High-temperature electronic transport properties of (YCa)BaCo4O7 compounds |
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| Institution: | 1. School of Science, Henan Institute of Engineering, Zhengzhou 451191, China;2. School of Science, Jiaozuo Teacher’s College, Jiaozuo 454001, China;1. College of Science, Xi''an Shiyou University, Xi''an 710065, China;2. Institute of Modern Physics, Northwest University, Xi''an 710069, China;1. Chemistry Department, Facultad de Farmacia, Universidad CEU San Pablo, E-28668 Boadilla del Monte, Madrid, Spain;2. Renewable Energy Institute, Universidad Castilla-La Mancha, E-02006 Albacete, Spain;3. Dep. Ciencia e Ing. Materiales, Escuela Politécnica Superior, Universidad Carlos III, E-28911 Leganés, Madrid, Spain;4. Institut Laue-Langevin, BP 156-38042 Grenoble Cedex 9, France;1. Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK;2. Bragg Institute, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia;3. EMAT, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium;1. School of Nuclear Engineering, Purdue University, West Lafayette, Indiana 47906, USA;2. Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611, USA;1. CNR-SPIN Salerno and Department of Physics, University of Salerno, Fisciano (Sa) I-84084, Italy;2. Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom |
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| Abstract: | Y1−xCaxBaCo4O7 (0.0≤x≤1.0) samples were prepared by the solid-state reaction method and their high-temperature electronic transport properties were investigated in nitrogen and oxygen respectively. Phase structure of Y1−xCaxBaCo4O7 transforms from hexagonal symmetry for x ≤0.6 samples to orthorhombic symmetry for x≥0.8 samples. In nitrogen, Y1−xCaxBaCo4O7 samples evolve three kinds of electronic transport behaviors with the increase of Ca content: thermal activation conduction, small polaron hopping conduction, and a possible mixed conduction. Ca doping increases the hole concentration and thus decreases Seebeck coefficients. In oxygen, the temperature dependence of electrical resistivity and Seebeck coefficients of Y1−xCaxBaCo4O7 samples displays similar change to their respective thermogravimetric curve, showing their electronic transport behavior under the control of their oxygen adsoption/desorption process. |
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| Keywords: | A Oxides D Diffusion D Electrical properties |
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