Surface Modification Of Cuprous Chloride And Influences Of Its Magnetic Properties

Cuprous chloride whose surface is modified respectively by phenol,hydroquinone , phenylamine, 1,4-diaminobenzene,pyrazine and soluble polyaniline of different polymerization stage have been fabricated by using hydro-thermal, ultrasonic, pulsed laser technique. Influences of its magnetic properties have been studied by characterization of variable temperature magnetic susceptibility analysis(VSM).The characterizations and analysis show that the colour changing stability and magnetic properties are obviously influenced by different preparation method and different modifier.Cuprous - chloride modified by 1,4-diaminobenzene and pyrazine were characterized by ultraviolet spectra, fluorescence spectra,FT-IR spectra, elementary analysis, X-ray Diffraction spectra, x-ray photoelectron spectra, thermogravimetric-differential thermal analysis and variable temperature magnetic susceptibility analysis(SQUID). The characterizations and analysis show that there is coordination modification effect of the organic modifier.There is Cu-N coordination.The corresponding molecular formula are C₃₅H₂₇N₇CuCl₄, (C₆H₈N₂)₃ · Cu₄Cl₆ and CuCl·C₄H₄N₂ respectively.The former compound is instable with Cu²⁺ existed while the latter two compounds are stable. Curie transition temperature of cuprous chloride with 1,4-diaminobenzene by hydro-thermal method is 20.5K while there is antiferromagnetic exchange effect; Phase transition occurs at 13.7K of cuprous chloride with 1,4-diaminobenzene by ultrasonic method while the Curie transition temperature of two phases are 4K,76K respectively and both of they bear antiferromagnetic exchange effect;Curie transition temperature of cuprous chloride with pyrazine by hydro-thermal method is 10.1K while it bears weak diamagnetism above 100K.