the crystal structure and magnetic properties of a new ferrimagnetic semiconductor: ca21mn4sb18

2003 Magnetic properties Magnetic properties D 9000 The Crystal Structure and Magnetic Properties of a New Ferrimagnetic Semicon- ductor: Ca21Mn4Sb18. — Single crystals of the title compound are prepared from the elements by high temperature melt synthesis using Sn as a flux (800 °C, 7 d). As revealed by single crystal XRD, the new Zintl phase Ca21Mn4Sb18 crystallizes in the monoclinic space group C2/c with Z = 2. The structure contains one [Mn4Sb10] 22- unit composed of four edge sharing MnSb 4 tetrahedra, two dumbbells, four individual Sb 3- anions, and 21 Ca 2+ cations per formula unit.Magnetization measurements indicate a ferromagnetic-like transition temperature at approximately 52 K which is suppressed with increasing magnetic field. The paramagnetic regime is best fit to a ferrimagnetic model, providing a total effective moment of 4.04 µB, significantly less than expected for 4 Mn 2+ ions (11.8 µ B ). Temperature-dependent resistivity measurements show that the title compound is a semiconductor. — (HOLM, A. P.; OLMSTEAD, M. M.; KAUZLARICH*, S. M.; Inorg. Chem. 42 (2003) 6, 1973-1981; Dep. Chem., Univ. Calif., Davis, CA 95616, USA; Eng.) — W. Pewestorf 24- 016 Sb 4- 2

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Page 1: The Crystal Structure and Magnetic Properties of a New Ferrimagnetic Semiconductor: Ca21Mn4Sb18

2003 Magnetic properties

Magnetic propertiesD 9000 The Crystal Structure and Magnetic Properties of a New Ferrimagnetic Semicon-

ductor: Ca21Mn4Sb18. — Single crystals of the title compound are prepared from theelements by high temperature melt synthesis using Sn as a flux (800 °C, 7 d). Asrevealed by single crystal XRD, the new Zintl phase Ca21Mn4Sb18 crystallizes in themonoclinic space group C2/c with Z = 2. The structure contains one [Mn4Sb10]

22- unitcomposed of four edge sharing MnSb4 tetrahedra, two dumbbells, four individualSb3- anions, and 21 Ca2+ cations per formula unit. Magnetization measurements indicatea ferromagnetic-like transition temperature at approximately 52 K which is suppressedwith increasing magnetic field. The paramagnetic regime is best fit to a ferrimagneticmodel, providing a total effective moment of 4.04 µB, significantly less than expectedfor 4 Mn2+ ions (11.8 µB). Temperature-dependent resistivity measurements show thatthe title compound is a semiconductor. — (HOLM, A. P.; OLMSTEAD, M. M.;KAUZLARICH*, S. M.; Inorg. Chem. 42 (2003) 6, 1973-1981; Dep. Chem., Univ.Calif., Davis, CA 95616, USA; Eng.) — W. Pewestorf

24- 016

Sb4-2

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