Effect of Mn Substitution on the Superconducting Properties of Bi1.7Pb0.3Sr2Ca2-xMnxCu3O10+δ
Ghazala Y. Hermiz1, Bushra A. Aljurani2, Md. Ali H. Al-Beayaty3
1Ghazala Y. Hermiz, Physics Department, Baghdad University, College of Science, Baghdad, Iraq. .
2Bushra A. AL-jurani, Physics Department, Baghdad University, College of Science, Baghdad, Iraq
3MohammadAli H.AL-Beayaty, Physics Department, Baghdad University, College of Science, Baghdad, Iraq.
Manuscript received on March 26, 2014. | Revised Manuscript received on April 09, 2014. | Manuscript published on April 30, 2014. | PP: 213-217  | Volume-3, Issue-4, April 2014. | Retrieval Number:  D2950043414/2013©BEIESP

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Abstract: The present study includes the preparation of Bi1.7Pb0.3Sr2Ca2-xMnxCu3O10+δ compound with x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5 by solid state reaction method. The effect of the substitution of Mn on Ca site on superconducting properties has been investigated to obtain the optimum conditions for the formation and stabilization of the high Tc phase. Energy dispersive X-ray spectroscopy (EDX) analysis was used to test the proportions and energies of the elements of the compound. The crystal structure was examined by XRD for all superconductor samples; it was found that the crystal structure was orthorhombic and all major peaks in the spectra could be pointed to 2223-phase with amount of 2212-phase ; a small volume fraction of impurities like Ca2CuO3, Cu O and Sr2Ca2Cu7Oδ were noticed in some samples. The highest Tc obtained for Bi1.7Pb0.3Sr2Ca2-xMnxCu3O10+δ composition was 118K for the sample with x=0.3.Scanning electron microscopy (SEM) has been used to identify the morphology of the superconducting phase and to investigate the influence of substitution effect of Mn on Ca site .The microstructure shows plate –like layered with increasing of voids and defect for samples with x=0.1,0.2,while the grains become smaller with disappear of grain boundaries of sample with x=0.3.
Keywords: Bi-based superconductors ,Mn substitution, Scanning electronic microscopy.