摘要
In order to investigate the phonon scattering mechanisms in double-filled skutterudites, the low-temperature lattice thermal conductivities of Ino.lYbyCO4Sb12 were measured and analyzed based on the Debye model. The eingenmode frequencies of In and Yb were obtained from low-temperature specific heat capacity analysis. It is found that filling these two types of guest atoms with different eingenmode frequencies into the voids in skutterudites could introduce strong point defect and resonant scattering to lattice phonons, thus lead to significant decrease in the lattice thermal conductivity.
In order to investigate the phonon scattering mechanisms in double-filled skutterudites, the low-temperature lattice thermal conductivities of Ino.lYbyCO4Sb12 were measured and analyzed based on the Debye model. The eingenmode frequencies of In and Yb were obtained from low-temperature specific heat capacity analysis. It is found that filling these two types of guest atoms with different eingenmode frequencies into the voids in skutterudites could introduce strong point defect and resonant scattering to lattice phonons, thus lead to significant decrease in the lattice thermal conductivity.
基金
Funded by the National Natural Science Foundation of China(No.50972047,51072062)
the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry,and the Fundamental Research Funds for the Central Universities(2011TS124,HUST)
the financial support from DOE/EPSCoR Implementation(Grant No.DE-FG02-04ER-46139) and SC EPSCoR Office/Clemson University cost sharing
