Abstract
Polycrystalline samples of HgBa2Ca1-xSrxCu2O 6+δ were prepared by solid state reaction of HgO, Ba2CuO3+δ and Ca1-xSrCuO2 (x=0.14) in an evacuated silica tube. The as-synthesized sample has a Tc of 120 K and has tetragonal symmetry ( P4 mmm) with lattice parameters of a=3.8584(1) A ̊ and c=12.6646(5) A ̊. After annealing under O2 at 250 °C for 8 h, the Tc was enhanced to 124 K. The content of oxygen uptakes is about 0.11, which was estimated by a TGA analysis. However, the X-ray powder diffraction data and the Raman spectra of both as-synthesized and oxygen-annealed samples did not show any substantial difference.
Original language | English |
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Pages (from-to) | 907-908 |
Number of pages | 2 |
Journal | Physica C: Superconductivity and its Applications |
Volume | 235-240 |
Issue number | PART 2 |
DOIs | |
State | Published - Dec 1994 |