Abstract
The aim of this work is to examine the addition of nickel in borate materials with chemical formula Ba2M1-xNix(BO3)2, M = Mg; Cd. The samples have been successfully prepared by solid state reaction at 850 °C. The borates Ba2Cd1-xNix(BO3)2 crystallize in the monoclinic cell with space group C2/m and the others system Ba2Mg1-xNix(BO3)2 exhibits the rhombohedra structure (trigonal system) with space group R-3 m. The infrared spectroscopy confirms the existence of trigonal coordination for the boron ions in the studied systems. The investigation by differential scanning calorimetry (DSC) highlights several thermal phenomena in the borates studied. The dielectric measurement as function of frequency shows the relaxation behavior in the studied materials. The phenomena observed by differential scanning calorimetry are confirmed and interpreted by means of the dielectric study at high temperatures.
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