Journal of Electronic Materials

, Volume 44, Issue 6, pp 1663–1667 | Cite as

YbCu2Si2–LaCu2Si2 Solid Solutions with Enhanced Thermoelectric Power Factors

  • Gloria J. Lehr
  • Donald T. Morelli
  • Hyungyu Jin
  • Joseph P. Heremans


Cryogenic Peltier coolers are ideal for cooling infrared sensors on satellites. To make these thermoelectric devices a realistic option for this application, the efficiency of thermoelectric materials at cryogenic temperatures must be substantially enhanced. Intermediate valence Yb-based compounds have large peaks in the Seebeck coefficient at low temperatures; to optimize these materials this must be understood. We created solid solutions between the intermediate valence compound YbCu2Si2 and an isostructural compound LaCu2Si2 to manipulate the temperature at which the Seebeck coefficient peaks and to maximize zT by reduction of lattice thermal conductivity. An enormous power factor of 110 μW/cm K2 at 100 K and a maximum zT of 0.14 at 125 K were achieved for one of these solid solutions.


YbCu2Si2 intermediate valence thermoelectric properties solid solutions 


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Copyright information

© The Minerals, Metals & Materials Society 2014

Authors and Affiliations

  • Gloria J. Lehr
    • 1
  • Donald T. Morelli
    • 1
    • 2
  • Hyungyu Jin
    • 3
  • Joseph P. Heremans
    • 3
    • 4
  1. 1.Department of Chemical Engineering and Materials ScienceMichigan State UniversityEast LansingUSA
  2. 2.Department of Physics and AstronomyMichigan State UniversityEast LansingUSA
  3. 3.Department of Mechanical and Aerospace EngineeringThe Ohio State UniversityColumbusUSA
  4. 4.Department of PhysicsThe Ohio State UniversityColumbusUSA

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