Hashim @ Ismail, Azhan (1999) Effect Of Stanum Doping and Heat Treatment on Bi-Sr-Ca-Cu-O Superconducting Ceramics. PhD thesis, Universiti Putra Malaysia.
The influence of Sn doping in calcium (Ca) and copper (Cu) sItes either temperature for 30 hours soaking time were studied For Sn-free sample. heat treatment improved the superconducting transition temperature, TC(RI)) from 100 K to 104 K, when the sintered sample was annealed at 820°C The highest Tc(R=0) of 104 K was observed for sintered sample (x=0 02) with simultaneous doping The heat treatment improved the Tc(R=0) from 60 K to 94 K or sample doped 111 Ca site when re-sintered at 855°C and from 66 K to 100 K for sample doped with Sn in Cu site when annealed at 840°C For simultaneous doping, the T C(R 0) dId not change significantly after heat treatment except for sample with x=0 05 that showed drastic improvement of T C(R=U) from 64 K (sintered) to above 100 K From XRD analysis, the volume of 2223 phase decreased as the Sn concentration increased A ll samples with Sn concentration above x=0 10 contall1ed unknown peaks which con respond to the non-superconducting phase although the lattice parameter of the samples shortened, the crystallographic structure remained in the tetragonal form.
|Item Type:||Thesis (PhD)|
|Chairman Supervisor:||Associate Professor Abdul Halim bin Shaari, PhD|
|Call Number:||FSAS 1999 12|
|Faculty or Institute:||Faculty of Environmental Studies|
|Deposited By:||Nurul Hayatie Hashim|
|Deposited On:||08 Dec 2010 08:39|
|Last Modified:||08 Nov 2012 03:56|
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