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Gas-sensing property and mechanism of CaxLa1−xFeO3 ceramics |
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| Authors: | Ling-bing Kong Yu-sheng Shen |
| Affiliation: | a Electronic Materials Research Laboratory, Xi'an Jiaotong University, Xi'an 710049, China b Department of Materials Science and Engineering, The University of Science and Technology of China, Hefei 230026, China |
| Abstract: | LaFEO3 and CaxLa1?xFeO3 ceramic powders have been prepared by the coprecipitation method from La(NO3)3, Fe(NO3)3 and Ca(NO3)2 aqueous solutions. The orthorhombic perovskite phases of LaFeO3 and CaxLa1?xFeO3 are characterized by X-ray diffraction patterns. The sensors fabricated with those powders have high sensitivity to alcohol. Partial substitution of La3+ in LaFeO3 with Ca2+ can enhance the sensitivity of the materials to reducing gases. The resistance of an LaFeO3 sensor in air, vacuum and alcohol-containing air has been measured. Complex impedance spectroscopy has been used to try and analyse the gas-sensing mechanism. According to the experimental results, it can be deduced that the surface adsorptive and lattice oxygen govern the sensing properties of LaFeO3 and CaxLa1?xFeO3 ceramics. |
| Keywords: | Ceramics Gas sensors Alcohol sensors |
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