Synthesis of high temperature superconducting ceramics by oxalate coprecipitation from non-aqueous solvents

Skirius, Stephen A.; Mathias, H.; Hascicek, Y. S.; Shankle, G. E.; Clark, Ronald J.

doi:10.1016/0964-1807(94)90030-2

Cited by 5 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The preparation of YBCO superconducting powder using oxalate coprecipitation in ethanol medium was investigated by Yamamoto et al [94]. The precipitation of oxalates in acetone medium was observed to change the dielectric character of the solution significantly, which greatly modified the solubility of the oxalate compounds [95]. The preparation of oxalate precursors in the acetic acid solution was also observed to yield YBCO (123) superconductors with correct composition [96].…”

Section: Oxalate Precipitationmentioning

confidence: 99%

A review on the synthesis of Y–Ba–Cu-oxide powder

Pathak¹,

Mishra²

2005

Supercond. Sci. Technol.

View full text Add to dashboard Cite

The preparation of Y–Ba–Cu-oxide (YBCO) powder by various techniques is critically reviewed and the synthesis of ultrafine superconducting YBa2Cu3Ox(123) powders is specially emphasized. The fine powder has assumed a large importance, requiring the minimization of processing parameters (time and temperature) during calcination, homogenization and sintering to avoid the problems of evaporation of the constituent oxides. From the voluminous research activities on YBCO it is known that by adopting any preparation technique the superconducting transition temperature (Tc) value of ≈92 K could be achieved in the bulk samples, thus in this review the Tc values are not emphasized. Also, the other transport properties such as critical current densities (Jc) and magnetic properties are not discussed, since these properties are mainly controlled by many other parameters related to the weak link across the grain boundaries of the specimens, and a very little role is played by the synthetic procedure. The weak links across the grain boundaries are known to be the cause for the poor Jc values in bulk specimens and those weak links are observed due to the presence of impurities at the grain boundaries, misorientation of grains and oxygenation of the samples. By selecting the proper synthetic procedure, only the impurity problem can be solved, and to remove the other problems, a proper fabrication method needs to be adopted. This review will guide the new researcher to find the appropriate technique to synthesize good quality YBCO powder.

show abstract

Section: Oxalate Precipitationmentioning

confidence: 99%

A review on the synthesis of Y–Ba–Cu-oxide powder

Pathak¹,

Mishra²

2005

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…For the microemulsion product, the initial weight loss corresponded to the dehydration of precipitates which occurred between 30 and 120 • C (loss P1); the second loss, attributed to the excess surfactant CTAB decomposition, occurred around 280 • C (P2); the third loss, attributed to oxalate decomposition, occurred in the range 300-650 • C (P3). Finally, a small weight loss above 650 • C may be due to the decomposition of barium carbonate [20]. When the heating temperature was above 700 • C, all the contaminants (approximately 50%) were removed from the precipitates.…”

Section: Producing Y211mentioning

confidence: 99%

Nanoscale Y₂BaCuO₅particles for producing melt-textured YBCO large grains

Vipulanandan

et al. 2006

Supercond. Sci. Technol.

View full text Add to dashboard Cite

In this study, nanosized Y 2 BaCuO 5 (Y211) particles were synthesized by using the microemulsion method. The water-in-oil (w/o) microemulsion system constituted of n-octane, cetyltrimethylammonium bromide (CTAB), butanol and water. The effects of the reaction time and heat treatment on the Y211 particle size were studied. SEM and TEM investigations indicate that the average particle size of the synthesized Y211 was less than 110 nm. Melt-textured superconducting yttrium barium copper oxides (YBCOs) were fabricated by using the synthesized nanosized Y211 powder with and without Pt doping. Trapped field and critical current density (J C ) were enhanced in the melt-textured YBCO as a result of using the nanosized Y211 as the starting precursor.

show abstract