The structure and magnetic properties of molecule-based magnet nanoparticles KxVy[Cr(CN)6]z.nH2O

Kim Phu Phung, Van Hong Le and Van Minh Nguyen

Abstract

We have synthesized K_xV_y[Cr(CN)₆]_z. nH₂O molecule-based magnet nanoparticles belonging to the Prussian blue (PB) family of compounds. The synthesized samples were characterized by infrared spectroscopy (IR), Raman spectroscopy, UV–Vis spectroscopy, differential thermal analysis (DTA) and thermogravimetric analysis (TGA). The crystal structure was refined from the x-ray powder diffraction profile by the Rietveld method. The samples are cubic, Fm3m space group with lattice parameter a=1.045 nm. The magnetic properties are determined from thermal variation of the magnetization and hysteresis loop. The most interesting result is the successful preparation of K_xV_y[Cr(CN)₆]_z. nH₂O crystal Prussian blue nanomaterial which had Curie temperature (T_c) approaching room temperature