Abstract
Polycrystalline samples of (Tl1−xMx)SrBaCa3Cu4Oz ((Tl, M)-1234), where M = Ca, Mg and Cu, were prepared by using a solid state reaction method to find the environmentally friendly element that promotes the formation of the 1234 phase. X-ray diffraction data showed that Ca substitution was very effective in forming the 1234 phase at normal pressure, compared to either Mg or Cu substitution. Nearly single-phase samples were obtained for the nominal compositions of (Tl1−xCax)SrBaCa3Cu4Oz (0.3 ≤ x ≤ 0.5) and (Tl0.7Ca0.3)(Sr2−yBay)Ca3Cu4Oz (1.0 ≤ y ≤ 1.25). The (Tl0.7Ca0.3)(Sr2−yBay)Ca3Cu4Oz (1.0 ≤ y ≤ 1.25) samples were found to have a relatively homogeneous microstructure by scanning electron micrography. Bulk superconductivity with Tc of 102 K was observed in the (Tl0.7Ca0.3)SrBaCa3Cu4Oz sample. The experimental results suggest that Ca can be a very useful element in the charge reservoir layer to form a single-phase Tl-1234-type compound with appropriate substitution of Ba into the Sr sites in the bridging layer.
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Acknowledgements
This research was supported by the Basic Science Research Program of the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2020R111A3074529). The corresponding author (H. K. Lee) expresses his thanks to the Central Laboratory of Kangwon National University for help with XRD, SEM, and EDX measurements and to the PNU Center for its help with SQUID measurements.
Funding
This work was supported by the Basic Science Research Program of the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2020R111A3074529).
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conceptualization, investigation, writing—original draft [Ho Keun Lee]; data collection [Sangmin Park]; review—editing [Ji Won Seo]; review and editing [Roslan Abd-Shukor]. All authors have approved the submitted version of the manuscript.
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Lee, H.K., Park, S., Seo, J.W. et al. Phase formation and superconducting properties of (Tl,M)(Sr, Ba)Ca3Cu4Oz compounds with M = Ca, Mg, and Cu. J Mater Sci: Mater Electron 35, 609 (2024). https://doi.org/10.1007/s10854-024-12390-1
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DOI: https://doi.org/10.1007/s10854-024-12390-1