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- W2068599586 abstract "An investigation of the electronic (אe) and lattice (אL) parts of the thermal conductivity for samples of Bi1−x Sbx (0,02 < X < 0,12) and system of Ag-Sb-Te was carried out in the temperature interval 6-300K. Separation of אL and אe has been made by suppressing אe in magnetic field. The experimental data of אL and אe have been compared, respectively, with Gallaway’s theory and with a theory which takes into account the inelastic character of scattering. It is observed that the Lorentz number L calculated by using the experimental values of אe and thermomagnetic coefficients is smaller than its Zommerfeld’s value L0 in high doping Bi0.88Sb0.12 . A satisfactory agreement between the theory and the experiment allows to conclude that besides the normal and U-processes in Bi1−xSbx the defects of mass also plays a considerable role in scattering. It is observed that אL of single phase samples Ag0.82Sb1.18Te2.18 is smaller than AgSbTe2 samples. It is shown that this is due to the presence of p-Ag2 Te in AgSbTe2. It is established that the high concentration of intrinsic defects plays a considerable role in scattering for Ag-Sb-Te as well. Introduction The solid solutions of Bi1−xSbx are the most favorable materials for the investigations of electron and phonon phenomena. Bismuth is a semimetal with high electron and hole mobility. When Bi is doped with Sb it undergoes semimetal-semiconductor transition. Within this process additional scattering centers of electron and holes may arise. Of special interest is investigations of thermomagnetic effects in the semiconductor phase. The high mobility of charge carriers allows to separate the electronic אe and lattice אL thermal conductivity. Further, investigation of אe and thermomagnetic coefficients allows to determine the Lorentz number L from the Wiedemann-Franz equation אe = L.δ.T , generably depending on the mechanism of electron scattering and the nature of 977 ALIEV, MOVSUM-ZADEH, RAGIMOV, ZULFIGAROV interelectron and electron-phonon interactions. As is known. AgSbTe2 is in a two-phase state congisting of single-phase Ag0.82Sb1.18Te2.18 and p-Ag2Te. Investigations [1,2] show that the second phase strongly influence galvanomagnetic and thermoelectric properties. It is supposed that thermal conductivity of Ag2Te is more than the basic phase at low temperatures. 102" @default.
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- W2068599586 date "1999-12-08" @default.
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- W2068599586 title "Electronic and Lattice Thermal Conductivity of Bi_{1-x} Sb_x and Ag-Sb-Te Systems" @default.
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