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Crystal phase transformation and their nanostructure evolutions were studied for baseline thermoelectric ceramic Ca3Co4O9, and for a sample aged at 1283K, which is significantly higher than the Ca3Co4O9 decomposition temperature of 1199K. X-ray diffraction from both samples only reveals peaks from Ca3Co4O9 phase. TEM examination reveals that in the aged sample, CaO nano-phase exists between neighboring...
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