Spin-Glass Behaviour and Magnetic Properties of Multi-Metallic Prussian Blue Compound Co_(0.25)Mn_(1.25)[Fe(CN)6]·5.9H2O

摘要

Multi-metal prussian blue compound Co_(0.25)Mn_(1.25)[Fe(CN)6]·5.9H2O has been synthesized.The temperature-dependent magnetic susceptibilities indicate that there exist a ferrimagnetie interaction in the compound and magnetic transition at 9.5 K. The Curie constant of C = 6.59 cm~3 K mol~(-1) and Curie temperature of 8 = -11.28 K were observed in fitting according to Curie-Weiss law. The observed value of coercive field and remanent magnetization at 4 K for the compound are 230 Oe and 0.072 up. The presence of spin-glass behaviours in the compound is ascribed mainly to domain mobility or domain growth under different cooling conditions.The behaviour of χ' and χ" is typical of a spin glass statego through a maximum with strong frequency dependence. The observed values for the isomer shift, the quadrupole splitting is 0.41(9) minis, I.S. is -0.15(4) mm/s, values which are characteristic of low-spin Fe(III) (S = 1/2) ions. The Mossbauer spectroscopy study revealed the presence of low spin Fe(III) (S = 1/2).