The interaction of Ag with Bi-Pb-Sr-Ca-Cu-O superconductor

Dou, Shi Xue; Song, Kang-Ho; Liu, H.K.; Sorrell, Charles Christopher; Apperley, M.; Gouch, A.; Savvides, N.; Hensley, D.W.

doi:10.1016/0921-4534(89)90431-0

Cited by 62 publications

(16 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some of them are related with the preparation of high homogeneous precursors with small particle sizes using different synthetic methods [2][3][4][5]. Moreover, the effect of cationic substitution, as for example Pb 2+ by Bi 3+ [6,7], or metallic additions, typically metallic Ag [8,9], have been tested. Finally, other studies have been centred on the superconducting grain alignment which leads to an important raise on the electrical transport properties due to the reduction of the number of low-angle junctions [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Postannealing Process on Bi2Sr2.1Ca0.9Cu2O8+δ Textured Superconductors

Sotelo

Madre

Rasekh

et al. 2012

J Supercond Nov Magn

View full text Add to dashboard Cite

Bi-2212 samples prepared by the classical solid-state method have been grown from the melt using the Laser Floating Zone (LFZ) method. They have shown good grain alignment and transport critical current densities (J c). After postannealing processes designed to produce the Bi-2212 phase controlled decomposition, J c values have been increased in an important manner. Maximum values have been achieved when samples were thermally treated at 680 ºC for 168 h with improvements around 80 %, compared with the original textured samples. The results clearly indicate that postannealing processes, when adequately controlled, produce the formation of effective pinning centers which are responsible for the raise in the measured J c values.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Postannealing Process on Bi2Sr2.1Ca0.9Cu2O8+δ Textured Superconductors

Sotelo

Madre

Rasekh

et al. 2012

J Supercond Nov Magn

View full text Add to dashboard Cite

show abstract

“…However, by processing in low oxygen partial pressures Ag can be used without degradation of properties. Dou et al [19] reported that Ag additions strongly react with Bi(2223) and destabilize the superconducting Table 3 The critical temperature T c,zero (K), T c,onset (K), T c (K) and mass density of the samples for System II The highest values of the offset temperature are for samples B and C. The transition width was 13 K, 10 K, 9 K, 11 K and 13 K, respectively, from sample A to E, which indicated the presence of highly pure phase structure as shown in Fig. 8.…”

Section: System IImentioning

confidence: 99%

Effect of Compaction Pressure on Structural and Superconducting Properties of Bi-2223 Superconductors

Kocabaş

Gökçe

Çiftçioğlu

et al. 2009

J Supercond Nov Magn

View full text Add to dashboard Cite

In this work, effects of compaction pressure on the structural and superconducting properties of BSCCO ceramic superconductors were investigated. The study was carried out on two systems which were, System I: Bi 1.7 Pb 0.3 Sr 2 Ca 2 Cu 3 O y and System II: Bi 1.6 Pb 0.3 Ag 0.1 Sr 2 Ca 2 Cu 3 O y , respectively. Ceramic powders were prepared by conventional solid-state reaction method and sintered at 850°C after compaction at five different pressures in the 150-750 MPa range. Critical temperatures of samples were determined by resistivity-temperature determinations made by four-point probe method in liquid nitrogen conditions. XRD analysis was conducted by powder X-ray diffraction method. Morphology of the grains present in the samples were determined by using scanning electron microscope (SEM) photographs at 2 K× and 2.5 K× magnifications for System I and System II, respectively. Sintered densities of the superconducting ceramics were measured by Archimedes water displacement method and unit cell parameters were additionally obtained from XRD data. T c values for System I was determined to be in the 109-115 K with sample D having the highest T c of 115 K while T c varied in the 104-109 K range and sample B had the highest T c value of 109 K for System II. The transition width, which is a sign of the purity of the samples, was determined to be narrow for both systems. The data obtained from X-ray diffraction measurements have shown that 2223 high-T c phase was dominant in both systems. The determination of the optimum pellet compaction pressure for BSCCO ceramic superconductors was the main purpose of this work. The results of this work indicated that compaction at around 450 MPa improves the superconducting and structural properties of the BSCCO ceramic superconductors.

show abstract

“…Previous work on powder-intube (PIT) tapes has shown that a liquid phase is neccessary to increase reaction kinetics and critical current density [2]. A similar reactive-liquid sintering approach was used in this study; however, processing temperatures were higher for bulk BPSCCO than for PIT tapes due to the absence of silver, which lowers the melting temperature of BPSCCO [3].…”

Section: Introductionmentioning

confidence: 93%