Abstract
Four efficient n-type dopants have been found for ZrNiSn-based thermoelectric materials. These are Nb or Ta at the zirconium sites, and Sb or Bi at the tin sites. No suitable dopant was found for the nickel sites. In a 
alloy, a power factor of 
and a thermal conductivity of 
were measured at 300 K, resulting in a dimensionless figure of merit ZT = 0.12. These values are increased to 
and 
at 700 K.
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