Synthesis and characterisation of the thallium-substituted superconducting cuprate Hg1−xTlxBa2Ca2Cu3O8+δ

✍ Scribed by M. Valldor; I. Bryntse; J. Barkauskas; A. Kareiva

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 226 KB
• Volume: 9
• Category: Article
• ISSN: 1616-301X
• DOI: 10.1002/(sici)1099-0712(199907/08)9:4<135::aid-amo373>3.0.co;2-s

✦ Synopsis

The objective of this research is the development of chemical routes for the preparation of hightemperature superconducting powders. A simple sol-gel synthesis technique for preparing the superconducting compound Hg 1Àx Tl x Ba 2 Ca 2 Cu 3 O 8d d d d d (Hg,Tl-1223) has been refined. A systematic study of the influence of synthesis conditions on the phase purity of the obtained superconducting material is described. We have demonstrated that superconducting Hg 1Àx Tl x Ba 2 Ca 2 Cu 3 O 8d d d d d phase of good quality can be obtained by this sol-gel synthesis method. Replacing Hg by Tl in the bulk material significantly increased the superconducting transition temperature. An as-prepared sample showed T C (onset) 136 K, but after oxygen treatment the critical temperature of Hg 1Àx Tl x Ba 2 Ca 2 Cu 3 O 8d d d d d superconductor increased to 140 K.