Scandium iridium boride Sc{sub 3}Ir{sub 5}B{sub 2} and the quaternary derivatives Sc{sub 2}MIr{sub 5}B{sub 2} with M = Be, Al, Si, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Ga, or Ge: Preparation, crystal structure, and physical properties
- Univ. Koeln (Germany). Inst. fuer Anorganische Chemie
The new compounds Sc{sub 3}Ir{sub 5}B{sub 2} and Sc{sub 2}MIr{sub 5}B{sub 2} with M = Be, Al, Si, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Ga, or Ge were prepared by arc-melting appropriate compressed mixtures of the elemental components in an argon atmosphere. They crystallize tetragonally with Z = 2 in the space group P4/mbm. According to powder diagrams, all compounds are isotypic. Structure determinations based on single-crystal X-ray data were performed for Sc{sub 2}SiIr{sub 5}B{sub 2}, Sc{sub 2}VIr{sub 5}B{sub 2}, and Sc{sub 2}FeIr{sub 5}B{sub 2}. Sc{sub 3}Ir{sub 5}B{sub 2} crystallizes with the Ti{sub 3}Co{sub 5}B{sub 2}-type compounds, while the quaternary compounds form an ordered substitutional variant of this structure. The M atoms are arranged in rows along [001] with M-M distances of {approximately}300 pm in the rows and {approximately}660 pm between the rows. For the compounds with M = Mn, Fe, or Co, this results in highly anisotropic magnetic properties. Susceptibility measurements with a Faraday balance in the range 7--770 K suggest ferromagnetic coupling in the rows at low temperatures. Between the rows, the coupling was antiferromagnetic for Sc{sub 2}FeIr{sub 5}B{sub 2} (T{sub N} {approx} 190 K) and ferromagnetic for Sc{sub 2}MnIr{sub 5}B{sub 2} (T{sub C} {approx} 115 K, {mu}{sub s} {approx} 1.2 {mu}{sub B}) and for Sc{sub 2}CoIr{sub 5}B{sub 2} (T{sub C} {approx} 135 K, {mu}{sub s} {approx} 1.2 {mu}{sub B}). The temperature dependence of the resistivity was measured for the compounds with M = Si, Mn, Fe, and Co.
- OSTI ID:
- 675635
- Journal Information:
- Chemistry of Materials, Vol. 10, Issue 10; Other Information: PBD: Oct 1998
- Country of Publication:
- United States
- Language:
- English
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