Advanced Materials

Bulk synthesis of the 135 K superconductor HgBa2Ca2Cu3O8+δ


  • We thank the EPSRC, The Royal Society (PPE), and Merck Ltd. (GBP) for financial support.


Bulk synthesis of the high-temperature superconductor HgBa2Ca2O8+δ (Hg-1223)—an important step towards realizing its technological potential—is described. In the reaction discussed, the formation of bulk samples (up to 20 g) with excellent phase purity and transition temperatures above 130 K at ambient pressure proceeds from the binary oxides by a solid-state route. The significant advantages of this method compared to the high-pressure routes currently used are pointed out.