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- W2118869436 abstract "The synthesis of the HgBa2CaCu2O6+δ (Hg-1212) superconductor under various experimental conditions in sealed silica tubes is reported. Optimization of synthesis conditions allowed the preparation of bulk superconducting Hg-1212 with Tc onset at 127 K and lattice parameters a=3.858 Å, c=12.68 Å. The neutron powder diffraction analysis yielded δ=0.22(4). As a result of different atmosphere annealings a relationship between the decrease of Tc and the increase of the lattice parameter a is deduced. A 300°C/10 h treatment in 99% N2/1% O2 reduces Tc to 123 K and increases the a parameter to 3.862 Å. An additional 10 h reduction in a 100% N2 flow lowers Tc to 98 K while a increases to 3.865 Å. Subsequent oxidation at 300°C for 10 h in O2 flow restores the lattice parameters and Tc onset to their original values. The Tc dependence on annealing conditions is shown to be reversible." @default.
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- W2118869436 date "1993-11-01" @default.
- W2118869436 modified "2023-10-18" @default.
- W2118869436 title "Synthesis and structural characterization of the 127 K HgBa2CaCu2O6.22 superconductor" @default.
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- W2118869436 doi "https://doi.org/10.1016/0921-4534(93)90327-m" @default.
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