Preparation and thermoelectric properties of Al and Ti co-doped non-stoichiometric TiAl0.02O1.78 under different synthesis pressures
| Autor: | Chunxiao Wang, Yao Wang, Yuewen Zhang, Xinjian Li, Lijie Chang, Xiaopeng Jia, Baomin Liu, Guangyao Ji, Hongan Ma, Qi Chen, Junnan Wang |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Atmospheric pressure Scanning electron microscope Band gap Process Chemistry and Technology Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Electrical resistivity and conductivity Transmission electron microscopy Phase (matter) 0103 physical sciences Thermoelectric effect Materials Chemistry Ceramics and Composites 0210 nano-technology |
| Zdroj: | Ceramics International. 46:6878-6881 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2019.11.182 |
| Popis: | Nonstoichiometric TiAl0.02O1.78 materials were synthesized by high temperature and high pressure (HPHT) under different synthesis pressures (3.0 GPa, 4.0 GPa and 5.0 GPa). The purpose of combined Al and Ti doping is to improve the electrical properties of the material. And the thermal conductivity was inhibited by the HPHT process. Using the X-ray diffraction to study the phase structure. Using the transmission electron microscope (TEM) to study the microstructure and scanning electron microscope (SEM) to study morphology. Also, the thermoelectric properties were studied with respect to variable temperatures at atmospheric pressure and the effects of pressure were studied relative to the sample energy gap width. It was determined that as synthesis pressure increases, the energy gap width decreases, which aids in the resistivity decrease of the sample. When the test temperature was 973 K at atmospheric pressure and the synthesis pressure of samples was 5.0 GPa, the zT value of the sample reached a maximum of 0.20. |
| Databáze: | OpenAIRE |
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