Influence of pelletization pressure on magnetic susceptibility samples of ceramics Bi (Pb)–Sr–Ca–Cu–O

Fradina, I.A.; Алексеев, А. И.; Gridasova, T.Ja.; Морозов, В. В.; Jurchenko, D.O.

doi:10.1016/s0921-4534(98)00563-2

Cited by 16 publications

(15 citation statements)

References 2 publications

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“…The theoretical density of BPSCCO system is about 6.3 g/cm 3 obtained from the lattice parameters [17]. The density of the pellets prepared in this work were determined to be 5.0725 g/cm 3 ; 5.1675 g/cm 3 ; 5.2682 g/cm 3 ;…”

Section: Fig 4 Variation Of C-axis As a Function Of Applied Pressurementioning

confidence: 82%

“…12. Densities obtained by water displacement technique were in the 80-87% range of theoretical density calculated from the lattice parameters to be 6.3 g/cm 3 . The densities of pellets were calculated to be in the 3.78-4.50 g/cm 3 range from dimensional measurements.…”

Section: System IImentioning

confidence: 85%

“…Fradina et Table 1 The critical temperature T c,zero (K), T c,onset (K), T c (K) and mass density of the samples for System I Sample Pressure (MPa) al. [3] found that the pressure of pelletization of samples in the 100-500 MPa interval does not influence the speed of formation of 2223 phase. The quality of grain contacts in samples pelletized at pressures 100, 200, 300 MPa is rather bad, probably because of a non-uniform diffusion of atoms.…”

Section: System Imentioning

confidence: 94%

“…By using this method, obtained densities of pellets were 5.0716 g/cm 3 for sample A, 5.2607 g/cm 3 for sample B, 5.4284 g/cm 3 for sample C, 5.4874 g/cm 3 for sample D and 5.4018 g/cm 3 for sample E, and are shown in Fig. 12.…”

Section: System IImentioning

confidence: 99%

“…The existence of two basic superconducting phases 2223 and 2212 in the system, extent of formation of the non-superconducting phases, quality of contacts between grains, and the arrangement of grains in space to a certain extent depend on various parameters. The atomic ratio of elements in the structure, method of the homogenization of the structure, compaction pressure of the powders for the 2223 phase formation, time and temperature of the final heat treatment processing step are among these parameters [3]. The grains in the polycrystalline microstructure must orient along a certain direction which often is referred to as texturing for the preparation of high-T c superconductors with anisotropic physical properties for achieving a large critical current density.…”

Section: Introductionmentioning

confidence: 99%

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

Kocabaş

Gökçe

Çiftçioğlu

et al. 2009

J Supercond Nov Magn

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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.

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Section: Fig 4 Variation Of C-axis As a Function Of Applied Pressurementioning

confidence: 82%

Section: System IImentioning

confidence: 85%

Section: System Imentioning

confidence: 94%

Section: System IImentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Kocabaş

Gökçe

Çiftçioğlu

et al. 2009

J Supercond Nov Magn

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Effects of Texturing Mechanisms on the Critical Current Density in Sintered High-Tc Bi-2223 Superconductors

Ozogul

Aydinuraz

2001

phys. stat. sol. (a)

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Ac susceptibility measurements on ceramic samples with the nominal composition of Bi 1:8 Pb 0:4 Sr 2 Ca 2 Cu 3 O 10Àd prepared by various pressing pressures on the pellets (355, 533, 711 and 1067 MPa) and different directional cooling temperature rates (20, 10, and 5 C/h) using a directional solidification approach with a stationary Pt crucible in a strong temperature gradient have been carried out. The intergranular critical current density (J cm ) distribution has been calculated from ac susceptibility measurements by using Bean's and Kim's critical state models. It is observed that the critical current density improved with increasing pressing pressure and decreasing directional cooling temperature rates.

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Effect of pelletization pressure on structural properties and critical current hysteresis of ceramic superconducting Bi1.7Pb0.3Sr2Ca2Cu3Oy

Tepe

Avci

Abukay

2003

phys. stat. sol. (a)

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The effect of pelletization pressures on structural properties and critical current hysteresis of Bi 1.7 Pb 0.3 Sr 2 Ca 2 Cu 3 O y samples was investigated. The samples used in this study were prepared by classical solid-state reaction at the pressures from 100 up to 500 MPa. The obtained samples were characterized by resistance vs. temperature, (R-T), critical current density vs. applied magnetic field, (J c -H), material density vs. pressure, (ρ -P), XRD, SEM, and EDAX. The results of this study showed that the quality of electrical and structural properties of Bi-2223 bulk superconductors strongly depends on the pelletization pressure. Pressing of bulk samples at 400 MPa produces textured grain alignment and associates microstructural modifications in order to enhance flux pinning and thus increases current carrying capacities.

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Influence of pelletization pressure on magnetic susceptibility samples of ceramics Bi (Pb)–Sr–Ca–Cu–O

Cited by 16 publications

References 2 publications

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

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

Effects of Texturing Mechanisms on the Critical Current Density in Sintered High-Tc Bi-2223 Superconductors

Effect of pelletization pressure on structural properties and critical current hysteresis of ceramic superconducting Bi1.7Pb0.3Sr2Ca2Cu3Oy

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