Separation and Characterization of Superconducting YBa2Cu3O7-x Powder

Hayashi, K.; Yokota, Yasuhiro; Morita, Shuji; Hanada, Noriaki; Hayashi, Shin-ichiro

doi:10.1143/jjap.27.1856

Cited by 8 publications

(2 citation statements)

References 10 publications

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“…From the literature, it was reported that the calcination and wet milling times were the critical parameters for the efficient purification of YBCO powder [59]. The superconducting YBCO (123) phases could also be sorted out using Meissner-Ochsenfeld effect [60][61][62]. In this separation technique, powder cooled at ≈80 K is allowed to drop slowly from a pinhole and is then passed through a magnetic field gradient generated by two permanent magnets.…”

Section: Calcination Of Precursorsmentioning

confidence: 99%

A review on the synthesis of Y–Ba–Cu-oxide powder

Pathak¹,

Mishra²

2005

Supercond. Sci. Technol.

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The preparation of Y–Ba–Cu-oxide (YBCO) powder by various techniques is critically reviewed and the synthesis of ultrafine superconducting YBa2Cu3Ox(123) powders is specially emphasized. The fine powder has assumed a large importance, requiring the minimization of processing parameters (time and temperature) during calcination, homogenization and sintering to avoid the problems of evaporation of the constituent oxides. From the voluminous research activities on YBCO it is known that by adopting any preparation technique the superconducting transition temperature (Tc) value of ≈92 K could be achieved in the bulk samples, thus in this review the Tc values are not emphasized. Also, the other transport properties such as critical current densities (Jc) and magnetic properties are not discussed, since these properties are mainly controlled by many other parameters related to the weak link across the grain boundaries of the specimens, and a very little role is played by the synthetic procedure. The weak links across the grain boundaries are known to be the cause for the poor Jc values in bulk specimens and those weak links are observed due to the presence of impurities at the grain boundaries, misorientation of grains and oxygenation of the samples. By selecting the proper synthetic procedure, only the impurity problem can be solved, and to remove the other problems, a proper fabrication method needs to be adopted. This review will guide the new researcher to find the appropriate technique to synthesize good quality YBCO powder.

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Section: Calcination Of Precursorsmentioning

confidence: 99%

A review on the synthesis of Y–Ba–Cu-oxide powder

Pathak¹,

Mishra²

2005

Supercond. Sci. Technol.

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“…Soon after the discovery of superconductivity in the YBa 2 Cu 3 O x phase, several groups [1][2][3][4][5] applied magnetic separation procedures to obtain powder materials of increased phase purity. Separation was effective because of a magnetic field gradient ∇ H acting on an assembly of superconducting grains cooled below T c .…”

Section: Introductionmentioning

confidence: 99%

Theory of high gradient attractive magnetic separation of superconducting materials and its experimental verification by YBa₂Cu₃O_xparticles

Dessauges

Willems

Favre

et al. 2006

Supercond. Sci. Technol.

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The calculation of trajectories for sedimenting diamagnetic particles shows that superconducting matter in the Meissner or vortex state can be captured sidewise to a ferromagnetic wire magnetized perpendicular to its length. Capture is possible for externally applied fields lower than typical critical fields H c1 (c), H c1 (a, b) of cuprates. For single crystalline particles in the vortex state, the magnetic anisotropy may reduce the capture force because of alignment. Theoretical predictions were confirmed experimentally for suspensions of polycrystalline and single crystalline particles of YBa 2 Cu 3 O x (size range: 2-125 µm) in liquid nitrogen. As a general conclusion we find that for the extraction of superconducting particles out of combinatorial ceramic reaction mixtures, separation in the Meissner state might be most effective because of the presence of an excess of normal state matter featuring a much lower diamagnetic susceptibility.

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A “Single‐Sample Concept” (SSC): A New Approach to the Combinatorial Chemistry of Inorganic Materials

Hulliger

Awan

2004

Chemistry A European J

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Combinatorial estimations show that, within an unreacted ceramic sample prepared by mixing N different starting materials MxOy with average particle size approximately 1 microm, there are about 10(12) grains per cubic centimeter, sufficient for local reactions to occur that may produce a larger number of product oxides than presently accessible by 2D plate techniques. The "single-sample concept" (SSC) is proposed for performing property-directed syntheses for the preparation of ferri-/ferromagnetic or superconducting compounds. Because of the magnetic properties of the products, libraries of product grains can be sorted by means of magnetic separation techniques. For materials with a large magnetization, the separation efficiency is so high that traces of products can be isolated. The SSC concept was tested experimentally to prepare Fe-based oxides (N=17, 24, 30). The large yields (<75 wt %, N=17) of product grains agree with the literature data, which indicate that 3d metal magnetic oxide phases (Tc>300 K) are most probably Fe oxides. In combination with magnetic separation techniques, SSC seems particularly adapted for exploring the solid-state chemistry of metallic lead elements that form ferri-/ferromagnetic or superconducting oxide phases difficult to detect systematically within the large phase space of theoretically existing compounds.

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Separation and Characterization of Superconducting YBa₂Cu₃O_7-x Powder

Cited by 8 publications

References 10 publications

A review on the synthesis of Y–Ba–Cu-oxide powder

A review on the synthesis of Y–Ba–Cu-oxide powder

Theory of high gradient attractive magnetic separation of superconducting materials and its experimental verification by YBa₂Cu₃O_xparticles

A “Single‐Sample Concept” (SSC): A New Approach to the Combinatorial Chemistry of Inorganic Materials

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Separation and Characterization of Superconducting YBa2Cu3O7-x Powder

Cited by 8 publications

References 10 publications

A review on the synthesis of Y–Ba–Cu-oxide powder

A review on the synthesis of Y–Ba–Cu-oxide powder

Theory of high gradient attractive magnetic separation of superconducting materials and its experimental verification by YBa2Cu3Oxparticles

A “Single‐Sample Concept” (SSC): A New Approach to the Combinatorial Chemistry of Inorganic Materials

Contact Info

Product

Resources

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Separation and Characterization of Superconducting YBa₂Cu₃O_7-x Powder

Theory of high gradient attractive magnetic separation of superconducting materials and its experimental verification by YBa₂Cu₃O_xparticles