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EffectsofBafillingfractionandNicontentonthethermoelectricpropertiesofn typeBayNixCo4-xSb1 2 (x =0— 0.1 ,y= 0— 0.4)wereinvestigated .ThermalconductivitydecreasedwithincreasingBafillingfractionandtemperature.Whenywasfixedat0 .3 ,thethermalconductivitydecreasedwithincreasingNicontent,andreachedaminimumvalueataboutx=0 . 0 5.LatticethermalconductivitydecreasedwithincreasingNicontent,monotonically (y≤ 0 .1 ) .Electronconcentrationandelectri calconductivityincreasedwithincreasingBafillingfractionandNicontent.SeebeckcoefficientdecreasedwithincreasingBafill ingfractionandNicontent.ThemaximumZTvalueof1 .2wasobtainedatabout90 0Kforn typeBa0 . 3 Ni0 . 0 5Co3 . 95Sb1 2







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