Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 93: Superconductivity – Poster II
TT 93.4: Poster
Donnerstag, 12. März 2026, 18:00–20:00, P4
Comprehensive Optimization of Structural Properties, Flux Pinning, and EXAFS-Revealed Local Structure in HgO-Engineered BiPb-2223 Superconductors — •Mustafa Shalaby1, Ahmed Shalaby2, Duc Tran3, An Pham3, Latif Khan4, and Messoud Harfouche4 — 1NCRRT, Egyptian Atomic Energy Authority, Cairo, Egypt. — 2Egyptian Russian University. Badr City, Cairo, Egypt — 3Faculty of Physics, VNU University of Science, Hanoi, Vietnam — 4SESAME, P.O. Box 7, Allan 19252, Jordan
A systematic investigation of HgO nanoparticle enhancement in Bi1.6Pb0.4Sr2Ca2Cu3O10 −δ (BiPb-2223) HTSC, with strategic incorporation of 1-2 wt% HgO nanoparticles demonstrates an increase in high-Tc Bi-2223 phase fraction from 69% to 78% while effectively suppressing the detrimental Bi-2212 phase. Cu K-edge EXAFS analysis unveils exceptional structural stabilization, with achieved electronic structure with Cu valence states (VCu) was 3.04, 2.87, and 3.1 for pristine and HgO-doped samples respectively, maintaining the critical Cu+2/Cu+3 mixed valence configuration necessary for superconducting behaviour in the CuO2 planes. HgO works as a structural stabilizer rather than conventional substitutional dopant, evidenced by non-uniform distribution patterns and preserved superconducting frameworks. Critical current densities reach 900 A/m2 at 10 K with irreversibility fields exceeding 100,000 Oe for the pure sample, while the 2% HgO composition exhibits optimized flux pinning force characteristics with Jc = 600 A/m2 at 10K.
Keywords: BiPb-2223 HTCS; EXAFS; Critical current density; Irreversibility field