscopy. Three kinds of modulations have been observed, one is a two-dimensional modulation and the other two are one-dimensional modulations with superspace groups {ital N} 1{bar 1}1{sup {ital B}{ital b}{ital m}{ital b}} (no. 66a), {ital P}{sup {ital Bbml}}{sub 1{bar 1}1} (no. 66a). The space group of the average structure of the two-dimensional modulated structure is {ital Bbmb}, and its Bravais class is {ital C}{sup {ital Cmmm}}{sub 1{ital p}112} in a two-line symbol or {ital C}{sub {ital m}{ital m}{ital m}}(1,0,{gamma};0,0,{nu}) (no. 2-24) in a one-line symbol. It is found that phases with the same point group and similar structure (forming intergrowths) have the same modulation. Intergrowths with each of the three modulations have been observed. The next highest member of the structural series, the 2:2:3:4 phase, has been found as having intergrowths. On the basis of the modulations of the intergrowths being the same, the modulations in the 2:2:3:4 phase have been determined.
- OSTI ID:
- 6484489
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Vol. 42:7; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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ORDER-DISORDER TRANSFORMATIONS
SPACE GROUPS
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OXYGEN COMPOUNDS
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360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies