What is it about?
The influence of the extra Sr layer introduced into Bi2Sr3Fe2O9 (the obtained Bi2Sr4Fe2O10 compound) on the structure modulation has been investigated by X-ray diffraction analysis, electron microscopy and Mössbauer spectroscopy. It has been found that the obtained single crystals are characterized by the averaged orthorhombic cell with the lattice parameters a=5.4227(7) Å, b=5.4248(8) Å and c=18.600(3) Å and two-component modulations of the structure with the vector (0,1/4.97,1/2). The real structure of the compound consists of domains tilted relative to each other by 90° around the c-axis.
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Why is it important?
In contrast to the intensively studied superconducting compounds Bi-2223, Bi-2212 and Bi-2201, the structure of the Bi-2222 (242) compound is poorly investigated. It can be partially related to the problem of growth of single crystals of the desired quality. In the literature, there are only powder X-ray diffraction data for the averaged structure of the Bi-2222 cuprate and the Bi-242Fe ferrate. Up to now the data on the investigation of single crystals of the Bi-242Fe ferrate are absent.
Perspectives
The satellites of the second and third with respect to the main reflections were observed. It has been also found the commensurate modulation component along the c-axis.
Dr Bagautdin Bagautdinov
Read the Original
This page is a summary of: The structure modulation in the Bi2Sr4Fe2O10 compound, Physica C Superconductivity, June 2001, Elsevier,
DOI: 10.1016/s0921-4534(00)01775-5.
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