The preparation of Y-Ba-Cu-O superconductor through a self-redox method

Hurng, W.‐M.; Shei, C.Y.

doi:10.1007/bf00724430

Cited by 1 publication

(4 citation statements)

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“…Normally, for the synthesis of YBa 2 Cu 3 O x powder, nitrate solutions of the cations are used [188][189][190]. Awano et al [190] investigated the role of the precursor solution on the morphology of the calcined powders.…”

Section: (D) Spray-drying Methodsmentioning

confidence: 99%

“…Synthesis of 80 nm homogeneous powders by spray drying and low-pressure calcination of the same was observed to yield good superconducting specimens [191]. The syntheses of YBCO (123) superconductors from formates [192], nitrateacetate [188,189] and oxalate [193] precursors have also been investigated. In the spray drying of formate solution, the precursor solution was prepared by dissolving Y 2 O 3 , BaCO 3 and CuO in formic acid.…”

Section: (D) Spray-drying Methodsmentioning

confidence: 99%

“…The low-temperature oxidation-reduction reaction using a spray-dried mixture of nitrate and acetate salts was reported to yield good superconducting specimens [189]. The exothermic reaction took place at <573 K in one step and converted the precursor to oxide; the enthalpy of the reaction was observed to be dependent upon the acetate content.…”

Section: (D) Spray-drying Methodsmentioning

confidence: 99%

“…[ [187][188][189][190][191][192][193][194][195] Freeze-drying process Micron-sized homogeneous powder. Require proper heating schedule to avoid segregation.…”

Section: Solution-drying Processmentioning

confidence: 99%

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

Pathak¹,

Mishra²

2005

Supercond. Sci. Technol.

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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.

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Section: (D) Spray-drying Methodsmentioning

confidence: 99%

Section: (D) Spray-drying Methodsmentioning

confidence: 99%

Section: (D) Spray-drying Methodsmentioning

confidence: 99%

“…[ [187][188][189][190][191][192][193][194][195] Freeze-drying process Micron-sized homogeneous powder. Require proper heating schedule to avoid segregation.…”

Section: Solution-drying Processmentioning

confidence: 99%

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