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Title: Electrical conductivity and thermoelectric power of Ge<sub>40</sub>Te<sub>60</sub> and Ge<sub>38</sub>Sn<sub>2</sub>Te<sub>60</sub> alloys
Authors: Ahmed, A M
Keywords: Elecrical conductivity
Thermo-electric power
Activation energy
Issue Date: Jul-2005
Publisher: CSIR
Series/Report no.: G01R 21/08
Abstract: The <i style="">dc</i> conductivity (<i style="">s</i>) and thermoelectric power (TEP) have been measured for the bulk binary alloy Ge<sub>40</sub>Te<sub>60</sub> and ternary alloy Ge<sub>38</sub>Sn<sub>2</sub>Te<sub>60</sub>. X-ray diffraction confirms that the samples are polycrystalline. The measurments were carried out in the temperature range 133 < <i style="">T</i>< 400 K. Variation of electrical conductivity with ambient temperature (<i style="">T</i>) proved the  semiconductor behaviour for all range of <i style="">T</i> for both materials. With annealing time (<i style="">t<sub>an</sub></i>), the electrical conduction activation energy (<i style="">E</i><i style=""><sub>s</sub></i>) has been found to be with range from 0.11<img src='/image/spc_char/cross.gif' border=0>10<sup>-3</sup> eV-63.3<img src='/image/spc_char/cross.gif' border=0>10<sup>-3</sup> eV for Ge<sub>40</sub>Te<sub>60</sub> and from 0.95<img src='/image/spc_char/cross.gif' border=0>10<sup>-3</sup> to 52.93<img src='/image/spc_char/cross.gif' border=0>10<sup>-3</sup> eV while the thermo-electric power activation energy (<i style="">E</i><sub>σ</sub>) has been found to be in the range 2.28<img src='/image/spc_char/cross.gif' border=0>10<sup>-3</sup>-39.3<img src='/image/spc_char/cross.gif' border=0>10<sup>-3</sup> eV and 1.58<img src='/image/spc_char/cross.gif' border=0>10<sup>-3</sup>-34.2<img src='/image/spc_char/cross.gif' border=0>10<sup>-3</sup> eV for two alloys, respectively.
Description: 535-541
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.43(07) [July 2005]

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