Citation: LIU Jian-Wei, ZHOU De-Feng, YANG Mei, LUO Fei, MENG Jian. Structure and Electrical Properties of M or Fe2O3-Doped Ce0.8Nd0.2O1.9 Solid Electrolytes[J]. Acta Physico-Chimica Sinica, ;2012, 28(06): 1380-1386. doi: 10.3866/PKU.WHXB201203304
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A precursor powder of Ce0.8Nd0.2O1.9 (NDC) containing 0.05% (mass fraction) SiO2 as an impurity (NDCSi) was doped with 0-2.0% (molar fraction) M or FeO1.5 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 M 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 M (>93%) was higher than those of NDC or NDCSi (about 86%), suggesting these dopants are effective at promoting densification. NDCSi + 0.5FeO1.5 and NDCSi + 2.0M 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 M or Fe2O3 had a larger effect on the grain boundary conductivity of SDCSi than the bulk conductivity. These results indicate that M and Fe2O3 are effective sintering aids as well as grain boundary scavengers with different mechanisms.
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