Effect of stanum doping and heat treatment on Bi-Sr-Ca-Cu-O superconducting ceramics
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 highes...
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| Format: | Thesis |
| Language: | English English |
| Published: |
1999
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/8657/1/FSAS_1999_12_IR.pdf http://psasir.upm.edu.my/id/eprint/8657/ |
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| Summary: | 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. |
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