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

doi:10.3724/SP.J.1077.2013.12281

Abstract

Abstract:

La_0.9Sr_0.1Ga_0.8Mg_0.2O_x (LSGM) electrolytes were prepared from La_0.9Sr_0.1Ga_0.8Mg_0.2O_xpowders 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 limiting-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, respectively, showing well reproducible response characteristics.

Key words: LSGM, conductivity, electrolyte, oxygen sensor

CLC Number:

TP212

GU Yuan-Yuan, CHEN Kang, JIANG Hao, JIAN Jia-Wen. Research on the Sensitive Electric Properties of La_0.9Sr_0.1Ga_0.8Mg_0.2O_x Electrolyte[J]. Journal of Inorganic Materials, 2013, 28(4): 409-414.

Figures/Tables 11

Fig. 1 The limiting-current-type O2 sensor based on LSGM

Fig. 2 Linear shrinkage and relative density curve of LSGM as function of sintering temperature

Fig. 3 Sintering curve of LSGM

Fig. 4 XRD patterns of LSGM sintered at different temperatures for 4 h

Fig. 5 SEM images of LSGM sintered at different temperatures for 4 h

Fig. 6 The equivalent circuit

Fig. 7 The conductivity of LSGM sintered at different temperatures for 4 h

Fig. 8 Arrhenius plots of LSGM sintered at different temperatures for 4 h

Table 1 Fitting parameters

Sintering temperature/℃	A	B	R	E_a/ (kJ·mol^-1)
1300	14.84	-11.98	0.994	99.59
1350	15.24	-12.16	0.997	101.07
1400	14.96	-10.63	0.990	88.36
1450	16.71	-12.68	0.980	105.43
1500	15.99	-11.94	0.990	99.25

Fig. 9 Sensing properties of the O2 sensor based on LSGM in different gas mixtures contained 1%~50% O2 concentration at 650℃

Fig. 10 The response/recovery time curves of O2 sensor

References 10

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