What is it about?
The behavior of the modulated structure in the single crystals of Bi-232 ferrates, which are isostructural with su- perconducting Bi-2212 cuprates, depending on the variation of the Bi and Sr content has been investigated by X-ray diffraction methods, electron microscopy and Mossbauer spectroscopy. It has been shown that in the synthesis a molar ratio Bi:Sr differs always from 2:2, there are the excess of Bi and deficiency of Sr.
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Why is it important?
The increase in the Bi concentration relative to the optimal composition leads to the increase in the modulation wave vector q and the modulation becomes incommensurate. The deviation of the Bi concentration from the optimal composition results in the increase in the value of quadrupole splitting (QS) of the main doublet of the Mossbauer spectrum, the increase in the distortion of environment of Fe atoms occurs.
Perspectives
The problems of the influence of structure modulations on physical properties of a substance are open. The experimental data for understanding the nature and mechanism of the modulated structure formation are important.
Dr Bagautdin Bagautdinov
Read the Original
This page is a summary of: Relationship between the structure modulation and cation non-stoichiometry in the “Bi-232” ferrate, Physica C Superconductivity, September 2002, Elsevier,
DOI: 10.1016/s0921-4534(01)01317-x.
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