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Research Article | Open Access

Soft-chemistry synthesis of Ba2Ca2Cu3Ox precursor and characterization of high-Tc Hg0.8Pb0.2Ba2Ca2Cu3O8+δ superconductor

T. BRYLEWSKIa( ), K. PRZYBYLSKIa, A. MORAWSKIb, D. GAJDAc, T. CETNERb, J. CHMISTd
AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Al. Mickiewicza 30, 30-059 Krakow, Poland
Institute of High Pressure Physics of the Polish Academy of Sciences, Superconductor Laboratory NL-6, ul. Prymasa Tysiąclecia 98, 00-893 Warsaw, Poland
International Laboratory of High Magnetic Fields and Low Temperatures, ul. Gajowicka 95, 53-421 Wroclaw, Poland
AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Al. Mickiewicza 30, 30-059 Krakow, Poland
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Abstract

The paper describes the sol–gel process applied to synthesize a mercury-free Ba2Ca2Cu3Ox precursor and the physicochemical properties of an Hg0.8Pb0.2Ba2Ca2Cu3O8+δ high-temperature superconductor (HTS) polycrystalline sample. The Ba2Ca2Cu3Ox precursor with desired chemical and phase compositions was obtained using EDTA gel process followed by decomposition and calcination under optimized conditions. An Hg0.8Pb0.2Ba2Ca2Cu3O8+δ superconductor with a fine-grained microstructure, composed predominantly of the (Hg,Pb)-1223 phase in the form of plate-like crystallites or oval grains and with advantageous magnetic properties (Tc(on) = 129.2 K, ΔTc = 6.5 K), was synthesized using the high-pressure crystallization method. At 20 K and 1 T, the critical current density of the studied sample was approximately 26 A/mm2, while at 4 K and 1 T it increased to 155 A/mm2. The high volume fraction of the (Hg,Pb)-1223 phase (89.1%) in the high-Tc sample was associated with the low value of the average copper valence (2.11) in the calcinated Ba2Ca2Cu3Ox precursor. Small amounts of non-superconducting secondary phases—BaCuO2, CaO, CaHgO2, CuO, Ca2CuO, BaPbO3—were also identified within the microstructure of Hg0.8Pb0.2Ba2Ca2Cu3O8+δ.

Keywords

superconductormicrostructureEDTA gel processsecondary phase

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Journal of Advanced Ceramics
Volume 5 Issue 3,
September 2016
Pages 185-196
DOI: 10.1007/s40145-016-0189-x
Cite this article:
BRYLEWSKI T, PRZYBYLSKI K, MORAWSKI A, et al. Soft-chemistry synthesis of Ba2Ca2Cu3Ox precursor and characterization of high-Tc Hg0.8Pb0.2Ba2Ca2Cu3O8+δ superconductor. Journal of Advanced Ceramics, 2016, 5(3): 185-196. https://doi.org/10.1007/s40145-016-0189-x

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Received: 18 August 2015
Revised: 22 March 2016
Accepted: 29 March 2016
Published: 29 June 2016
© The author(s) 2016

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