NMR and EPR spectroscopic
studies of fluorinated Bi-2212 HTSC
Chem.
Met. Alloys 6
(2013) 163-169
https://doi.org/10.30970/cma6.0254
S.A. NEDILKO, A.A. ASHUEV, V.V. TRACHEVSKY, E.G. ZENKOVICH
NMR and EPR
spectroscopy were used to analyse the structural
changes caused by fluorination in Bi-2212 HTSC
compounds. Synthesis of the fluorinated HTSC was
carried out by a solid state method, using different fluorinating agents. The
dependence of structural and superconducting properties on the nature and
concentration of the fluorinating agent was explored. It was shown that
substitution of fluorine for oxygen takes place in different preferred
positions of the Bi-2212 lattice for different fluorinating agents;
substitution in the {CuO2} layers, with formation of {CuO3F}
and {CuO2F2} structural blocks, occurs in the best way
when using PbF2, CuF2, BiOF and
SrF2 as fluorinating agents. An increase of Tc was observed for
the same fluorinating agents when added in optimal amounts.
Unit cell content of the structure
of Bi‑2212
Keywords
HTSC / Bi-2212 / Fluorination /
Fluorinating agents / NMR / EPR