Comparison of the oxalate co-precipitation and the solid state reaction methods for the production of high temperature superconducting powders and coatings

Ochsenkühn-Petropoulou, Maria; Argyropoulou, Rachel; Tarantilis, Petros Α.; Kokkinos, E; Ochsenkühn, Klaus‐Michael; Parissakis, G.

doi:10.1016/s0924-0136(02)00279-0

Cited by 13 publications

(10 citation statements)

References 18 publications

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“…By using the similar refinement method, fraction of different phases (in weight percentage) in the samples was obtained. Compared to SS method, the samples prepared using COP method have higher weight percentage of Y-123 phase in agreement with previous findings [20,21]. Table 1 indicates the weight percentage of Y-123 phase for the pure SS and COP samples is 93.2% and 97.5%, respectively.…”

Section: Sample Characterizationsupporting

confidence: 89%

“…In particular, COP is a highly desirable chemical method used to prepare nanomaterials. The powders obtained by COP method show smaller grain size, higher purity, and better homogeneity compared to that obtained using SS method [20,21]. Moreover, multiple calcination and regrinding process is unnecessary to obtain a good superconducting phase for the COP method [17,22].…”

Section: Introductionmentioning

confidence: 94%

“…According to Table 2, the powders obtained by the COP method have smaller size and narrower size range (0.30-0.50 µm) in comparison with that obtained via the SS method (1.24-2.71 µm). This may be partly associated with the higher sintering temperature used in the SS method (950 • C, compared with 920 • C used for the COP method) leading to larger grain growth [21]. Figure 4 shows the temperature dependence of the real (χ') and imaginary (χ") parts of AC susceptibility (ACS) for all the samples.…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 99%

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Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

et al. 2019

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Polycrystalline samples of YBa2Cu3O7−δ (Y-123) added with x mol% of BaZrO3 (BZO) nanoparticles (x = 0.0, 2.0, 5.0, and 7.0) were synthesized using co-precipitation (COP) and solid-state (SS) method. X-ray diffraction (XRD) patterns showed the formation of Y-123 and Y-211 as the major and minor phases, respectively. The samples prepared using COP method showed higher weight percentage of Y-123 phase (≤98%) compared to the SS samples (≤93%). A peak corresponding to BZO was also found in the samples added with BZO nanoparticles. The increasing intensity of the BZO peak as the BZO amount increased showed the increasing amount of the unreacted nanoparticles in the samples. Refinement of unit cell lattice parameters indicated that all the samples have an orthorhombic crystal structure and there is no orthorhombic-tetragonal phase transformation. As observed using scanning electron microscopy (SEM), all the samples showed randomly distributed grains with irregular shape. The average grain size for the pure sample prepared using COP method is smaller (0.30 µm) compared with that of the pure SS sample (1.24 µm). Addition of 7.0 mol% BZO led to an increase of average grain size to 0.50 μm and 2.71 μm for the COP and SS samples, respectively, indicating grain growth. AC susceptibility (ACS) measurement showed a decrease in the onset critical temperature, Tc-onset with BZO addition. Comparatively, Tc-onset for the COP samples is higher than that of the SS samples. The value of Josephson’s current, Io increased up to 2.0 mol% BZO addition, above which the Io decreased more drastically for the SS samples. The value of Io is 53.95 μA and 32.08 μA for the 2.0 mol% BZO added SS and COP samples, respectively. The decrease of Io is attributed to the distribution of BZO particles at the grain boundaries as also reflected in the drastic decrease of phase lock-in temperature, Tcj. As a result of smaller average grain size, the presence of more grain boundaries containing insulating BZO particles led to lower Io in the COP samples.

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Section: Sample Characterizationsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 94%

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 99%

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Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

et al. 2019

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“…The traditional synthesis routes of these materials are often lengthy, and require highly specific conditions in order to produce the desired product. Long processing times and multi-stage heating protocols are a feature of many solid-state syntheses 6 and carefully-controlled oxygen atmospheres are invariably required in the post annealing steps. 7 It has been shown that biopolymers, such as sodium alginate, can be utilised in the production of superconducting materials with novel or hitherto unavailable morphologies such as nanowires 8 and microfibers.…”

mentioning

confidence: 99%

Synthesis of spherical superconductors

Boston

Carrington²,

Walsh

et al. 2013

CrystEngComm

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“…The following co-precipitation process has been adapted in order to obtain Dy-211 particles from the synthesis method proposed by Ochsenkühn-Petropoulou et al [25] for Y-123 (co-precipitation of oxalic salts). In this process, an oxalic acid solution is rapidly added to a solution containing dysprosium, barium and copper nitrate salts.…”

Section: Co-precipitationmentioning

confidence: 99%

Investigation of DyBa₂Cu₃O_7−d superconducting domains grown by the infiltration technique starting with small size Dy-211 particles

Mathieu

Koutzarova

Rulmont

et al. 2004

Supercond. Sci. Technol.

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An infiltration and growth process is here used as an alternative to the classical top-seeded melt-textured growth process for the production of Dy-123 single-domains with finely dispersed small size Dy-211 particles. The starting materials are the 211-particles and a barium and copper rich liquid phase precursor. The infiltration and growth process allows for controlling both the spatial and size distribution of the 211-particles in the final superconducting 123-single-domain. The main parameters (set-ups, maximum processing temperature with respect to the peritectic temperature, nature of reactant, porosity of the 211 -preform) of the infiltration and growth process are discussed. Moreover, different processes of chimie douce are shown in order to produce Dy-211 particles with controlled shape and size, particles that can be used as precursors for the infiltration and growth process.

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Comparison of the oxalate co-precipitation and the solid state reaction methods for the production of high temperature superconducting powders and coatings

Cited by 13 publications

References 18 publications

Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

Synthesis of spherical superconductors

Investigation of DyBa₂Cu₃O_7−d superconducting domains grown by the infiltration technique starting with small size Dy-211 particles

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Comparison of the oxalate co-precipitation and the solid state reaction methods for the production of high temperature superconducting powders and coatings

Cited by 13 publications

References 18 publications

Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

Comparative Study on AC Susceptibility of YBa2Cu3O7−δ Added with BaZrO3 Nanoparticles Prepared via Solid-State and Co-Precipitation Method

Synthesis of spherical superconductors

Investigation of DyBa2Cu3O7−d superconducting domains grown by the infiltration technique starting with small size Dy-211 particles

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Product

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Investigation of DyBa₂Cu₃O_7−d superconducting domains grown by the infiltration technique starting with small size Dy-211 particles