Nanometer NdFeO_3 powder was prepared by decomposing a precursor Nd[Fe(CN)_6]·4H_2O, which was synthesized by coordination precipitation at room temperature. Its crystal structure, particle size and ceramic micro...Nanometer NdFeO_3 powder was prepared by decomposing a precursor Nd[Fe(CN)_6]·4H_2O, which was synthesized by coordination precipitation at room temperature. Its crystal structure, particle size and ceramic microstructure were characterized by X-ray diffraction (XRD) and transition electron microscopy (TEM). The results show that the nanometer NdFeO_3 powder is highly crystallized, with good dispersion and small diameter. The decomposing mechanism of the precursor was investigated by analyzing TG-DSC curves. Furthermore, the gas sensing properties of NdFeO_3 were tested in static state. It is shown that the gas sensor based on NdFeO_3 nanopowder shows remarkable sensitivity to C_2H_5OH.展开更多
With the Nd_2O_3, Fe(NO_3)_3·9H_2O, nitric acid(1∶1 vloume fraction) for the starting materials, rare earth composite oxide NdFeO_3 with the structure of perovskite type was synthesized by sol-gel method in the ...With the Nd_2O_3, Fe(NO_3)_3·9H_2O, nitric acid(1∶1 vloume fraction) for the starting materials, rare earth composite oxide NdFeO_3 with the structure of perovskite type was synthesized by sol-gel method in the system of citric acid. Structural characteristics were characterized by XRD and TEM which indicate that the sample is nanocrystallite with uniform grain size distribution and the average grain size is about 28 nm. Moreover, the gas sensing properties of the material were tested. The results show that NdFeO_3 sensors have high sensitivity, excellent selectivity and quick response and recovery behavior to H_2S, hence, this gas sensing material has a better prospects in industrial practice.展开更多
文摘Nanometer NdFeO_3 powder was prepared by decomposing a precursor Nd[Fe(CN)_6]·4H_2O, which was synthesized by coordination precipitation at room temperature. Its crystal structure, particle size and ceramic microstructure were characterized by X-ray diffraction (XRD) and transition electron microscopy (TEM). The results show that the nanometer NdFeO_3 powder is highly crystallized, with good dispersion and small diameter. The decomposing mechanism of the precursor was investigated by analyzing TG-DSC curves. Furthermore, the gas sensing properties of NdFeO_3 were tested in static state. It is shown that the gas sensor based on NdFeO_3 nanopowder shows remarkable sensitivity to C_2H_5OH.
文摘With the Nd_2O_3, Fe(NO_3)_3·9H_2O, nitric acid(1∶1 vloume fraction) for the starting materials, rare earth composite oxide NdFeO_3 with the structure of perovskite type was synthesized by sol-gel method in the system of citric acid. Structural characteristics were characterized by XRD and TEM which indicate that the sample is nanocrystallite with uniform grain size distribution and the average grain size is about 28 nm. Moreover, the gas sensing properties of the material were tested. The results show that NdFeO_3 sensors have high sensitivity, excellent selectivity and quick response and recovery behavior to H_2S, hence, this gas sensing material has a better prospects in industrial practice.
