SUPERCONDUCTIVITY WITH T-C-GREATER-THAN-130 K IN HGBA2CA2CU3O8+X AND HGBA2CA3CU4O10+X

Superconducting samples of the homologous Mercury cuprate series HgBa2 Can-1CunO2n+2+x with n=3 and n=4 have been synthesized at high pressur e and studied. Superconducting transition temperatures T-c=132 K (n=3) and 131 K (n=4) have been obtained; these are the temperatures for th e onset of the transition to the superconducting state in measurements of the magnetic susceptibility. The lattice constants of the compound s synthesized have been determined.