Influence of Thermal Aging Phenomena on Thermoelectric Properties of Al-Substituted ZnO
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The thermoelectric properties and stability of Al-substituted ZnO as a potential high-temperature n-type material were studied in heating–cooling cycles. Zn1−x Al x O (x = 0.02, 0.06) was prepared by soft chemistry and solid-state reaction synthesis methods. Cycling during the thermoelectric measurement leads to an increase of the electrical resistivity and Seebeck coefficient values. The reason for this aging phenomenon can be assigned to a change in composition due to oxygen uptake along with modification in the defect concentrations. The aging is enhanced if the cycling is performed in oxygen. ZT value of 0.21 is reached at 1275 K for samples with 2% Al substitution made by soft chemistry synthesis.
KeywordsThermoelectric properties Al-substituted ZnO soft chemistry thermal cycling
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