Synthesis of YBa2Cu3O7− via sol-gel

Sargánková, I.; Diko, P.; Τimko, M.; Černík, Miroslav; Mihalik, J.

doi:10.1016/0167-2738(93)90206-i

Cited by 4 publications

(5 citation statements)

References 14 publications

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“…Over the last decade, numerous drying techniques have been used with the sol-gel process to synthesize ultrafine YBCO powder with improved physical and chemical characteristics. Amongst them, the conventional furnace drying technique [175], aerosol process [176], spray drying [177,178], freeze drying [179,180] and hydrothermal process [132,181] are noteworthy.…”

Section: (C) Sol-gel Processmentioning

confidence: 99%

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: (C) Sol-gel Processmentioning

confidence: 99%

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

Pathak¹,

Mishra²

2005

Supercond. Sci. Technol.

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“…For reasons shown in our previous works [6,7] it is clear that neither synthesis nor sintering at different temperatures yield single-crystalline powders with narrow or grain size distributions.…”

Section: Introductionmentioning

confidence: 92%

“…Synthesizing powder at different temperatures does produce samples with different particle sizes. However, the particles obtained are not single crystals and they exhibit a bimodal crystallite size distribution [6][7][8]. Also their residual carbonate content varies strongly with synthesis temperatures [6,[9][10][11].…”

Section: Introductionmentioning

confidence: 95%

“…However, the particles obtained are not single crystals and they exhibit a bimodal crystallite size distribution [6][7][8]. Also their residual carbonate content varies strongly with synthesis temperatures [6,[9][10][11]. Sintering at different temperatures leads to the formation, at the critical invariant points, of various melt phases [12,13], some of which can wet grain boundaries [14].…”

Section: Introductionmentioning

confidence: 99%

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The preparation of uniform grain size ceramics from sedimented single-crystalline powder fractions

Sargánková

Diko

Tweed

et al. 1996

Supercond. Sci. Technol.

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A sedimentation method has been used to separate YBa 2 Cu 3 O 7−x powder with a large particle size distribution into size fractions, each of different mean particle size and narrow size distribution. These powder fractions were then pressed and sintered into ceramic specimens having uniform grain shapes and narrow grain size distributions. This method of separating powder fractions raises the question of the surface degradation of the material during sedimentation. The possibility of regenerating the degraded surface by re-annealing is then significant. In this work we have studied this behaviour by XPS and a.c. susceptibility measurements. Characteristic XPS peaks for monitoring changes due to degradation and regeneration were found in the Y 3d (∼160 eV), O 1s (∼528 eV) and C 1s (∼285 eV) regions. Our results suggest that annealing below the sintering temperature can regenerate the particle surfaces.

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“…Furthermore, Varma suggested that utilizing complex fuels be an attractive methodology to control the product composition and properties [22]. In our work, both EDTA and CA were used as complex fuels and complexing agents simultaneously due to theirs application in synthesis of ceramic powders [21,23,24] and their different chelate ability as well as their hydrogen-bond interaction. 1a and b shows the microstructure of the precursor gel with CA and with CA/EDTA complex chelating agent, respectively.…”

Section: Optimizing the Structure Of Precursor Gelmentioning

confidence: 99%