Change from electronlike to holelike carriers in MgCNi3 via doping with B or Zn

► Hall coefficient RH has been studied in normal state B-doped and Zn-doped MgCNi3. ► It is found that RH changes from negative to positive with B content increasing. ► RH is negative for MgCNi3 and positive for ZnCNi3. ► |RH| for MgCNi3 and ZnCNi3 shows an opposite trend with temperature above ∼150 K. ► The results confirm the coexistence of electronlike and holelike carriers.