Synthesis and Magnetic Properties of the Intercalation Compound FePS₃(CoCp₂)_0.40

Intercalation compound FePS₃(CoCp₂)_0.40 (CoCp₂ = cobaltocene) was synthesized, and the crystal structure and magnetic properties were studied by x-ray diffraction, magnetic susceptibility measurement, and Mössbauer spectroscopy. The crystal structure was indexed to monoclinic unit cell with a = 5.996Å, b = 10.106Å c = 12.511Å, β = 105.916°, and about 5.6Å expansion at the c direction compared to pure FePS₃. The Mössbauer spectra indicate that there are three kinds of divalent irons with high spin state in the intercalation compound, which implies that charge transfer from guest to the Fe-S e^*_g anti-bonding orbits of host lattice. No cationic vacancies are formed in the intercalation compound. The ferromagnetism at low temperature originates from the spin canting of divalent irons.