Zz. Sheng et al., RAPID SYNTHESIS OF NEARLY-PURE HIGH T-C SUPERCONDUCTOR HGBA2CUO4-PRESSURE IN AN OPEN SYSTEM(DELTA AT AMBIENT), Solid state communications, 95(5), 1995, pp. 277-280
Nearly-pure 1201-type cuprate HgBa2CuO4+delta was successfully synthes
ized at ambient pressure in an open system, and was characterized by p
owder x-ray diffraction analyses and by resistance and ac susceptibili
ty measurements. The lattice parameters are a = 3.8742(5) Angstrom and
c = 9.4798(11) Angstrom, and the T-c,T-onset is up to 95 K. The resul
ts of the present experiment are instructive to the understanding of t
he formation mechanism of Hg-based superconductors, and thus to the pr
eparation of existing Hg-based superconductors and to the search for n
ew Hg-based high T-c superconductors.