Abstract
The introduction of the Mössbauer nuclei 57 Fe , 119 Sn and 151 Eu into Tl-based 12( n−1) n superconductors was investigated. The doped Tl-based superconductors were characterized with respect to critical temperatures, critical currents, microstructure and composition of the superconducting and secondary phases. The samples were then analyzed by Mössbauer spectroscopy. Energy dispersive X-ray (EDX) analysis showed that both 57 Fe and 151 Eu were incorporated in the superconducting crystallites. Sn was found in secondary phases. Incorporation of Eu into the superconducting phase favored the formation of the Tl-1212 phase. The isomer shift and the electric field gradient derived from the 151 Eu spectra were consistent with Eu 3+ at the Ca site. The 57 Fe Mössbauer spectra refer to two different micro-environments for the Fe 3+. They were assigned to Fe 3+ substituting Cu between the two Ca layers and between the Ca and Ba–Sr–O layers.
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