New synthesis route of PbMo{sub 6}S{sub 8} superconducting Chevrel phase from ultrafine precursor mixtures. 1: PbS, MoS{sub 2} and Mo powders

Journal Article · Sun Feb 01 04:00:00 EST 1998 · Materials Research Bulletin

DOI:https://doi.org/10.1016/S0025-5408(97)00229-8· OSTI ID:605688

Even-Boudjada, S; Burel, L; Chevrel, R; Sergent, M ^[1]

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1. Univ. de Rennes I (France). Lab. de Chimie du Solide et Inorganique Moleculaire

Fine powders of PbMo{sub 6}S{sub 8} Chevrel phase ({approximately} 0.5 {micro}m) obtained from new ultrafine precursor powders present excellent intrinsic superconducting properties, such as a critical temperature, {Tc}, of about 14 K. These results are due to ultrafine quasi-spherical PbS, MoS{sub 2}, and Mo precursor powders (0.05--0.5 {micro}m) of lead Chevrel phase synthesized by soft chemistry methods (precipitation, co-precipitation). Thus, a better reactivity between the grains of the mixture allows a decrease in the synthesis temperature of the resulting PbMo{sub 6}S{sub 8} phase (800 C instead of 950--1,000 C) required for the PbMo{sub 6}S{sub 8} synthesis from the same precursor powders made by the classical ceramic route. These new Chevrel phase powders have very fine homogeneous grains with high potential surface reactivity, giving improved grain boundaries that are able to carry high current densities.

• OSTI ID: 605688
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 2 Vol. 33; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
GRAIN BOUNDARIES
GRAIN SIZE
LEAD SULFIDES
MOLYBDENUM SULFIDES
PHASE STUDIES
SUPERCONDUCTIVITY
SYNTHESIS