Magnetic and structural characterisation of the layered materials AMnFe(C2S2O2)3

Abstract

We present structural and magnetic data on the series of compounds AMnIIFeIII(C2S2O2)3 with A=N(CnH2n+1)4 (n=3–5) or P(C6H5)4. The tetra-alkyl ammonium compounds are all ferromagnets with TC=10 K, whilst the tetraphenyl phosphonium compound is a ferrimagnet with TN=15 K. EXAFS spectroscopy shows that there is significant disorder in the orientation of the dithio-oxalate moiety, while high resolution X-ray powder diffraction measurements prove that the dithio-oxalate materials are structurally analogous to the layered oxalates.