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首页> 外文期刊>Journal of thermal analysis and calorimetry >Thermal and X-ray diffraction studies of the solid-solid interactions in CuO-MoO3/MgO system
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Thermal and X-ray diffraction studies of the solid-solid interactions in CuO-MoO3/MgO system

机译：Thermal and X-ray diffraction studies of the solid-solid interactions in CuO-MoO3/MgO system

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The solid-solid interactions in pure and MoO3-doped CuO/MgO system were investigated using TG, DTA and XRD. The composition of pure mixed solids were 0.1 CuO/MgO, 0.2CuO/MgO and 0.3CuO/MgO and the concentrations of MoO3 were 2.5 and 5 mol. These solids were prepared by wet impregnation of finely powdered basic magnesium carbonate with solutions containing calculated amounts of copper nitrate and ammonium molybdate followed by heating at 400-1000 degrees C. The results revealed that ammonium molybdate doping of the system investigated enhanced the thermal decomposition of copper nitrate and magnesium hydroxide which decomposed at temperatures lower than those observed in case of the undoped mixed solids by 70 and 100 degrees C, respectively. A portion of CuO present dissolved in the lattice of MgO forming CuO-MgO solid solution with subsequent limited increase in its lattice parameter. The other portion interacted readily with a portion of MoO3 at temperatures starting from 400 degrees C yielding CuMoO4 which remained stable up to 1000 degrees C. The other portion of MoO3 interacted with MgO producing MgMoO4 at temperatures starting from 400 degrees C and remained also stable at 1000 degrees C. The diffraction peaks of Cu2M9O3 phase were detected in the diffractograms of pure and MoO3-doped 0.3CuO/MgO precalcined at 1000 degrees C. The formation of this phase was accompanied by an endothermic peak at 930 degrees C.

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