Growth rate effects on the thermoelectric performance of CaMnO3-based ceramics |
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| Affiliation: | 1. I3N, Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal;2. CICECO – Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal;3. ICMA, CSIC-Universidad de Zaragoza, Zaragoza, Spain;1. Department of Physics, National Changhua University of Education, Changhua, 500, Taiwan, ROC;2. Department of Nuclear Physics, Guindy Campus, University of Madras, Chennai, 25, India;1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;1. Instituto de Ciencia de Materiales de Aragón, CSIC—Universidad de Zaragoza, Mª de Luna, 3, 50018-Zaragoza, Spain;2. Centro Universitario de la Defensa de Zaragoza. Academia General Militar. Ctra. de Huesca s/n. 50090, Zaragoza, Spain;1. College of Physics and Electronic Engineering, Guangxi Normal University for Nationalities, 532200 Chongzuo, People''s Republic of China;2. CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 100190 Beijing, People''s Republic of China;1. School of Physics, Shandong University, Jinan, 250100, China;2. State Key Laboratory of Crystal Material, Shandong University, Jinan, 250100, China |
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| Abstract: | CaMnO3–based materials represent a promising family of n-type oxide thermoelectrics. The objective of the present work is assessing the impacts on relevant structural, microstructural and thermoelectric properties of manganites when they are processed by the laser floating zone technique. For this purpose, donor-doped Ca0.9La0.1MnO3, CaMn0.95Nb0.05O3 and undoped CaMnO3 were used. Different growth conditions have been evaluated through combined studies of structural, microstructural, and thermoelectric characteristics. Despite the presence of secondary phases, electrical resistivity is among the best reported in the literature (9 mΩ.cm at 800 °C for La-doped materials grown at 200 mm/h). Essentially high absolute Seebeck coefficient of 320 μV/K at 800 °C was observed for undoped samples grown at 10 mm/h. Power factor is significantly affected by the growth conditions, reaching the highest values when using the lowest pulling rates. Exceptionally high PF (0.39 mW/K2m at 800 °C) was obtained for undoped CaMnO3 samples grown at 10 mm/h. |
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| Keywords: | Oxide thermoelectrics Calcium manganite Laser processing Thermoelectric performance Electrical properties |
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