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Ball Milling Barium Carbonate

characterization of high-energy ball milling of ba-hexaferrite,stoichiometric mixtures of barium carbonate (baco3 – mallinckrodt) and hematite (fe2o3 – aldrich) powders to form bafe12o19 were prepared and grinded on a spex mill (model 8000). a steel container was used with 11mm. steel balls and ball to powder ratios of 10:1 and 4:1 and milling times of 1 and 5 hours. a fixed velocity of 1750 rpm was used..synthesis of nanocrystalline electron emissive materials,is normal to use emissive materials in the form of barium carbonate, calcium carbonate, and aluminum oxide mixture because carbonate mixture is more resistant to the absorption of moisture than an oxide mixture. normally, ball-milling method is used to obtain a uniform blend of emissive material [7]..synthesis and characterization of batio3 …,powders by high energy ball milling method…………….. 47 figure (4.1): dta-tg of barium carbonate (baco 3)………………. 52 figure (4.2): dta-tg of titanium dioxide (tio 2-c)………………... 53 figure (4.3): sem of dispersed powder of; (a) baco 3 (b) tio 2-c… 53 figure (4.4): dta-tg for baco 3 /tio 2.combined effect of high-energy ball milling and silica,the mixture containing aluminum oxide and barium carbonate were pulverized in a high-energy planetary ball mill. this planetary ball mill was manufactured by v.b. ceramics, chennai, india. it consists of a 250 ml stainless steel cylindrical jar, internally lined with tungsten carbide..

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