Research on the Sensitive Electric Properties of La0.9Sr0.1Ga0.8Mg0.2Ox Electrolyte

La0.9Sr0.1Ga0.8Mg0.2Ox (LSGM) electrolytes were prepared from La0.9Sr0.1Ga0.8Mg0.2Ox powders sintering at 1000-1500℃ for 4 h. Both the physical and electrical properties of the LSGM samples were tested. The results show that the linear shrinkage and relative density of the samples increase with sintering temperature rising, besides, the sample sintered at 1400℃ for 4 h shows the maximum value of 24.8% and 97%, respectively. Samples sintered at 1250℃-1500℃ for 4 h have uniform phase while that sintered at 1000℃ has a large amount of impurities. The sample sintered at 1400℃ for 4 h has the largest conductivity being 0.093 S/cm at 800℃. Based on this, a limit- ing-current-type O2 sensor based on LSGM was fabricated by screen-printing technique, and the I-V characteristics and response/recovery time were measured. It shows that the I-V curves have good current plateaus, and the limiting current exhibits a linear dependence on oxygen concentration. The response/recovery time are 10-15 s and 15-20 s,