La0.8Sr0.2(Ga0.8Mg0.2)0.1Fe0.9O3-δ Dense Diffusion Barrier Limiting Current Oxygen Sensor Prepared by Co-pressing and Co-sintering Method

doi:10.15541/jim20160693

Abstract

Abstract:

The La_0.8Sr_0.2(Ga_0.8Mg_0.2)_0.1Fe_0.9O_3-_δ(LSGMF) mixed conductor and La_0.8Sr_0.2Ga_0.8Mg_0.2O_3-_δ(LSGM) solid electrolyte were prepared by solid-state reaction and characterized by XRD, TGA, Van Der Pauw dc four-probe method, and thermal expansion measurement. A limiting current oxygen sensor with LSGMF as a dense diffusion barrier and LSGM as a solid electrolyte was prepared by a co-pressing and co-sintering method. The microstructure and composition of LSGMF/LSGM cross-section were analyzed by SEM and EDS. The results show that crystal structure of LSGMF is rhombohedral perovskite which belongs to R-3c space group. Its weight loss rate is the fastest at about 650℃. The electrical conductivity increases with the temperature increasing. The thermal expansion coefficients (TECs) of LSGM and LSGMF are 12.51×10^-6/℃ and 12.80×10^-6/℃ in the range of 300-1000℃, respectively. In the range of 650-850℃, the sensor exhibits an excellent limiting current plateau. lgI_L (limiting current) depends linearly on 1000/T, and the activation energy for oxide-ion diffusion in LSGMF is 0.4008 eV. The limiting current responses depend linearly on the oxygen concentration at 800℃ and 0.3mol% < x (O₂) < 21.0mol%, i.e., I_L (mA) = 10.285x (O₂) (mol%), R=0.9982. LSGMF and LSGM combines firmly without crack, and the mole ratio of their elements is basically in agreement with the stoichiometric of LSGMF and LSGM.

Key words: oxygen sensor, co-pressing and co-sintering, dense diffusion barrier layer, limiting current

CLC Number:

TQ174

ZHANG Xiao-Fang, LIU Tao, JIN Hong-Bin, YU Jing-Kun, GAO Xiang, WANG Cheng, WANG Xiang-Nan. La_0.8Sr_0.2(Ga_0.8Mg_0.2)_0.1Fe_0.9O_3-_δ Dense Diffusion Barrier Limiting Current Oxygen Sensor Prepared by Co-pressing and Co-sintering Method[J]. Journal of Inorganic Materials, 2017, 32(10): 1089-1094.

Figures/Tables 8

Fig. 1 XRD patterns of LSGMF and LSGM

Fig. 2 TG and DTG curves of LSGMF

Fig. 3 Arrhenius plot of total conductivity of LSGMF

Fig. 4 Thermal expansion curves of LSGM and LSGMF

Fig. 5 I-V curves of oxygen sensor at different temperatures

Fig. 6 I-V curves of oxygen sensor with different oxygen contents

Fig. 7 SEM image(a) and EDS analysis of Area A/B for LSGMF/LSGM interface

Fig. 8 SEM-EDS plane scan analysis of LSGMF/LSGM interface

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