Freeze drying preparation of YBaCuO

Lacour, Claude; Laher-Lacour, F.; Dubon, A.; Laguës, M.; Mocae̋r, Ph.

doi:10.1016/0921-4534(90)90343-d

Cited by 26 publications

(3 citation statements)

References 3 publications

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“…A variety of techniques have been reported for the processing of YBCO precursor powders including freeze-drying [15], self-propagating high-temperature synthesis [16], coprecipitation [17], sol-gel [18], spray-drying [19,20] and evaporative decomposition of solution (EDS) [21,22]. Of these, EDS appears to be a particularly attractive route for the preparation of precursor powders for melt processing.…”

Section: Introductionmentioning

confidence: 99%

Properties of Y-Ba-Cu-O powder prepared by evaporative decomposition of solution for melt-processed bulk ceramics

Smith

Cardwell

Babu

et al. 2000

Supercond. Sci. Technol.

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Y-Ba-Cu-O (YBCO) precursor powder composed primarily of YBa 2 Cu 3 O 7−δ (Y-123) and Y 2 BaCuO 5 (Y-211) containing 0.1 w/w% Pt has been prepared by the evaporative decomposition of solution (EDS) and subsequent calcination for the fabrication of bulk melt-processed ceramics. The decomposition process in the as-produced powder and the formation of the Y-123 and Y-211 phases have been studied in detail using differential thermal analysis and powder x-ray diffractometry. The morphology, microstructure and particle size distribution of the powder has been investigated using scanning electron microscopy, transmission electron microscopy and particle size analysis, and the powder has been found to contain a significant proportion of sub-micrometre-sized particles. Samples fabricated by seeded melt growth using the EDS-prepared powder have been observed to exhibit a finer distribution of the Y-211 phase than is typically obtained in similar samples prepared via a mixed oxide route. This provides direct evidence of the suitability of EDS precursor powder for the fabrication of large-grain, high-J c melt-processed YBCO monoliths.

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Section: Introductionmentioning

confidence: 99%

Properties of Y-Ba-Cu-O powder prepared by evaporative decomposition of solution for melt-processed bulk ceramics

Smith

Cardwell

Babu

et al. 2000

Supercond. Sci. Technol.

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“…A number of techniques for the processing of YBCO precursor powders have been reported in the literature, including the methods of solid-state reaction, sol-gel/solution, 15 precipitation, 16 plasma spray, 17 freeze drying, 18,19 spray drying, 20 and evaporative decomposition of solution/aerosol decomposition. 21,22 Of these, spray drying appears to be a particularly attractive route for the manufacture of precursor powder for meltprocessed YBCO.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of spray dried precursor powder for melt-processed bulk YBCO ceramics

Cardwell

Dung

et al. 1996

J. Mater. Res.

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YBa 2 Cu 3 O 72d precursor powder suitable for the fabrication of melt-processed ceramic has been prepared by spray drying and subsequent calcination. The dehydration and decomposition processes in the nitrate-based spray-dried powder and the formation processes of the YBa 2 Cu 3 O 72d and Y 2 BaCuO 5 phases have been studied in detail using thermal analysis and powder x-ray diffractometry. The morphology, microstructure, and size distribution of the particles in the calcined powder have been investigated using high resolution scanning electron microscopy and particle size analysis and found to contain a significant proportion of submicron sized particles of Y 2 BaCuO 5 . Melt-processed samples prepared using the spray-dried powder have been observed to exhibit a significantly finer distribution of the 211 phase than is typically obtained in similar specimens prepared via a mixed oxide route. This provides direct evidence of the suitability of spray-dried precursor powder for the fabrication of large grain, high J c melt-processed YBCO ceramics.

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“…a larger homogeneity of the chemical species repartitioned before sintering [4] which lowers the probability for off-stoichiometric phases to exist on a long term basis and which lowers the Kirkendall effect;…”

Section: Introductionmentioning

confidence: 99%

Electrical Properties Correlated to the Chemical and Granular Microstructures in YBaCuO Ceramics

Lacour

Laher-Lacour

Dubon

et al. 1991

Phys. Stat. Sol. (a)

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Two types of correlations between the superconducting properties and the microstructures in YBaCuO ceramics prepared by the freeze‐drying method are studied. The first one is a correlation between the critical current density Jc in zero magnetic field, the diamagnetic effect, and the anisotropy of the crystal growth. It is observed that the more the crystal growth is isotropic, the larger is the critical current at 77 K. The second one is a correlation between Jc and the chemical microstructure supported by numerous X‐ray microanalyses which show that Jc is statistically strongly dependent on the couple concentration—distribution of the CuO residual phase.

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Freeze drying preparation of YBaCuO

Cited by 26 publications

References 3 publications

Properties of Y-Ba-Cu-O powder prepared by evaporative decomposition of solution for melt-processed bulk ceramics

Properties of Y-Ba-Cu-O powder prepared by evaporative decomposition of solution for melt-processed bulk ceramics

Preparation and properties of spray dried precursor powder for melt-processed bulk YBCO ceramics

Electrical Properties Correlated to the Chemical and Granular Microstructures in YBaCuO Ceramics

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