NDLI: Thermoelectric Power Measurements of xSb-(60-x)V$_{2}$O$_{5}$-40TeO$

Content Provider	Springer Nature Link
Author	Souri, Dariush Siahkali, Zahra Moradi, Mohammad
Copyright Year	2015
Abstract	Bulk xSb-(60-x)V$_{2}$O$_{5}$-40TeO$_{2}$ glass systems (with 0 ≤ x ≤ 15 in mol.%) were prepared by using the standard melt quenching procedure, and their Seebeck coefficients, S, were measured within the temperature range of 250–470 K. For the understudied samples, the thermoelectric powers at typical temperatures of 296 K, 370 K and 407 K were measured, and were in the ranges (−405) to (−698) μVK$^{−1}$, (−394) to (−685) μVK$^{−1}$ and (−392) to (−691) μVK$^{−1}$, respectively. The selection of typical temperatures aims at the evaluation of the trend of figure of merit in these glasses. Based on the negative sign of S, the present glasses were found to be n-type semiconductors; also, the experimental relationship between S and C $_{V}$ (C $_{V}$ = [V$^{4+}$]/V $_{tot}$ is the ratio of the content of reduced vanadium ions) satisfied the theoretical Heikes formula, relating S to ln(C $_{V}$/1 − C $_{V}$), and also the Mackenzie formula, relating S to ln([V$^{5+}$]/[V$^{4+}$]). The parameter $$ \alpha^{\prime} $$ in Heikes formula was determined to be ≪1 and so the small polaron hopping conduction mechanism was certified to occur in these glasses; this result confirms the previously reported results of direct current (DC) electrical conduction experiments on the same samples. Results of thermoelectric measurements show the compositional dependence of S on Sb content and C $_{V}$, indicating that S increases with the increase in Sb content; these results show that the dominant factor determining S is C $_{V}$. Also, figure of merit was determined for these glasses, which show the highest value for 60V$_{2}$O$_{5}$-40TeO$_{2}$ glass system, as a good candidate in thermoelectric applications.
Starting Page	307
Ending Page	311
Page Count	5
File Format	PDF
ISSN	03615235
Journal	Journal of Electronic Materials
Volume Number	45
Issue Number	1
e-ISSN	1543186X
Language	English
Publisher	Springer US
Publisher Date	2015-10-19
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Amorphous materials glasses thermoelectric effects electrical conductivity Optical and Electronic Materials Characterization and Evaluation of Materials Electronics and Microelectronics, Instrumentation Solid State Physics
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Electronic, Optical and Magnetic Materials Condensed Matter Physics Electrical and Electronic Engineering

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