Thermoelectric properties of La7Mo7O30 sintered by reactive spark plasma sintering |
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| Affiliation: | 1. College of Physics, University-Industry Joint Center for Ocean Observation and Broadband Communication, Qingdao University, Qingdao, 266071, China;2. National Demonstration Center for Experiment Applied Physics Education (Qingdao University), Qingdao, 266071, China;3. Shandong Provincial University Key Laboratory of Optoelectrical Material Physics and Devices, Qingdao, 266071, China;4. Weihai Innovation Research Institute of Qingdao University, Weihai, 264200, China;1. Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;2. College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 211816, China;3. Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing, Yantai, 264006, Shandong, China;4. Avic Manufacturing Technology Institute, Beijing, 100024, China;1. School of Civil Engineering, Architecture and Urban Design, University of Campinas (UNICAMP), Rua Saturnino de Brito 224, Campinas, São Paulo, 13083-889, Brazil;2. FACENS University, Rodovia Senador José Ermírio de Moraes 1425, Castelinho km 1,5, Alto da Boa Vista, Sorocaba, São Paulo, 18087-125, Brazil;3. Polytechnic School, Centro Interdisciplinar de Energia e Ambiente (CIENAM), Bahia Federal University (UFBA), Rua Aristides Novis, 02, Campus da Federação, Salvador, Bahia, 40210-630, Brazil;4. University Center of Minas South (UNIS-MG), Avenida Alzira Barra Gazzola 650, Bairro Aeroporto, Varginha, Minas Gerais, 37031-099, Brazil;1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China;2. Hubei Longzhong Laboratory, Xiangyang, 441000, Hubei, China;1. State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, Guangdong University of Technology, Guangzhou 510006, PR China;2. Guangzhou Key Laboratory for Clinical Rapid Diagnosis and Early Warning of Infectious Diseases, KingMed School of Laboratory Medicine, Guangzhou Medical University, Guangzhou, 510182, PR China;1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China;2. School of Mechanical Engineering, Hunan University of Technology, Zhuzhou, 412007, China;3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang, 110016, China;4. Aluminum Valley Industrial Technology Institute, 888 Aluminum Valley Building, Heban 2nd Road, Zouping, 256200, China |
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| Abstract: | In this work, spark plasma sintering of La2Mo2O9 powder was used to achieve dense ceramics of La7Mo7O30 and explore their thermoelectric properties. SPS sintering of La2Mo2O9 powder at 973 K for 10 min under 90 MPa leads to a bicoloured sample with white and black faces. XRD patterns of white and black faces are attributed to La2Mo2O9 and La7Mo7O30 phases, respectively. These experimental conditions allow observing the in-situ reduction of La2Mo2O9 during the SPS process. With a longer sintering time of 30 min, a ceramic of La7Mo7O30 is obtained. Its electrical conductivity exhibits a semiconducting behaviour and reaches a value of 1000 Sm-1 at 1000 K. The negative Seebeck coefficient show a n-type conduction in this phase. La7Mo7O30 exhibits a very low thermal conductivity, less than 1 Wm?1K?1 from room temperature up to 1000 K, similar to the values reported for La2Mo2O9. A figure of merit of 0.04 is reached at 1000 K. |
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| Keywords: | Thermoelectrics Thermal conductivity Oxide Reactive spark plasma sintering |
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