Enhancement of critical current density in HgBa2Ca2Cu3O8+δ superconductor doped by Sb

Li, J.Q.; Lam, C.C.; Hung, Kevin; Shen, Lin

doi:10.1016/s0921-4534(98)00286-x

Cited by 9 publications

(11 citation statements)

References 22 publications

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“…It is worthwhile to discuss the comparative influence of Sb and Pb doping, on growth marphology and critical current density. It should be pointed out that Sb doping is known to restrain the O 2 and Hg in the grains of Hg-1223 [17]. The presence of Pb is known to lower the melting point [20].…”

Section: Resultsmentioning

confidence: 99%

“…Recently effect of Sb doping in Hg-1223 has been studied by several workers [17,18]. They have found that small addition of Sb in Hg-1223 can improve the intergrain critical current density.…”

Section: Introductionmentioning

confidence: 99%

“…Although optimization of T c has been carried out by several workers [17][18][19][20], the pinning mechanism in Hg family of high temperature superconductor is not yet clear. Recently effect of Sb doping in Hg-1223 has been studied by several workers [17,18]. They have found that small addition of Sb in Hg-1223 can improve the intergrain critical current density.…”

Section: Introductionmentioning

confidence: 99%

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Influence of simultaneous doping of Sb and Pb on phase formation, superconducting and microstructural characteristics of HgBa2Ca2Cu3O8+δ

Giri¹,

Tiwari²,

Srivastava³

2007

Physica C: Superconductivity

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of simultaneous doping of Sb and Pb on phase formation, superconducting and microstructural characteristics of HgBa2Ca2Cu3O8+δ

Giri¹,

Tiwari²,

Srivastava³

2007

Physica C: Superconductivity

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“…For long needle shaped samples, such as the samples studied in this work, H 0 % H ac , where H ac is the amplitude of ac field used in ac susceptibility measurement [19]. Figure 8 is the intergrain critical current density J c versus temperature for R0, R1 and R4 calculated by the formular J c H ac ; T p H ac =R.…”

Section: The Ac Susceptibility Measurements and Intergrain Critical Cmentioning

confidence: 99%

Effect of MgO Nanorod Doping on Phase Formation and Intergrain Coupling of (Bi, Pb)-2223 Superconductors

Huang

Song

Cui

et al. 2000

phys. stat. sol. (a)

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MgO nanorods with the average diameter of 30 nm and the length of 2 to 3 mm have been incorporated into (Bi, Pb)-2223 superconductors. The differential thermal analysis (DTA) measurements show that the addition of MgO nanorods results in the lowering of the melting point of the samples, which indicates that the optimum formation temperature of (Bi, Pb)-2223 phase is reduced. X-ray diffraction (XRD) analysis manifests that a small addition of MgO nanorods does not obstruct the formation of (Bi, Pb)-2223 phase. Furthermore, the transmission electron microscopy (TEM) observation shows that the MgO nanorods do not agglomerate or grow during the sintering process, which is crucial to the further application of MgO nanorod doping in (Bi, Pb)-2223/Ag tapes. The ac susceptibility measurements indicate that a small addition of MgO nanorods enhances the intergrain critical current density J c significantly. The enhancement of J c originates from the improvement of intergrain coupling due to the MgO nanorod doping.

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“…The higher oxidation state cations also lead to hole optimization in the hole deficient as grown Hg-1223 phase, thus producing optimum critical transition temperature (T c ). A variety of cationic substitution such as Bi, Tl, Mo, Re, Sn, Pb etc have been attempted (Sun et al 1994;Shao et al 1994;Meng et al 1996;Balchev et al 1997;Chmaissem et al 1997;Li et al 1998Li et al , 1999Sastry et al 1998a;Fujii et al 1999). Even though all of them lead to enhanced chemical stability, the influence of different cationic substitutions on the superconducting properties are different.…”

Section: Introductionmentioning

confidence: 99%

Effect of cationic size in Hg(Tl/Bi)Ba2Ca2Cu3O8+δ on superconducting and microstructural characteristics

et al. 2001

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In this paper we have reported investigations on the effect of simultaneous substitution of Bi and Tl at the Hg site in the oxygen deficient HgO δ δ layer of HgBa 2 Ca 2 Cu 3 O 8+δ δ cuprate superconductor. Bulk polycrystalline samples have been prepared by the two-step solid state reaction process (precursor route). It has been observed that the as grown HgBi 0⋅ ⋅2-x Tl x Ba 2 Ca 2 Cu 3 O 8+δ δ (with x = 0⋅ ⋅00, 0⋅ ⋅05, 0⋅ ⋅10, 0⋅ ⋅15, 0⋅ ⋅20) corresponds to the 1223 phase. It has been found that the T c varies with the average cationic size of the dopant cations. The optimum T c of ~ 131 K has been found for the composition HgBi 0⋅ ⋅15 Tl 0⋅ ⋅05 Ba 2 Ca 2 Cu 3 O 8+δ δ. This composition leads to the average dopant cation size of ~ 1⋅ ⋅108 Å which is very close to the size of Hg 2+ (~ 1⋅ ⋅11 Å). The microstructure for HgBi 0⋅ ⋅15 Tl 0⋅ ⋅05 Ba 2 Ca 2 Cu 3 O 8+δ δ has been found to be most dense and this phase exhibits the highest stability. The J c of the optimum material HgBi 0⋅ ⋅15 Tl 0⋅ ⋅05 Ba 2 Ca 2 Cu 3 O 8+δ δ is found to be ~ 1⋅ ⋅29 × × 10 3 A/cm 2 at 77 K.

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Enhancement of critical current density in HgBa2Ca2Cu3O8+δ superconductor doped by Sb

Cited by 9 publications

References 22 publications

Influence of simultaneous doping of Sb and Pb on phase formation, superconducting and microstructural characteristics of HgBa2Ca2Cu3O8+δ

Influence of simultaneous doping of Sb and Pb on phase formation, superconducting and microstructural characteristics of HgBa2Ca2Cu3O8+δ

Effect of MgO Nanorod Doping on Phase Formation and Intergrain Coupling of (Bi, Pb)-2223 Superconductors

Effect of cationic size in Hg(Tl/Bi)Ba2Ca2Cu3O8+δ on superconducting and microstructural characteristics

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