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The general densities associated with the LiTaO3-based ceramics had been significantly enhanced by adding CoO dust. The LiTaO3-based ceramics attained the best general density (89.4%) and obtained a well-grained microstructure as soon as the added amount of CoO was 5 wt.percent. Only the LiTaO3 phase in the ceramics had been seen, showing that the ions Co diffused to the LiTaO3 lattices and mainly existed in two forms Co2+ and Co3+. The effects of this included amount of CoO f