Effect of Magnetic Elements Substitution on the Intergranular Properties of Bi-Based Superconductors
The effects of magnetic elements substitution for calcium position in the Bi₁.₆Pb₀.₄Sr₂(Ca₁₋ₓMₓ)Cu₃Oδ with M=Pr, Nd, Sm, Gd, Dy or Ni and x=0.0- 0.10 system , prepared by the conventional solid state reaction method have been investigated by means of structural , transport and magnetic methods....
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| Format: | Thesis |
| Language: | English English |
| Published: |
2003
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/9548/1/FSAS_2003_19_A.pdf |
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| Summary: | The effects of magnetic elements substitution for calcium position in the
Bi₁.₆Pb₀.₄Sr₂(Ca₁₋ₓMₓ)Cu₃Oδ with M=Pr, Nd, Sm, Gd, Dy or Ni and x=0.0-
0.10 system , prepared by the conventional solid state reaction method have
been investigated by means of structural , transport and magnetic methods.
The samples were sintered in air at 855°C for 150 hours followed by
annealing at 830°C for 30 hours. The superconducting properties such as
volume fraction of present phases, lattice parameters, grain shape and
critical temperatures were affected by the introduction of different elements
for Ca in the system. The volume fraction of the high-Te{2223} phase
decreases and that of the low-Te(2212) phase increases with the increase of
osubstituents. As a result, the c-axis parameter decreased from 37 A to
o 30.7 A at initial substitution stages for all samples. Thus, the critical
temperature, Te decreased to that of the low-Tc(2212) phase. The
morphological aspects of the samples generally show platelet-like grains with random orientations, typically for 2212 and 2223 phase's structure. Air
annealing at 830°C for 30 hours slightly improved the physical properties of
the samples. |
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