Rational synthesis of metastable skutterudite compounds using multilayer precursors

Journal Article · Wed Mar 19 04:00:00 EST 1997 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja964084g· OSTI ID:484486

Hornbostel, M D; Hyer, E J; Thiel, J; Johnson, D C ^[1]

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1. Univ. of Oregon, Eugene, OR (United States)

A new metastable binary compound and a series of new, metastable ternary crystalline compounds with the skutterudite crystal structure have been prepared through controlled crystallization of amorphous reaction intermediates formed by low-temperature interdiffusion of modulated elemental reactants. Discussed in this paper are La{sub 1-x}Fe{sub 4}Sb{sub 12}, FeSb{sub 3}, Hf{sub 1-x}Fe{sub 4}Sb{sub 12}, and Y{sub 1-x}Fe{sub 4}Sb{sub 12}. The amorphous reaction intermediate for each system crystallizes exothermically near 200 {degree}C forming the desired skutterudite structure. At temperatures above 500 {degree}C, they decompose exothermically forming a thermodynamically more stable mixture of binary compounds and elemental components. We propose that the desired compounds nucleate from the amorphous precursor because slow solid state diffusion rates hinder disproportionation into the more stable mix of binary compounds and elements. This general synthetic approach to prepare new metastable compounds give control of both the composition and structure of the product compounds. 15 refs., 6 figs., 2 tabs.

• OSTI ID: 484486
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 11 Vol. 119; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIMONIDES
INTERMETALLIC COMPOUNDS
IRON COMPOUNDS
LANTHANUM COMPOUNDS
REACTION INTERMEDIATES
SYNTHESIS
THERMAL ANALYSIS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS