Abstract
The synthesis of the n = 5 and n = 6 members of the HgBa 2Ca n−1 Cu n O 2 n+2+δ family are reported. Bulk samples containing either Hg-1245 or Hg-1256 as major phases were synthesized using the high-pressure high-temperature technique at 920°C and 18 kbar. The as-synthesized phases ( a = 3.8547(3) A ̊ , c = 22.156(5) A ̊ for n = 5 and a = 3.8516(1) A ̊ , c = 25.232(6) A ̊ for n = 6 ) exhibited T c with onsets of about 100 K. They were characterized by X-ray powder diffraction, transmission electron microscopy and AC susceptibility measurements. Heat treatments increased the T c onset to 110 K for n = 5 and to 107 K for n = 6. These phases with high n are more inert to thermal annealing under different atmospheres than the members with smaller n. Only strong oxidizing { P(O 2) ≥ 500 bar} or reducing {Ar/400 °C} condition can induce significant T c variations.
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