Synthesis and characterization of YBa2Cu3O7−x. Superconducting materials

Vilminot, S.; Hadigui, S. El; Derory, A.; Drillon, Marc; Bernier, J.C.; Kappler, J.P.; Kuentzler, R.; Dossmann, Y.

doi:10.1016/0025-5408(88)90160-2

Cited by 21 publications

(45 citation statements)

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“…Hence conversion of the salt grains to oxide grains takes a long time. After the formation of oxides, the constituent ions, namely Y 3+ , Ba 2+ , Cu 2+ and O 2− , diffuse across the grain boundaries of the Y 2 O 3 , BaO and CuO grains to form the YBCO (123) compound. The reaction takes place first at the boundary of the oxide grains and later inside the grains by diffusion through the growing layers of YBCO (123) formed at the surface of the oxide grains.…”

Section: (A) Conventional Ceramic Processmentioning

confidence: 99%

“…After the formation of oxides, the constituent ions, namely Y 3+ , Ba 2+ , Cu 2+ and O 2− , diffuse across the grain boundaries of the Y 2 O 3 , BaO and CuO grains to form the YBCO (123) compound. The reaction takes place first at the boundary of the oxide grains and later inside the grains by diffusion through the growing layers of YBCO (123) formed at the surface of the oxide grains. The process can be better understood from figures 2 and 3, where the decomposition behaviour of BaCO 3 and formation reaction product are shown schematically.…”

Section: (A) Conventional Ceramic Processmentioning

confidence: 99%

“…(a) the diffusion paths become longer, leading to a decrease in the rate of formation of YBCO (123), and (b) the advancing YBCO layer presents an additional diffusion boundary to the gases being released from the interior of the grains.…”

Section: (A) Conventional Ceramic Processmentioning

confidence: 99%

“…Hence it is very difficult to obtain pure single-phase powder of multi-component oxides by this process. Further, it is difficult to separate the unreacted compounds from the product to obtain the pure YBCO (123) compound. Evaporation loss of Ba 2+ and Cu 2+ species during calcination at >1173 K is another complicating factor [18,19].…”

Section: (A) Conventional Ceramic Processmentioning

confidence: 99%

“…Most of the early investigations on YBCO (123) were carried out on the materials synthesized by reacting Y 2 O 3 and CuO with BaCO 3 [20][21][22][23]. From the quantitative x-ray analysis it was observed that a long calcination time above 1173 K was required to obtain single-phase YBCO (123) compound when BaCO 3 was used as one of the reactants.…”

Section: Selection Of Starting Precursorsmentioning

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: (A) Conventional Ceramic Processmentioning

confidence: 99%

Section: (A) Conventional Ceramic Processmentioning

confidence: 99%

Section: (A) Conventional Ceramic Processmentioning

confidence: 99%

Section: (A) Conventional Ceramic Processmentioning

confidence: 99%