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 degrees C 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 degrees C for 4 h shows the maximum value of 24.8% and 97%, respectively. Samples sintered at 1250 degrees C-1500 degrees C for 4 h have uniform phase while that sintered at 1000 degrees C has a large amount of impurities. The sample sintered at 1400 degrees C for 4 h has the largest conductivity being 0.093 S/cm at 800 degrees C. Based on this, a limiting-current-type 02 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, respectively, showing well reproducible response characteristics.