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Synthesis of nano-sized magnesium titanate powders by chemical-reactive precipitation

WANG Nian-rong~1 LIU Xiao-lin~1 YAN Tao~1 ZHOU Rong~1 CHEN Jian-feng~(1,2)(1.Key Lab for Nanomaterials,Ministry of Education;2.Research Center of the Ministry of Education for High Gravity Engineering and Technology,Beijing University of Chemical Technology,Beijing 100029,China)  
Nano-sized magnesium titanate powders was prepared by a chemical-reactive precipitation method,in which the mixture solution of MgCl_2 and TiCl_4 acted as the starting material and NaOH as precipitant,respectively.The effects of the concentration of NaOH solution,Mg~(2+) and Ti~(4+) molar ratio in the starting reactant and the calcining temperature on the particle size and phase composition of magnesium titanate were studied.The magnesium titanate powders obtained were characterized by using XRD,TG,DSC and TEM.The experimental results show that the feasible conditions for the synthesis of MgTiO_3 powders are as follows: the concentration of the precipitant is 6?mol/L,the volume ratio of the mixture solution to the NaOH solution 1∶1,the Mg~(2+)/Ti~(4+) molar ratio 1.2∶1,with the reacting temperature at 98?℃,and the ordered hexagonal MgTiO_3 powders with a mean particle size of 55?nm are obtained by calcined at 800?℃.
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