Investigation of high-energy ultrasonication of RE2BaCuO5(RE = Y, Gd) on the growth and superconducting properties of REBa2Cu3O7−δtop-seeded melt textured bulks

Naik, S. Pavan Kumar; Hagiwara, Rikako; Ishibashi, Shinnosuke; Asano, Natsuki; Ishida, Shigeyuki; Koblischka, Michael Rudolf; Koblischka-Veneva, Anjela; Tsuchiya, Y.; Kawashima, Kenji; Eisaki, H.; Nishio, Toshiyuki

doi:10.1088/1361-6668/ac6f8b

Cited by 4 publications

(3 citation statements)

References 61 publications

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“…An optical analysis of several of these images using the software ImageJ reveals a mean grain size of 207 nm, which is considerably smaller than the bulk materials studied in [12], but significantly larger than that of the nanowires analyzed in [33,34]. In order to create an uniform particle distribution, an ultrasound treatment analogous to the report in [44] will be useful, but was not tried for the first test samples prepared here.…”

Section: Microstructurementioning

confidence: 94%

Functional LSMO foams for magneto-caloric applications

Koblischka,

Koblischka-Veneva,

Schmauch

2024

Appl. Phys. A

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The ferromagnetic La$$_{1-x}$$ 1 - x Sr$$_{x}$$ x MnO$$_3$$ 3 (LSMO) manganites are ideal materials for magneto-caloric applications due to their high Curie temperature. Here, we prepare open-cell, porous LSMO foams starting from a commercial polyurethane (PU) foam and commercial LSMO powder with $$x = 0.3.$$ x = 0.3 . The cut PU foams are then covered by a slurry of LSMO powder mixed with PVA and water, and then, the foams are subjected to a heat-treatment with two steps at 600 $$^\circ$$ ∘ C (burn-off organic material) and 1200 $$^\circ$$ ∘ C (sintering/compacting). The resulting ceramic LSMO foams are then characterized by X-ray, SEM, electron backscatter diffraction (EBSD) orientation mapping and magnetic measurements. The foam sample consists of randomly-oriented LSMO grains with an average grain size of 188 nm, being distinctly smaller than bulk samples of the same composition, but considerably larger than LSMO nanowires prepared by electrospinning. The magnetic data reveal a high Curie temperature like the bulk samples, and an entropy change, $$-\Delta S_{\text{M}}$$ - Δ S M slightly higher than that of the bulk samples, which points to a strong influence of the LSMO grain size. Thus, the resulting LSMO foam material is well suited for magneto-caloric applications at room temperature.

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Section: Microstructurementioning

confidence: 94%

Functional LSMO foams for magneto-caloric applications

Koblischka,

Koblischka-Veneva,

Schmauch

2024

Appl. Phys. A

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“…Thus, it will be a useful improvement to better control the size of the Y-211 particles employed in the first step and to make them more reactive in the following IG processing, e.g., by an ultrasound treatment as discussed in Ref. [28].…”

Section: Microstructurementioning

confidence: 99%

Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure

Slimani,

Hannachi,

Koblischka-Veneva

et al. 2024

Materials

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Struts of a superconducting YBa2Cu3Oy (YBCO) foam prepared by the infiltration growth method on the base of commercial polyurethane foams were extracted from the bulk, and thoroughly characterized concerning the microstructure and the magnetoresistance, measured by the four-point technique. Optical microscopy, electron microscopy, electron backscatter diffraction and atomic force microscopy observations indicate a unique microstructure of the foam struts which shows a large amount of tiny Y2BaCuO5 (Y-211) particles (with diameters between 50 and 100 nm) being enclosed in channel-like grain boundaries between the YBCO grains and a one-of-a-kind surface of the struts covered with Ba3Cu5Oy-particles. The resistance data obtained at temperatures in the range 4.2 K ≤T≤ 150 K (applied magnetic fields ranging from 0 to 7 T) were analyzed in the framework of the fluctuation-induced conductivity (FIC) approach using the models of Aslamazov–Larkin (AL) and Lawrence–Doniach (LD). The resulting FIC curves reveal the presence of five distinct fluctuation regimes, namely, the short-wave (SWF), one-dimensional (1D), two-dimensional (2D), three-dimensional (3D), and critical (CR) fluctuation domains. The analysis of the FIC data enable the coherence length in the direction of the c-axis at zero-temperature (ξc(0)), the irreversibility field (Birr), the upper critical magnetic field (Bc2), the critical current density at T= 0 K (Jc(0)) and several other parameters describing the the material’s superconducting properties to be determined. The present data reveal that the minuscule Y-211 particles found along the YBCO grain boundaries alter the excess conductivity and the fluctuation behavior as compared to conventional YBCO samples, leading to a quite high value for Jc(0) for a sample with a non-optimized pinning landscape.

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“…Thus, it will be an useful improvement to better control the size of the Y-211 particles employed in the first step and to make them more reactive in the following IG processing, e.g., by an ultrasound treatment as discussed in Ref. [27].…”

Section: Microstructurementioning

confidence: 99%

Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure

Slimani,

Hannachi,

Koblischka-Veneva

et al. 2024

Preprint

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Struts of a superconducting YBa2Cu3Oy (YBCO) foam prepared by the infiltration growth method on the base of commercial polyurethane foams were extracted from the bulk, and thoroughly characterized concerning the microstructure and the magnetoresistance, measured by the four-point technique. Optical microscopy, electron microscopy, electron backscatter diffraction and atomic force microscopy observations indicate an unique microstructure of the foam struts which shows a large amount of tiny Y2BaCuO5 (Y-211) particles (with diameters between 50–100 nm) being enclosed in channel-like grain boundaries between the YBCO grains and an one-of-a-kind surface of the struts covered with Ba3Cu5Oy-particles. The resistance data obtained at temperatures in the range 4.2 K ≤T≤ 150 K (applied magnetic fields ranging from 0 to 7 T) were analyzed in the framework of the fluctuation-induced conductivity (FIC) approach using the Aslamazov-Larkin model. The resulting FIC curves reveal the presence of five distinct fluctuation regimes, namely, the short-wave (SWF), one-dimensional (1D), two-dimensional (2D), three-dimensional (3D), and critical (CR) fluctuation domains. The analysis of the FIC data enable the coherence length in the direction of the c-axis at zero-temperature (ξc(0)), the lower and upper critical magnetic fields (Bc1, Bc2), the critical current density at T= 0 K (Jc(0)) and several other parameters describing the the material’s superconducting properties to be determined. The present data reveal that the minuscule Y-211 particles found along the YBCO grain boundaries alter the excess conductivity and the fluctuation behavior as compared to conventional YBCO samples, leading to a quite high value for Jc(0) for a sample without added flux pinning centers.

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Investigation of high-energy ultrasonication of RE₂BaCuO₅(RE = Y, Gd) on the growth and superconducting properties of REBa₂Cu₃O_7−δtop-seeded melt textured bulks

Cited by 4 publications

References 61 publications

Functional LSMO foams for magneto-caloric applications

Functional LSMO foams for magneto-caloric applications

Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure

Excess Conductivity Analysis of an YBCO Foam Strut and Its Microstructure

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