Structure and ferromagnetism of the rare-earth Zintl compounds: Yb{sub 14}MnSb{sub 11} and Yb{sub 14}MnBi{sub 11}
- Univ. of California, Davis, CA (United States)
Rare-earth transition metal compounds Yb{sub 14}MnSb{sub 11} and Yb{sub 14}MnBi{sub 11} have been prepared by heating stoichiometric amounts of the elements at 1000--1200 C. These compounds are isostructural with the Zintl compound Ca{sub 14}AlSb{sub 11} and crystallize in the tetragonal space group I4{sub 1}/acd (Z = 8). Single-crystal X-ray data (143 K) were refined for Yb{sub 14}MnSb{sub 11}. Structural analysis is consistent with Yb{sup 2+}. Temperature-dependent magnetic susceptibility data show that Yb{sub 14}MnSb{sub 11} orders ferromagnetically at 56 K and Yb{sub 14}MnBi{sub 11} has a ferromagnetic transition at 58 K and another transition at 28 K. High-temperature magnetic susceptibility data can be fit with a modified Curie-Weiss law and give {mu}{sub eff} = 4.92(2){mu}{sub B} and {mu}{sub eff} = 4.9(1){mu}{sub B} for the Sb and Bi compounds, respectively. This result is consistent with the assignment of Mn{sup 3+} (d{sup 4}) and Yb{sup 2+} (f{sup 14}). Single-crystal magnetic data provide additional evidence for the magnetic transitions and show that the compounds are magnetically anisotropic.
- OSTI ID:
- 316250
- Journal Information:
- Chemistry of Materials, Vol. 10, Issue 11; Other Information: PBD: Nov 1998
- Country of Publication:
- United States
- Language:
- English
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