Magnetic Properties of Manganese-Iron Multi-Metal Cyanide Compound Ni_(1.15)Mn_(0.35)[Fe(CN)6]·6H2O

摘要

A multi-metal prussian blue compound Ni_(1.15)Mn_(0.35)[Fe(CN)6]·6H2O has been synthesized. The IR spectrum of the compound shows two bands at 2096.42 and 2162.13 cm~(-1) indicating the existence of two types of cyanide groups. It undergoes a paramagnetic to ferromagnetic transition at 21 K. These results indicate that there exist a ferromagnetic exchange interaction in the complexes. According to Curie-Weiss law.paramagnetic Curie temperature (Θ) is 13.81 K and the Curie-Weiss constant (C) is 2.21 cm~3 K mol~(-1). In addition, the χ'(T) and χ" (T) show clear peak around 18-20 K. The behaviour of χ' and χ" is typical of a spin glass state go through a maximum with strong frequency dependence. The observed value of coercive field (H_c) and remanent magnetization (Mr) for the compound are 1.72 KOe and 0.682 μ_β, respectively.