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Effect of supercritical drying on thermoelectric performance of aluminum doped zinc oxide is investigated. Oxide gels were obtained by sol-gel processing of alcoholic zinc nitrate solution, with addit...ion of propylene oxide as a gelation agent. The gels then were processed and dried in supercritical ethanol conditions (“A-gel” powders) or left for slow evaporation in ambient conditions (“X-gel” powders). Powders were sintered using spark plasma sintering (SPS) method. On sintered samples, the electric conductivity, the Seebeck coefficient and the thermal conductivity were measured. Distinct difference in morphology of two types of the samples was studied with SEM. The samples prepared with supercritical method exhibited up to 45% lower thermal conductivity in low temperature region. Metallic-like behavior of the electrical conductivity as observed on A-gel samples. As a consequence of good electrical properties and lowered thermal conductivity, A-gels had better result of thermoelectric efficiency (ZT). The largest dimensionless figureof-merit ZT = 0.10 was obtained for the A-gel sample.続きを見る
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