New rare-earth transition-metal compounds Eu14InPn11 and Eu14InPn11 (Pn = Sb, Bi) have been prepared in quantitative yield from heating stoichiometric amounts of the elements, which are sealed in a welded tantalum tube that is enclosed in a fused silica ampule, at 950-1200°C. These compounds are isostructural with the Zintl compound Ca14-AlSb11 and crystallize in the tetragonal space group I41/acd (Z = 8). Single-crystal X-ray data (143 K) were refined for Eu14InSb11 (a = 17.280 (5) Å, c = 23.129 (8) Å, R1 = 4.04%, wR2 = 8.65%) and Eu14MnBi11 (a = 17.632 (4) Å, c = 23.047(6) Å, R1 = 4.53%, wR2 = 7.83%). The structures of these compounds are compared with Eu14MnSb11 and other compounds of this structure type. Magnetization measurements show that Eu14MnSb11 and Eu14MnBi11 order at approximately 100 and 35 K, respectively. The effective moment in the paramagnetic state for Eu14MnSb11 is μeff = 27.0(1) μB and for Eu14MnBi11 is μeff = 27.1(1) μB. Eu14MnSb11 saturates with μsat = 102 μB at 5 K whereas Eu14MnBi11 does not saturate at 5 K with fields up to 5 T. Eu14InSb11 and Eu14InBi11 are both paramagnetic at high temperatures with μeff = 30(1) μB and 30.1(1) μB, respectively, and have transitions around 10 K to glassy and antiferromagnetic states, respectively.
|Original language||English (US)|
|Number of pages||8|
|Journal||Chemistry of Materials|
|Publication status||Published - Oct 1997|
ASJC Scopus subject areas
- Materials Science(all)
- Materials Chemistry