无机材料学报2017，Vol.32Issue(10)：1089-1094,6.DOI:10.15541/jim20160693
共压共烧法制备La0.8Sr0.2(Ga0.8Mg0.2)0.1Fe0.9O3-δ致密扩散障碍层极限电流型氧传感器
La0.8Sr0.2(Ga0.8Mg0.2)0.1Fe0.9O3-δDense Diffusion Barrier Limiting Current Oxygen Sensor Prepared by Co-pressing and Co-sintering Method
摘要
Abstract
The La0.8Sr0.2(Ga0.8Mg0.2)0.1Fe0.9O3-δ (LSGMF) mixed conductor and La0.8Sr0.2Ga0.8Mg0.2O3-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. lgIL (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., IL (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.关键词
氧传感器/共压共烧结/致密扩散障碍层/极限电流Key words
oxygen sensor/co-pressing and co-sintering/dense diffusion barrier layer/limiting current分类
化学化工引用本文复制引用
张小芳,刘涛,金宏斌,于景坤,高翔,王成,王相南..共压共烧法制备La0.8Sr0.2(Ga0.8Mg0.2)0.1Fe0.9O3-δ致密扩散障碍层极限电流型氧传感器[J].无机材料学报,2017,32(10):1089-1094,6.基金项目
国家自然科学基金(51374055 （）
52174059) National Natural Science Foundation of China (51374055 （）
52174059) （）
