University of PardubiceFaculty of Chemical Technology

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Study of proper preparation route of thermoelectric binary chalcogenides

Authors: Čermák Patrik | Ruleová Pavlína | Plecháček Tomáš | Beneš Ludvík | Frumarová Božena | Drašar Čestmír

Year: 2018

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Study of proper preparation route of thermoelectric binary chalcogenides	Group of materials showing significant thermoelectric effects are called thermoelectric (TE) materials. Essentially, TE effects allow mutual transformation between thermal energy and electric energy. A temperature gradient produces a gradient of electric potential along a sample and v.v. Thus, TE materials can be utilized in waste heat power generation or green cooling technologies. Efficiency of a thermoelectric device is a function of the dimensionless figure of merit ZT = α2σT/κ, where α, σ, T and κ are Seebeck coefficient, electrical conductivity, absolute temperature and thermal conductivity, respectively. Preparation of material or sample has its significance in verifiability and reproducibility of experimental results both for research and application purposes. Preparation route influences e.g. samples density, purity or homogeneity. This consequently influences transport properties. In this respect we have investigated both single- and polycrystalline samples of prospective binary chalcogenides (i.e. Bi2Se3, Bi2Te3 and SnS) prepared by different preparation routes. For structural and chemical analysis, samples were characterized by X-ray diffraction, Raman spectroscopy, X-ray fluorescence and Scanning electron microscopy with Energy-dispersive X-ray analysis. Transport properties of our materials as electrical conductivity, Hall coefficient and Seebeck coefficient of materials were also measured. Difficulties or methods associated with proper sample preparation are discussed.