Structure and properties of Sr{sub 2}Au{sub 3}In{sub 4} and Eu{sub 2}Au{sub 3}In{sub 4}
- Univ. Muenster (Germany)
Sr{sub 2}Au{sub 3}In{sub 4} was synthesized by reacting the elements in glassy carbon crucibles under an argon atmosphere in a high-frequency furnace. Eu{sub 2}Au{sub 3}In{sub 4} was obtained in the same way but starting with EuAuIn as a precursor and admixing indium and gold. Both compounds were investigated by X-ray diffraction on powders and single crystals: anti-Hf{sub 2}Co{sub 4}P{sub 3} type, P{bar 6}2m, a = 1501.6(9) pm, c = 457.9(2) pm, wR2 = 0.0734, 1030 F{sup 2} values, 45 variables for Sr{sub 2}Au{sub 2.85}In{sub 4.15} and a = 1489.7(3) pm, c = 454.90(7) pm, wR2 = 0.1222, 1051 F{sup 2} values, 45 variables for Eu{sub 2}Au{sub 3}In{sub 4}. One gold site in the strontium compound shows a mixed occupancy with indium atoms indicating a small homogeneity range according to Sr{sub 2}Au{sub 3{minus}x}In{sub 4+x}. Striking structural motifs of Sr{sub 2}Au{sub 3}In{sub 4} and Eu{sub 2}Au{sub 3}In{sub 4} are gold-centered trigonal prisms formed by the strontium (europium) and indium atoms. All gold atoms have coordination number 9 in the form of tricapped trigonal prisms. Magnetic susceptibility measurements of Eu{sub 2}Au{sub 3}In{sub 4} show paramagnetic behavior about 50 K with an experimental magnetic moment of 7.88(5) {mu}{sub B}/Eu indicating Eu{sup 2+}. Antiferromagnetic ordering is detected at 9.5(5) K at low external fields. A metamagnetic transition is observed at 2 K at a critical field of 0.5(2) T. The experimental saturation moment at 2 K and 5.5 T is 5.95(5) {mu}{sub B}/Eu. Electrical conductivity investigations exhibit metallic behavior with a room temperature value of 75 {+-} 10 {micro}{Omega}cm for the specific resistivity. 39 refs., 6 figs., 3 tabs.
- OSTI ID:
- 679235
- Journal Information:
- Journal of Solid State Chemistry, Vol. 145, Issue 1; Other Information: PBD: Jun 1999
- Country of Publication:
- United States
- Language:
- English
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