Stabilization of thallium strontium {open_quotes}1212{close_quotes} and {open_quotes}2212{close_quotes} superconducting cuprates by mercury
- Universite de Caen, Cedex (France); and others
The exploration of the system Tl-Hg-Sr-Ca-Cu-O has allowed a 2212 superconducting thallium strontium based cuprate, Tl{sub 1.5}Hg{sub 0.4}Sr{sub 2.2}Ca{sub 0.8}Cu{sub 2}O{sub 8{minus}{delta}}, to be isolated for the first time, with a T{sub c} of 25 K. In the same way, the 1212 superconducting cuprate, Tl{sub 0.88}Hg{sub 0.2{minus}}Sr{sub 2.2}Ca{sub 0.7}Cu{sub 2}O{sub 7{minus}{delta}}, with a T{sub c} of 65K has been prepared as a nearly pure phase. The combined XRD, ED, HREM, and EDS studies of these phases show the presence of an excess of strontium in the calcium sites and allows a cationic distribution to be proposed. Moreover, for intermediate compositions, one observes complex intergrowths, with T{sub c}`s ranging from 30 to 60 K. 22 refs., 11 figs., 2 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 96301
- Journal Information:
- Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 6 Vol. 7; ISSN CMATEX; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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