Sol-gel route for obtaining bismuth high T c superconducting oxide compounds

Marta, Liana; Ciontea, L.; Petrișor, T.; Zaharescu, M.; Crışan, D.; Haiduc, I.

doi:10.1007/bf00486286

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…However, Bi-Sr-Ca-Cu-O superconductors have been obtained by sol-gel method starting only from acetate mixture [2][3][4]. Despite the good homogeneity usually obtained through this process, the chemistry of acetate sol-gel route in quaternary Bi-Sr-Ca-Cu-O system is far from being elucidated.…”

Section: Introductionmentioning

confidence: 99%

Contributions to the gelling process in the Bi−Sr−Ca−Cu−O system, via acetate route

Marta

Sârbu

Zador

et al. 1997

J Sol-Gel Sci Technol

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Abstract. Metal acetates represent suitable precursors in the sol-gel method. Generally, acetates are used in multicomponent systems with alkoxides or other carboxylic salts. However, Bi-Sr-Ca-Cu-O superconductors have been obtained by the sol-gel method starting only from acetate mixture. This work was intended to study the gelling process of acetates involved in the formation of bismuth-based superconducting phases, both individually and in the bi-and multicomponent systems. Probably, copper acetate is mainly responsible for the gel formation in these systems. The gelling process was monitored by measuring the pH, density and viscosity changes. The gels obtained were characterized by UV-VIS and IR spectra, DTA/TGA and powder X-ray diffraction.

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Section: Introductionmentioning

confidence: 99%

Contributions to the gelling process in the Bi−Sr−Ca−Cu−O system, via acetate route

Marta

Sârbu

Zador

et al. 1997

J Sol-Gel Sci Technol

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“…For the synthesis of high quality 2223 monophasic ((Bi, Pb) 2 Sr 2 Ca 2 Cu 3 O 10 ) ceramic several methods such as sol-gel synthesis [1,2], aerosol decomposition [3], coprecipitation [4], codecomposition [5] and others have been applied with success. Despite the fact that these methods lead to good results, synthesis of 2223 phase is still a challenging problem.…”

Section: Introductionmentioning

confidence: 99%

One step synthesis of Bi(Pb)-2223 phase in Bi(Pb)-Sr(Ba)-Ca-Cu nitrate freeze dried powder

Badica¹,

Aldica²,

Mandache³

1999

Supercond. Sci. Technol.

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One step synthesis of the superconducting Bi(Pb)-2223 phase during heat treatment for non-equilibrium decomposition of the freeze dried Bi:Pb:Sr:Ba:Ca::0.4:1.8:0.2:2.2:3.0 nitrate powder has been studied. The heating rate was and samples were maintained in air at C for 0, 5, 10, 20, 30, 60, 90, 240 and 1080 min. Each batch was investigated by x-ray diffraction analysis and ac magnetic susceptibility . Evolution of phases and kinetics of phase formation-decomposition processes were discussed. % of Bi(Pb)-2223 has formed indicating the possibility of lowering the processing time of the freeze dried precursor powders by one order of magnitude comparative to the multistep synthesis route (from hundreds to tens of hours). A 30 min heat treatment step at C performed on the way up to the synthesis temperature is a forthcoming operation in order to block the formation of secondary undesired phases (e.g. .

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