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- W1978256886 abstract "Infrared reflectivity measurements have been performed on a series of PbS single crystals. The temperature dependence of conductivity effective mass ms has been evaluated and used to compute the free-carrier mobilities. Results show how ms decreases as the crystal temperature decreases. Further results show how ms decreases as the carrier concentration decreases. The influence of crystal preparation on reflectivity properties has been studied. It has been determined that lead precipitates up to 1019 atoms/cm3 do not affect the minimum of the reflectivity curve but the homogeneity of the crystals does have a significant effect. Our determinations of conductivity effective mass of free carriers at each temperature have been used to compute the mobilities according to the two alternative theories of thermal vibration scattering, namely by acoustical and optical modes. Results show that the acoustical theory may not be used to predict temperature dependence of the mobilities, but that the optical polaron theory does give good predictions." @default.
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- W1978256886 date "1971-01-01" @default.
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- W1978256886 title "Electron Effective Mass in PbS Single Crystals by Infrared Reflectivity Measurements" @default.
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- W1978256886 doi "https://doi.org/10.1063/1.1659619" @default.
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