Va. Alyoshin et al., SYNTHESIS OF MONOPHASE HGBA2CUO4-PRESSURE(DELTA UNDER CONTROLLED PARTIAL OXYGEN), Physica. C, Superconductivity, 255(3-4), 1995, pp. 173-179
A reproducible method of synthesis of monophase HgBa2CuO4+delta is des
cribed. The synthesis is carried out in sealed silica tubes under cont
rolled partial oxygen pressure. The best results were obtained within
the [0.012-0.15] bar partial oxygen pressure range at 800 degrees C. M
ixtures of transition metal oxides, Co3O4/CoO or CuO/Cu2O, were used t
o promote the exact regulation of the partial internal oxygen pressure
.