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Ca3Co4O9 samples were made by the sintering method using the slurry consisted of Ca3Co4O9 powder and Ca3Co4(OH)18 hydroxide in binder solution. The preparation conditions for making the crack free samples were examined, and we found that using the slurry having a mixing ratio of Ca3Co4O9 powder to 13 or 18 wt.% Ca3Co4(OH)18 hydroxide in binder solution of 10:1.5, samples with a few crack could be...
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