Growth and possible size limitation of quality single-grain YBa2Cu3O7

Meng, R. L.; Gao, Li; Gautier-Picard, P.; Ramı́rez, D.; Sun, Yanyi; Chu, C. W.

doi:10.1016/0921-4534(94)90792-7

Cited by 92 publications

(36 citation statements)

References 20 publications

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“…In the top-seeded melt-texturation method [3], one parallelepiped single crystal of e.g. NdBa 2 Cu 3 O 7-x is often used as the seed material.…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

“…The texturing during growth difficulty is reduced by using, e.g. a magnetic field [1][2][3][4][5][6]. Two main advantages of the seed method are (i) that large monodomains can be grown up to a few centimeter wide and (ii) the orientation of the sample can be controlled by adjusting the orientation of the seed before the thermal cycle.…”

Section: Introductionmentioning

confidence: 99%

“…Two main advantages of the seed method are (i) that large monodomains can be grown up to a few centimeter wide and (ii) the orientation of the sample can be controlled by adjusting the orientation of the seed before the thermal cycle. In fact, disks and toroids have already been made through single or multi seeding techniques [3][4][5][6]. For deciding about the quality of a sample, beside comparing the microstructure of various samples one relies on measurements, like the (I,V) characteristics, the electrical resistance and the Meissner effect.…”

Section: Introductionmentioning

confidence: 99%

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Magneto-transport characterization of Dy123 monodomain superconductors

et al. 2005

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The following report considers textured materials of the DyBa 2 Cu 3 O 7 type seeded with a Nd123 seed as initiator. They are grown with an excess 20% Dy211 phase on a Dy 2 O 3 substrate. We report chemical characterizations, electrical resistivity, thermoelectric power and thermal conductivity over a broad temperature range as a function of an applied magnetic field up to 6 T. We show that specific features appear on the magneto thermal transport properties different in these materials from those found in single crystals and polycrystalline samples. We propose that two vortex regimes can be distinguished in the mixed phase, -due to the intrinsic microstructure. We calculate the viscosity, entropy and figure of merit of the samples.

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“…In the top-seeded melt-texturation method [3], one parallelepiped single crystal of e.g. NdBa 2 Cu 3 O 7-x is often used as the seed material.…”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magneto-transport characterization of Dy123 monodomain superconductors

et al. 2005

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“…In general, seeded melt processed samples exhibit greatest microstructural uniformity in the vicinity of the single crystal SmBa 2 Cu 3 O 7-δ seed placed on the sample surface prior to processing although this homogeneity decreases with distance from the seed position [9]. This fabrication technique minimizes the number of grain boundaries in the sample, although it may lead to an optimum individual pseudo-crystal size for specimens which exhibit uniformly high critical current densities [22].…”

Section: Textured (Re)-ba-cu-o [(Re)bco] High Temperature Superconducmentioning

confidence: 99%

Growth features and intergranular connectivity of melt processed YBCO

Lo¹,

Dewhurst²,

Cardwell³

et al. 1996

Applied Superconductivity

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Large grain melt processed Y-Ba-Cu-O (YBCO) samples have been prepared by seeded and unseeded growth techniques. The current carrying ability within individual grains and across grain boundaries has been investigated and correlated with features in the microstructure of samples fabricated by both techniques. The development of an inhomogeneous, cell-like growth microstructure in seeded samples at distances ≈4 mm from the seed is related to a saturation in inclusion density and volume proportion of Y 2 BaCuO 5 (Y211) particles. A significant decrease in critical current density is associated with this change over a wide temperature range. The resistance of high angle c-axis grain boundaries is observed to depend critically on the magnitude of the injection current whereas the intragranular resistance is not influenced significantly by this variable. J c of a grain boundary fabricated by unseeded melt growth is estimated to be less than 100 A cm -2 at 77 K in zero applied field, which is more than two orders of magnitude lower than the intragranular J c . Field screening measurements suggest that low angle grain boundaries do not form weak links between grains in modest magnetic fields and hence do not present a significant barrier to current flow.

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“…Over the past thirty years, therefore, there has been a concerted effort world-wide to develop these materials for practical applications [6][7][8][9]. The superconducting properties of the bulk (RE)BCO superconductors have improved significantly over this period due primarily to the development of melt processing techniques, such as top seeded infiltration growth (TSIG) or top seeded melt growth (TSMG) [10][11][12][13][14][15], to fabricate grain boundary-free, large, single grain superconductors. Indeed, these processes have led to the generation of a world record trapped field 17.6 T between a stack of two GdBCO bulk single grain samples at 26 K [7].…”

Section: Introductionmentioning

confidence: 99%

A novel pre-sintering technique for the growth of Y–Ba–Cu–O superconducting single grains from raw metal oxides

Shi

Dennis

et al. 2017

Supercond. Sci. Technol.

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Most established top seeded melt growth (TSMG) processes of bulk, single grain Y-Ba-Cu-O (YBCO) superconductors are performed using a mixture of pre-reacted precursor powders. Here we report the successful growth of large, single grain YBCO samples by TSMG with good superconducting properties from a simple precursor composition consisting of a sintered mixture of the raw oxides. The elimination of the requirement to synthesize precursor powders in a separate process prior to melt processing has the potential to reduce significantly the cost of bulk superconductors, which is essential for their commercial exploitation. The growth morphology, microstructure, trapped magnetic field and critical current density, J c , at different positions within the sample and maximum levitation force of the YBCO single grains fabricated by this process are reported. Measurements of the superconducting properties show that the trapped filed can reach 0.45 T and that a zero field J c of 2.5 × 10 4 A cm −2 can be achieved in these samples. These values are comparable to those observed in samples fabricated using pre-reacted, high purity commercial oxide precursor powders. The experimental results are discussed and the possibility of further improving the melt process using raw oxides is outlined.

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Growth and possible size limitation of quality single-grain YBa2Cu3O7

Cited by 92 publications

References 20 publications

Magneto-transport characterization of Dy123 monodomain superconductors

Magneto-transport characterization of Dy123 monodomain superconductors

Growth features and intergranular connectivity of melt processed YBCO

A novel pre-sintering technique for the growth of Y–Ba–Cu–O superconducting single grains from raw metal oxides

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