Kim, Yanghee Lee, Ji Yeong Cho, Min Kyung Ahn, Jae-Pyoung Kim, Young-Wook 2024-01-19T13:32:53Z 2024-01-19T13:32:53Z 2021-10-21 2021-10-01 0272-8842 https://pubs.kist.re.kr/handle/201004/116270 Grain boundaries typically dominate the electrical properties of polycrystalline ceramics. To understand the effect of grain boundaries on the electrical conductivity of SiC ceramics sintered with 2000 ppm Y2O3, the electrical resistivity of individual grains and multi-grains across boundaries at the micron scale was measured using a nano-probing system equipped with nano-manipulators. The results revealed that grain resistivity was bimodal because of the existence of a core/rim structure in grains, and the electrical resistivity of multigrain samples slowly increased with an increase in the number of grain boundaries crossed. Specifically, the electrical resistivity of a grain without a core, a grain with a core, a bicrystal with a single boundary, a sample crossing three boundaries, and a bulk polycrystalline sample were 2.36 x 10(-1), 5.05 x 10(-1), 4.80 x 10(-1), 5.04 x 10(-1), and 5.84 x 10(-1) Omega cm, respectively. The results suggest that the electrical resistivity of polycrystalline SiC ceramics is primarily influenced by the presence of a grain boundary or core and secondarily by the number of boundaries. English ELSEVIER SCI LTD SILICON-CARBIDE CERAMICS HIGH-TEMPERATURE STRENGTH THERMAL-PROPERTIES MECHANICAL-PROPERTIES ALUMINUM NITRIDE CONDUCTIVITY YTTRIA MICROSTRUCTURE OXIDE Electrical resistivity at the micron scale in a polycrystalline SiC ceramic Article 10.1016/j.ceramint.2021.06.123 1 CERAMICS INTERNATIONAL, v.47, no.19, pp.27100 - 27106 CERAMICS INTERNATIONAL 47 19 27100 27106 scie scopus 000689702200004 2-s2.0-85109072338 Materials Science, Ceramics Materials Science Article SILICON-CARBIDE CERAMICS HIGH-TEMPERATURE STRENGTH THERMAL-PROPERTIES MECHANICAL-PROPERTIES ALUMINUM NITRIDE CONDUCTIVITY YTTRIA MICROSTRUCTURE OXIDE Silicon carbide Electrical property Grain resistivity Nano-manipulator Micron scale resistivity