A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä

Influence of SrF2 on the Formation, Microstructure and Critical Temperature of (Bi,Pb)(2)Sr2Ca2Cu3O10 Polycrystalline Samples




TekijätJ.-C. Grivel, A. Jensen, H. Huhtinen, P. Paturi

KustantajaSPRINGER

Julkaisuvuosi2015

JournalJournal of Superconductivity and Novel Magnetism

Tietokannassa oleva lehden nimiJOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM

Lehden akronyymiJ SUPERCOND NOV MAGN

Vuosikerta28

Numero1

Aloitussivu25

Lopetussivu32

Sivujen määrä8

ISSN1557-1939

DOIhttps://doi.org/10.1007/s10948-014-2839-y


Tiivistelmä

Bulk ceramic samples with Bi1.72Pb0.34Sr1.87 Ca1.91Cu3.13O9.83-xF2x (0.00 <= x <= 0.51) nominal compositions were synthesized by a solid-state route using SrF2 as a fluorine source. Notwithstanding of the stage, at which SrF2 was introduced into the precursor powders (prior to or after calcination), a significant lowering of the reaction temperature was observed. For a fixed sintering temperature, SrF2 results in an enhanced grain growth. However, the lattice parameters of the Bi2223 phase and its superconducting transition temperature are not significantly affected by the presence of fluorine. The beneficial effect of SrF2 in terms of promoted Bi2223 phase formation appears to be limited to low SrF2 contents. It is believed that the observed effects are due to the fact that an increasing proportion of Sr is kept apart from the reaction for increasing SrF2 level, rather than to a direct involvement of fluorine.




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