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

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

DOI:https://doi.org/10.1016/S0025-5408(97)00247-X· OSTI ID:616345

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

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

The authors have used a new ultrafine precursor, the Mo{sub 6}S{sub 8} binary sulfide, and ultrafine PbS and Mo powders ({approximately} 0.5--0.5 {micro}m) to prepare an original mixture for PbMo{sub 6}S{sub 8} synthesis. The reaction of PbMo{sub 6}S{sub 8} formation occurs in a two-step process, at 600 and 800 C, leading to a {approximately} 0.5 {micro}m grain size. {chi}{sub ac} measurements exhibit good superconducting quality ({Tc} {approx} 14 K) of the resulting PbMo{sub 6}S{sub 8} phase. Additionally, the authors have perfected new synthesis processes of the Ni{sub {approximately}2}Mo{sub 6}S{sub 8} and Li{sub {approximately}3}Mo{sub 6}S{sub 8} ternary Chevrel phases, precursors of the Mo{sub 6}S{sub 8} compound. These syntheses are carried out by H{sub 2}S gas sulfurization of the liquid or solid route and then reduction by H{sub 2} gas over solid. The Li{sub {approximately}3}Mo{sub 6}S{sub 8} phase was chosen because its cation deintercalation yields the smallest Mo{sub 6}S{sub 8} grain size ({approximately} 0.3 {micro}m).

• OSTI ID: 616345
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 3 Vol. 33; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

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