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Journal ArticleDOI

Superconductivity Studies on the HighTcPhase in the Y–Ba–Cu–O System

TL;DR: In this paper, the properties of the phases (i) Y2-xBaxCu2O5 (0.6) and (ii) YBa2Cu3+xO7+y ( 0.0) are reported.
Abstract: Synthesis, characterization and superconducting behavior of the phases (i) Y2-xBaxCu2O5 (0\leqslantx\leqslant1.6) and (ii) YBa2Cu3+xO7+y (0\leqslantx\leqslant2.0) are reported. The composition YBa2Cu4O7+y shows a Tc (zero resistance) of 94K.
Citations
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Journal ArticleDOI
TL;DR: In this paper, the cation concentration ratio in individual grains (1 to 25 μm) of four Y 1 Ba 2 Cu 3 O 7− z pellets was investigateda spectroscopy.

3 citations

Journal ArticleDOI
TL;DR: The effect of oxide additives on sintering and superconducting properties of YBa2Cu3O7 was studied in this article, and the best results were obtained with Bi2O3, SiO2 and Y2O 3.
Abstract: The effect of oxide additives-CuO, SiO2, Y2O3, Bi2O3 and ZnO in 1–10 mol% on the sintering and superconducting properties of YBa2Cu3O7 was studied. SEM studies indicated improvement of grain size and interconnectivity due to the additives, the best results being obtained with Bi2O3, SiO2 and Y2O3. The superconducting transition temperature is unaffected (92±2 K) even with 10 mol % of the additives. ZnO, however, decreases theT c as expected.

2 citations

Journal ArticleDOI
TL;DR: In this paper, the oxygen-deficient phase of the highTc superconductor, YBa2Cu3O7, was enriched using the fluidization technique to give good superconducting properties.
Abstract: The oxygen-deficient phase of the highTc superconductor, YBa2Cu3O7, was oxygen-enriched using the fluidization technique to give good superconducting properties. The normal method of oxygen treatment at 900°C for 24 h and at 600°C for 24 h has been reduced to just one treatment at 600°C for 12 h by the fluidization technique to achieve almost the same strength of superconducting signal for the YBa2Cu3O7 powder, which establishes the attractiveness of the latter route for the large-scale preparation of superconducting material. The particle sizes were in the range 0–90, 90–180 and 180–420 µm. The fluidized particles were crystalline with orthorhombic distortion.Tconset, estimated using the a.c. magnetic susceptibility method, was 91·3 K. The volume fraction of superconducting material in the product was 83·7–85·3%, one of the highest values reported so far for YBa2Cu3O7.

1 citations

Patent
17 Jul 1990
TL;DR: A compact superconductor of the empirical composition YBa2 Cu3 O7-x ×zCuO, in which z is a number from 0.08 to 0.84, consists of elongated crystals grown together irregularly as mentioned in this paper.
Abstract: A compact superconductor of the empirical composition YBa2 Cu3 O7-x ×zCuO, in which z is a number from 0.08 to 0.84, consists of elongated crystals grown together irregularly. It has a density of at least 5.9 g/cm3, in particular at least 6.02 g/cm3. It is prepared by mixing a fine-grained superconductor powder of the composition YBa2 Cu3 O7-x with 1 to 10% by weight of CuO, compressing the mixture under a pressure of at least 1 MPa to give a compact, and heating this compact at 940°-985° C. for at least 5 hours.
Patent
11 Feb 1993
TL;DR: In this article, a new use as high critical temperature superconductors of a known family of partially oxidized bi-metal compounds in which the two metals are copper and barium was proposed, where oxygen vacancies are located symmetrically with respect to the axes of their lattice structure.
Abstract: A new use as high critical temperature superconductors, of a known family of partially oxidized bi-metal compounds in which the two metals are copper and barium. These compounds become superconductive at least at a temperature higher than 5° K. but less than or equal to 77° K., when oxygen vacancies are located symmetrically with respect to the axes of their lattice structure.