The YCrO3 negative temperature coefficient (NTC) ceramics have been successfully fabricated through a field-assisted sintering technique with a low sintering temperature and a short sintering period. The orthorhombic perovskite YCrO3 powder synthesized from a Pechini method was formed at a temperature range of 780-800 C through a decomposition of YCrO4. The as-sintered YCrO3 ceramics had a relative density of 97.6 %. The values of ρ 25, ρ 600, B 25/600 and activation energy of the YCrO3 NTC thermistor were 1.21 × 106 Ω cm, 7.26 × 102 Ω cm, 3,358 K, 0.293 eV, respectively. Such ceramics could be used as the potential candidates for NTC thermistors in a wide temperature range from 25 to 600 C.
Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Key Lab Funct Mat & Devices Special Environm, Xinjiang Key Lab Elect Informat Mat & Devices, Urumqi 830011, Peoples R China;Univ Chinese Acad Sci, Beijing 100049, Peoples R China;Alfred Univ, New York State Coll Ceram, Kazuo Inamori Sch Engn, Alfred, NY 14802 USA
Zhang, Bo,Zhao, Qing,Chang, Aimin,et al. Synthesis of YCrO3 ceramics through a field-assisted sintering technique[J]. JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS,2014,25(3):1400-1403.