Electrical and Thermal Conduction Behaviors in La‐Substituted GdBaCuFeO5+δ Ceramics |
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| Authors: | Chengcheng Zeng Bin Zhan Sajid Butt Yaochun Liu Guangkun Ren Yuan‐Hua Lin Ming Li Ce‐Wen Nan |
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| Affiliation: | 1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China;2. Department of Materials Science and Engineering, Institute of Space Technology, Islamabad, Pakistan;3. School of Materials Science and Engineering, University of Science and Technology, Beijing, China |
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| Abstract: | Gd1?xLaxBaCuFeO5+δ polycrystalline ceramics have been prepared by a sol–gel method combined with the traditional ceramic processing. Analysis of the microstructure and phase composition reveals that the pure GdBaCuFeO5+δ phase can be obtained even after the substitution of 50% La at Gd‐site. The band gap can be tuned from 1.47 to 1.36 eV by La substitution, resulting in a significant increase in the electrical conductivity. In addition, the total thermal conductivity can also be suppressed by the substitution of La at Gd‐sites. A ZT value of 0.02 at 1023 K is achieved in the 50% La‐substituted samples, which is over 20 times higher than that of the pure GdBaCuFeO5+δ sample. |
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