Effects of Ball Milling on the Kinetics and Mechanism of Solid State Reaction between BaCO3 and Sio2
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Effects of ball-milling en the reaction of equimolar mixtures of BaCOs and SiO2 have been studied in the temperature range between 800 and 900C by means of isothermal thermogravimetry, electron microscopy, X-ray diffraction analysis and DTA.<BR>The main part of the reaction, which corresponds to the formation of Ba2SiOi, was best expressed by Jander's equation and the activation energywas.determined as 53 kcal/mol irrespective of the ball-milling tirne. The reaction was found to proceed in three stages:<BR>BaCOs+SiO2= BaSiOs+CO, (1)<BR>BaCO3 +BaSiO3 = Ba2SiO4 + CO2 (2)<BR>Ba2SiO+SiO2=2BaSiO3 (3)<BR>The reaction (1) was independent of CO2 partial pressure, whereas the reaction (2) was checked by CO2.The increase in the reactivity as caused by ball-milling was detected by an endothermic peak at about 7500C in DTA. This peak was found to be associated with theformation of BaSiO3 (reaction(1)).The effect of ball-milling is possibly interpreted in terms of the decrease in particle size of BaCOs in early stage of ball-milling, and of the improvement of SiO2 dispersion in later stage, respectively.
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公益社団法人 日本化学会 | 論文
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