Year: 2021
Type: article
Abstract: As being a good photoelectric and gas sensitive material, In 2 O 3 is of great interest to the thermoelectric community due to its excellent thermoelectric properties at high temperature.In this study, the second phase InNbO 4 was successfully induced into the In 2 O 3 matrix in situ by solid-state reaction combined with spark plasma sintering (SPS) to optimize the preparation process of bulk samples.It is found that introducing InNbO 4 distinctly affects the electrical transport properties of the In 2 O 3 /InNbO 4 composite samples, and its carrier concentration is dramatically increased.The highest electrical conductivity is 1548 S•cm -1 at 1023 K, which is higher than those of most element-doped samples.The power factor of 0.67 mW•m -1 •K -2 and the highest ZT value of 0.187 are achieved for the 0.998In 2 O 3 /0.002InNbO 4 sample at 1023 K.In conclusion, the electrical properties of In 2 O 3 ceramics can be effectively improved by introducing in-situ InNbO 4 second phase, and thus the thermoelectric property at high temperatures is further regulated.
Source: Journal of Inorganic Materials
DOI: 10.15541/jim20210631
Institution: Dalian University of Technology
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4206627110