Synthesis and magnetic properties of La_xNd_18-xLi₈Fe₅O₃₉

Abstract

We synthesized La_xNd_18-xLi₈Fe₅O₃₉(x=0, 9, 12, 18) by a solid-state method, performed structural analysis by the Rietveld method, and measured direct and alternating current magnetometry. From the result, the temperature dependence of the dc magnetic susceptibility indicated the decrease of spin-glass transition temperature with the increase of the amount of lanthanum. Furthermore, weak ferromagnetic-like transition was observed in La₁₂Nd₆Li₈Fe₅O₃₉ at 7.8 K. This behavior corresponded with that of La₁₈Li₈Fe₅O₃₉.