The Malaysian Journal Of Analytical Sciences Vol 16 No 1 (2012): 12 – 17

 

 

 

FORMATION AND CHARACTERIZATION OF (Tl,M)Sr1212

(M= Bi, Pb, Cr) SUPERCONDUCTING CERAMICS

 

(Penyediaan dan Pencirian Superkonduktor Seramik (Tl,M)Sr1212

(M= Bi, Pb, Cr))

 

A. Ali Yusuf, A.K. Yahya and F. Md. Salleh*

 

Faculty of Applied Sciences,

Universiti Teknologi MARA, 40450 Shah Alam, Selangor

 

*Corresponding author: faizah163@salam.uitm.edu.my

 

 

Abstract

The derivatives of Tl1212 phase superconductors were prepared using precursors derived from coprecipitation reaction of appropriate stoichiometric metal acetates and oxalic acid based on nominal starting compositions; Tl_0.8Bi_0.2Sr₂Ca_0.8Y_0.2Cu₂O₇, Tl_0.5Pb_0.5Sr_1.8Yb_0.2CaCu₂O₇ and Tl_0.9Cr_0.1Sr₂Ca_0.9Pr_0.1Cu₂O₇. The oxalates precursors were calcined at 600 ^oC for 24 hours following which sintering were done at 870 ^oC for 1 hour. All three superconducting oxides showed metallic normal state properties with T_{c onset} of around 100 ^oC and T_{c zero} of between 90 –94 ^oC. The transport critical current density (J_c) of the samples are around 3 – 6 A/cm² while the room temperature resistivity (r_{300 K}) values are in the range of  7 – 10 mWcm. Powder X-ray diffraction (XRD) patterns of all samples reveals presence of dominant 1212 phase. Scanning electron micrographs reveal fine and irregular shaped grains (<2 mm).

 

Keywords: Tl1212 superconductor, coprecipitation method

 

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