Dy-211 content dependence of superconductivity in a single-domain Dy-123 system

Yoshizawa, Shuji; Sato, Takashi; Ohta, Hiromichi; Hirano, S.; Hishinuma, Yoshimitsu; Kohayashi, S.; Fujimoto, Hiroyuki; Nakane, Hiroshi

doi:10.1088/0953-2048/18/2/040

Cited by 10 publications

(9 citation statements)

References 10 publications

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“…The c axis of the crystal is almost perpendicular to the surface of the bulk sample. The structured characterization for the superconductors which we have fabricated was observed using x-ray diffraction (XRD) and scanning electron microscope (SEM) [5], [6]. and were estimated from the magnetization measurements, using a vibrating sample magnetometer (VSM) [5], [6].…”

Section: B Characterizationmentioning

confidence: 99%

“…Dy-123 bulk superconductor, therefore, is expected for large-scale applications such as flywheels, magnetic bearings, and magnetic separation, etc. We have studied superconducting properties of melt-textured bulks of Dy-123 system with molar ratios of Dy Dy [5], [6]. Both and trapped magnetic field increased with the amount of Dy-211 [5].…”

Section: Introductionmentioning

confidence: 99%

“…We have studied superconducting properties of melt-textured bulks of Dy-123 system with molar ratios of Dy Dy [5], [6]. Both and trapped magnetic field increased with the amount of Dy-211 [5]. Manuscript It should be noted that the mechanical properties in highoxide superconductors are very crucial for industrial applications.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Mechanical Properties of Large Single Domain DyBaCuO Superconductor

Fujimoto

Shimada²,

Yoshizawa³

2008

IEEE Trans. Appl. Supercond.

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We prepared large single domain of DyBaCuO (Dy-123) superconductor for future applications such as a superconducting flywheel for energy storage system, magnetic separation, and a bulk magnet. Dy-123 superconductors are expected to have high and trapped field properties. Melt-textured single domain of Dy-123 system superconductor about 48 mm in diameter and 10 mm in thickness was fabricated with a seeding and temperature gradient method in air. Dy-123 and Dy-211 powders were mixed in a molar ratio of 1:0.3, and Ag 2 O of 10 wt% and Pt of 0.5 wt% were added to the mixture. The maximum trapped magnetic field over the bulk was approximately 0.2 T at 77.3 K. We also discussed mechanical properties such as the bending stress, the hardness and the surface roughness of the Dy-123 bulk. Mechanical property results showed important information for evaluating Dy-123 bulks.

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Section: B Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation and Mechanical Properties of Large Single Domain DyBaCuO Superconductor

Fujimoto

Shimada²,

Yoshizawa³

2008

IEEE Trans. Appl. Supercond.

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“…Dy-123 and Dy-211 powders were mixed in the molar ratio of 1/0.3 [7]. Since Ag 2 O addition is effective in lowering the melting point and improving the mechanical strength, Ag 2 O powder of 10 wt% was added to the mixture.…”

Section: Sample Preparationmentioning

confidence: 99%

“…In the previous papers [6][7][8], superconducting properties of melt-textured bulk of Dy-123 system with different molar Dy-123/Dy-211 ratios was studied. Here, both J c and trapped magnetic field increased with the amount of Dy-211.…”

Section: Introductionmentioning

confidence: 99%

Trapped magnetic field of 48 mm diameter single-domain Dy-123 system superconductor

Shimada

Fujimoto

Yamazaki

et al. 2008

J. Phys.: Conf. Ser.

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Abstract. Since melt-textured rare earth (RE)-system superconducting bulk can trap high magnetic field, it acts as a quasi-permanent magnet stronger than conventional permanent magnets. Large-sized single-domain DyBa 2 Cu 3 O x (Dy-123) system bulks about 48 mm in diameter and 15 mm in thickness were prepared with a seeding and temperature gradient method in air. Dy-123 and Dy 2 BaCuO 5 (Dy-211) powders were mixed in molar ratios of 1:0.3. The pellets were partially melted at 1,070 o C. When the top temperature of the sample reached 980 o C, Nd-123 seed crystal was placed on the top surface of the bulk. Then, the samples were cooled from 980 o C to 930 o C, and then with furnace cooling. Finally, the samples were annealed in pure oxygen atmosphere. When magnetic field of 1.5 T was applied to the samples, the maximum trapped magnetic field of 0.7 T was trapped at 77.3 K in the samples prepared with the cooling time for 600 hr and 700 hr from 980 o C to 930 o C. Only 0.2 T was trapped in the sample prepared with the cooling time for 1,000 hr, whose bottom part was decomposed due to long time heating. IntroductionThe melt-textured DyBa 2 Cu 3 O x (Dy-123) system superconductors which were grown by means of a top seeding and temperature gradient method have high potential for superconductivity applications, since they exhibit higher critical current density (J c ) in high magnetic field compared to melt-textured YBCO superconductors [1][2][3][4]. It was reported that high magnetic field of 1.9 T was trapped at 77.3 K in the presence of 7 T applied parallel to the c-axis for Dy-123 bulk superconductor [5], A large-sized single-domain Dy-123 Superconductor, therefore, is expected for large-scale applications, flywheels, magnetic bearings, magnetic separation, etc.In the previous papers [6][7][8], superconducting properties of melt-textured bulk of Dy-123 system with different molar Dy-123/Dy-211 ratios was studied. Here, both J c and trapped magnetic field increased with the amount of Dy-211. And single-domain bulks, 48 mm in diameter and 15 mm in thickness, were prepared in air. When magnetic field of 1.5 T was applied to the sample, 0.7 T was trapped at 77.3 K. In this report, we investigated the effect of the cooling rate from 980 o C to 930 o C on

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