Effect of magnesium doping on thermoelectric and magnetic properties of copper chromite ceramic samples
| Autor: | E.A. Ovchenkov, A.V. Duvakina, D. A. Zinoviev, Vladimir G. Kytin, D. Yu. Kondratieva, I. E. Korsakov, V. A. Kulbachinskii, E.E. Kupriyanov |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Transition temperature Analytical chemistry Copper chromite 02 engineering and technology Conductivity 021001 nanoscience & nanotechnology 01 natural sciences Magnetization chemistry.chemical_compound Thermal conductivity chemistry Electrical resistivity and conductivity Seebeck coefficient 0103 physical sciences Thermoelectric effect 0210 nano-technology |
| Zdroj: | Materials Today: Proceedings. 44:3511-3515 |
| ISSN: | 2214-7853 |
| Popis: | We investigated thermoelectric and magnetic properties of polycrystalline CuCr1-xMgxO2 (x = 0; 0.002; 0.008; 0.015; 0.030) ceramic samples, synthesized by a special chemical homogenization method (nitrate synthesis). Temperature dependencies of magnetization were measured in magnetic field H = 1000 G. Transition temperature do not noticeably shift with variation of Mg content. Seebeck coefficient S increases with temperature for all investigated samples. At room temperature S decreases from nearly 700 mV/K in pristine material to about 250 mV/K for the copper chromite with 3at.% Mg. Heat conductivity k of all investigated samples is close to the heat conductivity of undoped CuCrO2 crystals. Resistivity of investigated samples decreases several orders of magnitude with increase of Mg content up to 3%. Temperature dependence of resistivity and Seebeck coefficient was interpreted by hopping conductivity in the presence of the Coulomb (parabolic) gap in the density of states. |
| Databáze: | OpenAIRE |
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