MgO或Fe2O3掺杂Ce0.8Nd0.2O1.9固体电解质的结构和电性能

doi:10.3866/PKU.WHXB201203304

Abstract

Abstract: A precursor powder of Ce_0.8Nd_0.2O_1.9 (NDC) containing 0.05% (mass fraction) SiO₂ as an impurity (NDCSi) was doped with 0-2.0% (molar fraction) MgO or FeO_1.5 via the sol-gel method. After pressing at 10 MPa, the samples were sintered at 1300 ° C for 6 h. The structure of the pellets was characterized by X-ray diffraction (XRD), Raman spectroscopy, and field emission scanning electron microscopy (FE-SEM). The electrical conductivity of the pellets was measured using AC impedance spectroscopy. All of the samples exhibited a cubic fluorite structure. Doping with MgO or Fe₂O₃ lowered the sintering temperature, and increased the density, grain boundaries and total conductivity of NDCSi. The relative density of the samples doped with Fe₂O₃ or MgO (>93%) was higher than those of NDC or NDCSi (about 86%), suggesting these dopants are effective at promoting densification. NDCSi + 0.5FeO_1.5 and NDCSi + 2.0MgO samples exhibited the highest conductivities of 0.63 × 10^-2 and 0.29 × 10^-2 S · cm^-1, respectively, which are 5.7 and 2.6 times larger than that of NDCSi (0.11×10^-2 S·cm^-1) at 550 °C. Doping with MgO or Fe₂O₃ had a larger effect on the grain boundary conductivity of SDCSi than the bulk conductivity. These results indicate that MgO and Fe₂O₃ are effective sintering aids as well as grain boundary scavengers with different mechanisms.

Key words: Solid electrolyte, Neodymium-doped ceria, Grain boundary scavenger, Electrical conductivity, Sintering aid

LIU Jian-Wei, ZHOU De-Feng, YANG Mei, LUO Fei, MENG Jian. Structure and Electrical Properties of MgO or Fe₂O₃-Doped Ce_0.8Nd_0.2O_1.9 Solid Electrolytes[J].Acta Phys. -Chim. Sin., 2012, 28(06): 1380-1386.

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Structure and Electrical Properties of MgO or Fe₂O₃-Doped Ce_0.8Nd_0.2O_1.9 Solid Electrolytes

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Structure and Electrical Properties of MgO or Fe₂O₃-Doped Ce_0.8Nd_0.2O_1.9 Solid Electrolytes