Power factor improvement of delafossite CuAlO2 by liquid-phase sintering with Ag2O addition |
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| Affiliation: | 1. Department of Physics, Faculty of Science, King Mongkut''s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;2. College of Advanced Manufacturing Innovation, King Mongkut''s Institute of Technology Ladkrabang, Bangkok 10520, Thailand;1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, PR China;2. Department of Electrical Engineering, Iowa State University, 4546 Union Dr, Ames, IA 50011, United States;1. Centro de Investigación y de Estudios Avanzados del I.P.N., Unidad Querétaro, A.P. 1-798, 76001 Querétaro, Qro. México;2. Depto. de Física, Centro de Investigación y de Estudios Avanzados del I.P.N., A.P. 14-740, 07360 México City, México;1. School of Electronic Information Engineering, Tianjin University, 92 Weijin road, Tianjin city 300072, China;2. Key Laboratory for Advanced Ceramics and Machining Technology,Ministry of Education, School of Materials Science and Engineering, Tianjin University, 92 Weijin road, Tianjin city 300072, China |
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| Abstract: | Thermoelectric delafossite (CuAlO2)1?x(Ag2O)x with 0<x<0.06 is prepared at three different sintering temperatures, 1323 K, 1373 K, and 1473 K. The samples are obtained from a mixture of CuO, Al2O3, and additive Ag2O powders. The mixture is ground and then pressed with uniaxial pressure into pellets. Differential scanning calorimetry and X-ray diffraction spectroscopy show that the sintering temperature to synthesize delafossite CuAlO2 with Ag2O addition is below 1473 K. X-ray diffraction patterns show the major phase of delafossite 3R-CuAlO2 along with a trace amount of 2H-CuAlO2. A small amount of the Ag phase is present in the samples depending on the amount of Ag2O addition and sintering temperature. Energy dispersive spectroscopy and backscattered electron image analyses show that the Ag phase is segregated around the grain boundary. Liquid-phase sintering is used to explain the growth mechanism. The CuAlO2 samples with Ag2O addition obviously exhibit enhanced bulk density, grain size, and electrical conductivity. The highest power factor (PF), obtained by CuAlO2 with 2 at% of Ag2O sintered at 1373 K, is 8.23×10?5 W/(m K2) at 873 K. Hence, our findings show an improvement for delafossite CuAlO2 by Ag2O addition. |
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| Keywords: | Liquid-phase sintering Power factor |
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