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lead grinding ball mill nitrogen

Nov 01, 2012 A planetary ball mill (Pulverizette-7, Fritsch, Germany) was used for grinding the mixture. Seven zirconia balls of 15 mm diameter and 2 g of mixed powder were introduced to a zirconia vessel of 45 cm 3 inner volume. The grinding was operated in a nitrogen atmosphere at 500 rpm for varying periods of time. 2.2. Characterizations

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