Critical-current density in sintered high-Tc (Bi, Pb)-Sr-Ca-Cu-Oxide

Chen, D.-X.; Mei, Yu; Luo, H. L.

doi:10.1016/0921-4534(90)90349-j

Cited by 55 publications

(21 citation statements)

References 12 publications

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“…33,34 Treating the ͑H m , T͒ data measured by this susceptometer, the strong link between Bi 2 Sr 2 Ca 2 Cu 3 O y grains ͑J c Ϸ 10 4 A / cm 2 at T =97 K͒ was predicted. 35 Research later concentrated on ͑H m , f͒ of sintered hightemperature superconductors at T = 77 K. In this case, since the entire coil assembly is immersed in liquid nitrogen, H m may be easily increased to 3 ϫ 10 4 A / m, so that both the intergranular J c and the properties of the grains can be studied. [36][37][38] For tapes, films, rings, and disks with high J c , the high-field ac susceptometer mentioned above 12 allows H m to be as large as 10 5 A / m.…”

Section: E Materials Research Using Homemade Ac Susceptometers Calibmentioning

confidence: 99%

Calibration of low-temperature ac susceptometers with a copper cylinder standard

Chen

Skumryev

2010

Review of Scientific Instruments

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A high-quality low-temperature ac susceptometer is calibrated by comparing the measured ac susceptibility of a copper cylinder with its eddy-current ac susceptibility accurately calculated. Different from conventional calibration techniques that compare the measured results with the known property of a standard sample at certain fixed temperature T, field amplitude H m , and frequency f, to get a magnitude correction factor, here, the electromagnetic properties of the copper cylinder are unknown and are determined during the calibration of the ac susceptometer in the entire T, H m , and f range. It is shown that the maximum magnitude error and the maximum phase error of the susceptometer are less than 0.7% and 0.3°, respectively, in the region T = 5 -300 K and f = 111-1111 Hz at H m = 800 A / m, after a magnitude correction by a constant factor as done in a conventional calibration. However, the magnitude and phase errors can reach 2% and 4.3°at 10 000 and 11 Hz, respectively. Since the errors are reproducible, a large portion of them may be further corrected after a calibration, the procedure for which is given. Conceptual discussions concerning the error sources, comparison with other calibration methods, and applications of ac susceptibility techniques are presented.

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Section: E Materials Research Using Homemade Ac Susceptometers Calibmentioning

confidence: 99%

Calibration of low-temperature ac susceptometers with a copper cylinder standard

Chen

Skumryev

2010

Review of Scientific Instruments

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“…4) of χ (χ ) roughly shows the value of f g for the sample. This criterion has been implied by some other researchers [14,15], too. Hence we have estimated the value of f g to be 0.45 and 0.56, respectively, for the sample A and B by the above procedure of calculation of the matrix susceptibility.…”

Section: Resultsmentioning

confidence: 85%

AC susceptibility study in the single-phase Bi-2223 system

et al. 2005

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We have found that the composition, Bi1.2Pb0.33Sr1.54Ca2.06Cu3Oy which is comparatively poorer in Bi and Sr with respect to 2 : 2 : 2 : 3, a single-phase 110 K superconductor can be obtained. Such polycrystalline samples have been synthesized by two different methods. The synthesized samples have been characterized by their X-ray diffraction patterns and temperature dependence of DC electrical resistivity and AC susceptibility down to 20 K have been carried out. The samples have been identified as having single phase with a sharp transition. The results of their AC susceptibility have been analysed using Clem's critical state model. The effective volume fraction of the grains and the temperature dependence of the intergranular current density have been estimated.

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“…According to the single-phase description, both the 2212 and the 2223 phase should contribute with a highly superconducting grain component and with a poorly superconducting matrix component, but in the investigated temperature range both the 2212 phase components are in the normal non-diamagnetic state. On the other hand, as far as the 2223 phase is concerned, it has been shown for systems similar to ours [29,30] that at about the applied ®eld of H 200 A/m the superconductivity of the 2223 phase matrix component is strongly suppressed at least for T > 90 K. Therefore, in order to apply the two component model to our samples, it is necessary to identify the spherical grains with the 2223 phase highly superconducting grain component, while the embedding medium consists of the 2223 phase poorly superconducting matrix component, both the 2212 phase components (matrix and grains) plus, obviously, the detected impurities and voids. The request for the embedding medium to be non magnetic is full®lled by the fact that these superconducting components are in the normal state.…”

Section: Resultsmentioning

confidence: 96%

Annealing temperature dependence of the 2223 phase volume fraction in the Bi–Sr–Ca–Cu–O system

Manfredotti

Truccato

Rinaudo

et al. 2001

Physica C: Superconductivity

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We have developed a reliable method based on AC magnetic susceptibility measurements to determine the Bi 2 Sr 2 Ca 2 Cu 3 O 10x (2223) phase volume fraction and the average grain radius in multiphasic polycrystalline Bi±Sr±Ca± Cu±O samples. Precision and applicability of the method are discussed and compared with those of the XRD peak integration procedure. The method is used to investigate the in¯uence of the annealing temperature on the synthesis of the 2223 phase in air. The results show that, for a 120 h annealing time, T 849°C is the most favourable among the investigated temperatures. Evidence is also given that higher temperatures promote the decomposition of the 2223 phase into the Bi 2 Sr 2 CaCu 2 O 8x (2212) phase and impurities. Ó

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Critical-current density in sintered high-Tc (Bi, Pb)-Sr-Ca-Cu-Oxide

Cited by 55 publications

References 12 publications

Calibration of low-temperature ac susceptometers with a copper cylinder standard

Calibration of low-temperature ac susceptometers with a copper cylinder standard

AC susceptibility study in the single-phase Bi-2223 system

Annealing temperature dependence of the 2223 phase volume fraction in the Bi–Sr–Ca–Cu–O system

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