Loading…
Crystal structure and superconductivity of Bi-2223
The crystal structure of the Bi 2 Sr 2 Ca 2 Cu 3 O 10 + x high-temperature superconductor is investigated by the X-ray Rietveld method. The results obtained are used to analyze the structural features of the bismuth high-temperature superconductors in respect to their superconducting properties. The...
Saved in:
Published in: | Crystallography reports 2009-07, Vol.54 (4), p.584-590 |
---|---|
Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | The crystal structure of the Bi
2
Sr
2
Ca
2
Cu
3
O
10 +
x
high-temperature superconductor is investigated by the X-ray Rietveld method. The results obtained are used to analyze the structural features of the bismuth high-temperature superconductors in respect to their superconducting properties. The refinement of the structure of the Bi-2223 compound in the four-dimensional space group
A
2
aa
(
a
00) 000 (
Z
= 4) with the vector
q
∼ 0.21
a
* does not reveal any indication of a modulated structure of the Bi-2212 type. The lattice parameters are 5.411(3), 5.409(1), and 37.082(1) Å. The agreement factors are
R
wp
= 8.10% and
R
p
= 5.49%. The results obtained are consistent with the notion that bismuth high-temperature superconductors are supercon-ductors with a more distorted crystal structure as compared to other representatives of high-temperature superconductors with critical temperatures
T
c
> 100 K. These distortions primarily manifest themselves in the segregation of the Bi and O ions of the “charge block” with the formation of zigzag chains that are characteristic of the structure of Bi
2
O
3
and are stimulated in particular by defects in the calcium layer. |
---|---|
ISSN: | 1063-7745 1562-689X |
DOI: | 10.1134/S1063774509040075 |