Abstract
In our research it is firstly found that BaSm2Ti4O12 (BSTO) ceramics only show negative temperature coefficient (NTC) effect in wide temperature range. The effects of sintering temperature on the microstructure and electrical properties of BSTO have been investigated. The relative density of as-sintered ceramics increases at first and then decreases with increasing sintering temperature. In the temperature of 400-850℃, all samples show a linear relationship between the natural logarithm of resistivity and the reciprocal of temperature, indicating the NTC characteristics. The electrical resistivity decreases with increasing sintering temperatures. However, the activation energy Ea400/850℃ and material constant B400/850℃ decrease first and then increase, which are attributed to the variation of oxygen vacancy. The value of resistivity ρ400℃, Ea400/850℃ and B400/850℃ is in the range of 4.8×107–1.43×108Ω•cm, 1.33–1.41 eV and 15300–16400 K, respectively. This material has broad prospects in the field of high-sensitivity high-temperature thermistors research.
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