Lattice Thermal Conductivity of Disordered Alloys of Ternary Compound Semiconductors Cu2(Sn, Ge)(Se, S)3(Ag, Pb, Sb)Te2, and (Ag, Sn, Sb)Te2

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Abstract
Lattice thermal conductivities of Cu2SnSe3-Cu2SnS3, Cu2SnSe3-Cu2GeSe3, Cu2Sn0.8Ge0.2Se3-Cu2Sn0.8Ge0.2Se3and Cu2Sn0.6Ge0.4Se3-Cu2Sn0.6Ge0.4Se3alloy systems have been determined as functions of the alloy compositions. Experimental results are compared with the Klemens-Drabble theory. Agreement between the theory and the experiment is good for Cu2SnSe3-Cu2SnS3system, while the experimental values are appreciably below the theoretical curve for Cu2SnSe3-Cu2GeSe3system. The discrepancy may be due to a contribution of strain to phonon scattering. In the case that both anionic sublattice and catonic sublattice are disordered as in alloy systems of Cu2Sn0.8Ge0.2Se3-Cu2Sn0.8· Ge0.2S3or Cu2Sn0.6Ge0.4Se3-Cu2Sn0.6Ge0.4S3, it was found that the resultant scattering parameter is given by the sum of the individual effects. Lattice thermal conductivities of AgSbTe2-PbTe and -SnTe systems have been re-investigated and compared with the theory. Qualitative agreement between the experimental data and the theoretical curves is obtained except for the PbTe-rich alloys in AgSbTe2-PbTe system.