Magnetic properties of hp13 type TFe 6Ge 6(T=Zr, Nb, Hf ) alloys

Abstract

We have made magnetization measurements, Mössbauer spectroscopy and neutron diffraction experiments on hexagonal hp13 type TFe 6Ge 6(T=Zr, Hf, Nb) alloys; the 1a and 6i sites are entirely occupied by T(=Zr, Hf, Nb) and Fe, respectively. The alloys exhibit a simple antiferromagnetism with the magnetic moment of about 1 μ B/Fe atom at 295 K. The Néel temperature T N , the paramagnetic Curie temperature θ p and the internal field H in are as follows: T N =495 K, θ p =70 K and H in =227 K for T=Zr; T N =462 K, θ p =62 K and H in=198 K for T=Hf; T N=554 K, θ p=71 K and H in=198 K for T=Nb. This is in contrast with complicated magnetic properties of the isotypic alloys such as Fe 5Mn 2Ge 6.