Abstract
The samples of Bi2Sr2Ca2Cu3-xMnxO10+δ (x = 0.0 to 0.30) were prepared by the standard solid-state reaction method. The phase identification characteristics of synthesized (HTSC) materials were explored through powder X-ray diffractometer reveals that all the samples crystallize in orthorhombic structure with lattice parameters a = 5.4053 Å, b = 5.4110 Å and c = 37.0642 Å up to Mn concentration of x = 0.30. The critical temperature (Tc) measured by standard four probe method has been found to depress from 108 K to 70 K as Mn content (x) increases from 0.00 to 0.30. The effects of sintering temperature on the surface morphology of Bi2Sr2Ca2Cu3-xMnxO10+δ have also been investigated. The surface morphology investigated through scanning electron microscope and atomic force microscopy (SEM & AFM) results that voids are decreasing but grains size increases as the Mn concentration increases besides, nanosphere like structures on the surface of the Mn doped Bi2Sr2Ca2Cu3-xMnxO10+δ (Bi-2223) samples.
Highlights
One of the most effective ways to extend the search for new materials in high temperature superconductors (HTSCs) with improved physical properties is to replace some cations or anions by other elements at various sites of known systems such as Bi2Sr2Ca2Cu3-xMnxO10+δ (Bi- 2223)
The Scanning Electron Micrographs (SEM) micrographs reveal that the grain size increases as the concentration of Mn increases from x = 0.0 to 0.30, besides few pores are seeing in figure 4(a)–4(d)
We have carried out a systematic investigation of the structural, surface morphology for Mn-doped Bi2Sr2Ca2Cu3-xMnxO10+δ (Bi-2223) samples
Summary
One of the most effective ways to extend the search for new materials in high temperature superconductors (HTSCs) with improved physical properties is to replace some cations or anions by other elements at various sites of known systems such as Bi2Sr2Ca2Cu3-xMnxO10+δ (Bi- 2223) Since it has been regarded as the most promising member and significant progress has been achieved in the development of this material[1,2,3,4,5] in recorded time. Provides an interesting prospect of the possible interplay of magnetism and superconductivity occurring in the HTSC materials.[32] On the other hand, many other studies have indicated that defects, grain boundaries and even the chemical doping can improve the electrical properties e.g. critical current density ‘Jc’ by creating extra flux pinning center and even the mechanical properties of superconductors It has been reported[33,34] that the transition temperature (Tc) as deduced from electrical resistivity by substituting Mn impurities at Cu sites. With these goals in mind, in this paper we have studied the effects of the partial substitution of Mn at Cu-site within the low solubility regime (0 ≤ x ≤ 0.30) on microstructural characteristics, physical properties (Tc, Jc etc.) of Bi1.6Pb0.4Sr2Ca2Cu3-xMnxO10+ δ
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