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The effects of Ni and Ce co-doping on the spin entropy in Ca3Co4O9+δ have been carefully studied. It is found that Ni and Ce co-doping is more effective than single rare earth element doping in improving the spin entropy of Ca3Co4O9+δ. The largest magnetothermopower ratio value of 70 % is achieved for Ca2.8Ce0.2Co3.9Ni0.1O9+δ, which is at least two times larger than that of the reported Ca2.5Ce...
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