A study of the effect of KClO3 addition on the AC susceptibility and microstructure of high-temperature (Tconset at 105 K) YBCO ceramic superconductors

Veneva, A.; Iordanov, I; Toshev, Luchesar B.; Stoyanova-Ivanova, Angelina; Gogova, D.

doi:10.1016/s0921-4534(98)00344-x

Cited by 30 publications

(5 citation statements)

References 39 publications

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“…The pole figures demonstrate that the doped sample with x = 0.30 is more similar to a melttextured YBCO sample as also seen in the magneto-optical measurements [19]. These changes in crystal growth were ascribed in [17] to the presence of a liquid phase during the processing, thus enabling an oriented grain growth.…”

Section: Resultssupporting

confidence: 57%

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Application of electron backscatter diffraction to bulk high-Tc superconductors

Koblischka-Veneva

Koblischka

Simon

et al. 2002

Supercond. Sci. Technol.

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We have successfully obtained electron backscatter diffraction (EBSD) Kikuchi patterns on various bulk high-Tc superconductors (polycrystalline KClO3-doped and undoped YBa2Cu3O7−δ (YBCO), single crystalline YBCO and NdBa2Cu3O7−y) and on YBCO and NdBCO thin films. We have established a sample polishing procedure to obtain intense Kikuchi patterns without an additional carbon coating of the ceramic superconductors. We present Kikuchi patterns, pole figures and orientation maps of the samples. On the polycrystalline KClO3-doped YBCO samples we find two major orientations (001) and (100) normal to the sample surface, while the undoped sample does not exhibit any orientation maxima, which is ascribed to the effect of a liquid phase due to the KClO3-additive during the preparation process. Furthermore, we discuss the future possibilities for the application of the EBSD technique for growing larger, bulk melt-textured samples for applications.

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Section: Resultssupporting

confidence: 57%

“…Details of the sample preparation of the YBCO [17] and NdBCO bulk samples [18] are given elsewhere. For the present study, we have chosen a pure YBCO and a KClO 3 -doped sample with the nominal composition Y (1−0.2x) Ba (2−0.2x) K x Cu 3 O y (x = 0.30).…”

Section: Methodsmentioning

confidence: 99%

Application of electron backscatter diffraction to bulk high-Tc superconductors

Koblischka-Veneva

Koblischka

Simon

et al. 2002

Supercond. Sci. Technol.

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“…The improvement of the current densities within the foam struts will be the main challenge for the future development of superconducting foam samples, and a key to this will be an improvement of the texture achieved. For this purpose, the recent developments concerning the generic seed crystals [52], the IG-process [31,37], the pre-treatment of the 211 powders [53,54] and chemical doping to improve texture [55,56] will have to be applied to the fabrication of foam samples. Nevertheless, our first results are promising, so thus we may discuss possible applications of the foam samples to set directions and goals for the coming improvements.…”

Section: Resultsmentioning

confidence: 99%

Superconducting YBCO Foams as Trapped Field Magnets

et al. 2019

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Superconducting foams of YBa 2 Cu 3 O y (YBCO) are proposed as trapped field magnets or supermagnets. The foams with an open-porous structure are light-weight, mechanically strong and can be prepared in large sample sizes. The trapped field distributions were measured using a scanning Hall probe on various sides of an YBCO foam sample after field-cooling in a magnetic field of 0.5 T produced by a square Nd-Fe-B permanent magnet. The maximum trapped field (TF) measured is about 400 G (77 K) at the bottom of the sample. Several details of the TF distribution, the current flow and possible applicatons of such superconducting foam samples in space applications, e.g., as active elements in flux-pinning docking interfaces (FPDI) or as portable strong magnets to collect debris in space, are outlined.

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“…The magnetic and where the intrinsic superconducting properties of the grains are strongly modified by the grain coupling effects. The observed peculiar broadness in the χ (T ) curves could be explained due to changes in the grain orientations, grain size, and grain boundaries of Gd-123 during the process of preparation [34]. As shown from SEM micrographs, some grains are unfavorably oriented which may be the reason for broadness in the χ (T ) curves.…”

Section: Resultsmentioning

confidence: 90%

Study of the Irreversibility Line of GdBa 2Cu 3 O 7 − δ Added with Nanosized Ferrite CoFe 2 O 4

Basma

Awad

Roumié³

et al. 2015

J Supercond Nov Magn

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CoFe 2 O 4 ) x GdBa 2 Cu 3 O 7−δ superconducting samples were synthesized using a conventional solid-state reaction technique with 0 ≤ x ≤ 0.1 wt%. Characterization of the prepared samples was carried out using X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The effect of adding CoFe 2 O 4 to the Gd-123 phase, which acts as a flux pinning center, was investigated by measuring the ac magnetic susceptibility at different applied dc magnetic fields. Both the superconducting transition temperature T c and the critical current density J c increased up to x = 0.01 wt%, and then, they decreased with further increase in x. The temperature dependence of the irreversibility line was investigated by the logarithmic plot of the irreversibility field H irr versus (1 − T irr /T c (0)). This plot shows a crossover at a field of 1000 Oe, indicating 3D to 2D flux creep fluctuations. Furthermore, the H irr -T curves are well fitted according to a theoretical model proposed by Matsushita, based on the depinning mechanism caused by thermally activated flux creep.

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A study of the effect of KClO3 addition on the AC susceptibility and microstructure of high-temperature (Tconset at 105 K) YBCO ceramic superconductors

Cited by 30 publications

References 39 publications

Application of electron backscatter diffraction to bulk high-Tc superconductors

Application of electron backscatter diffraction to bulk high-Tc superconductors

Superconducting YBCO Foams as Trapped Field Magnets

Study of the Irreversibility Line of GdBa 2Cu 3 O 7 − δ Added with Nanosized Ferrite CoFe 2 O 4

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