Abstract
A new compound, Mn 3Pd 20P 6, has been synthesized and the crystal and magnetic structures have been determined by neutron powder diffraction. The crystal structure is cubic, with a = 11.9563 ( 2 ) Å , space group Fm 3 ¯ m, and is isostructural to Mn 3Ni 20P 6, a ternary ordering variant of the Cr 23C 6-type structure. The magnetic properties of Mn 3Pd 20P 6 and Mn 3Ni 20P 6 were studied by magnetization measurements. For Mn 3Pd 20P 6 a transition, suggested to be of first order, to a ferromagnetic structure takes place at 110 K, whereas the saturation magnetization shows unusual temperature dependence. Magnetization vs. field loops show very weak coercivity, and the magnitude of the saturation magnetization agrees well with parallel Mn magnetic moments on two different sublattices of 4.24(8) μ B, and 2.88(8) μ B, respectively, found by neutron powder diffraction at 10 K. Magnetization vs. temperature measurements for Mn 3Ni 20P 6 do not show a well-defined transition temperature, but show signatures of magnetic order with small excess magnetic moments aligned by the applied field below about 240 K. Further, signatures of a spin reorientation process at around 30 K are noted.
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