Zn and Ga substitution in superconducting YBa2Cu4O8

✍ Scribed by S.P. Pandey; M.S. Hegde; B.V. Kumaraswamy; A.V. Narlikar

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 675 KB
• Volume: 206
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(93)90516-s

✦ Synopsis

We have presented the results of Zn and Ga substitution in place of Cu in YBa,&Os (Y-124). The samples of YBaZ(Cu,_,Zn,)40s with x=0.00-0.20 and YBaZ(Cu,_,GaX)dOs with x=0.01-0.10 were synthesised at ambient oxygen pressure using sodium oxalate. With increase in concentration of Zn in Y-124 no significant change is observed in the values of the lattice parameters a,,, b. and co. With Ga substitution in Y-124, a,, and b0 values tend to come closer and the c, parameter decreases, resulting in decreased orthorhombicity of the unit cell. It is observed that Zn substitution in Y-124 depresses the T,(R=O) at a faster rate compared to Ga substitution in this system.

The results are compared with the reported data for the YBa2Cu@_a system.