Tuning Pb content in high-Tc Bi(2)Sr(2)CaCu(2)Oy superconductors studied by X-ray absorption near-edge structure spectroscopy
Journal
Journal of Low Temperature Physics
Journal Volume
131
Journal Issue
3-4
Pages
613-618
Date Issued
2003
Author(s)
Abstract
The variation of hole concentration within the CuO2 planes via tuning Pb content in (Bi2-xPbx) Sr2 Ca Cu2 Oy (0.2 ≤ x ≤ 0.6) has been investigated by X-ray absorption near-edge structure (XANES) spectroscopy using synchrotron radiation. The profile of XANES spectra indicated that Pb can be incorporated into Bi-2212 phase under nitrogen atmosphere around x = 0.6. However, after annealing the nitrogen-sintered samples in oxygen, Pb solubility is found to be decreased only up to x = 0.2 in (Bi2-x Pbx) Sr2 Ca Cu2 Oy, showing that compounds with high Pb content are more stable under oxygen-free atmosphere.
Type
journal article