Citation: LIU Jian-Wei, ZHOU De-Feng, YANG Mei, LUO Fei, MENG Jian. Structure and Electrical Properties of M or Fe₂O₃-Doped Ce_0.8Nd_0.2O_1.9 Solid Electrolytes[J]. Acta Physico-Chimica Sinica, ;2012, 28(06): 1380-1386. doi: 10.3866/PKU.WHXB201203304 shu

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

LIU Jian-Wei ¹ ,
ZHOU De-Feng ^1, ,
YANG Mei ¹ ,
LUO Fei ¹ ,
MENG Jian ²

1.
1. School of Chemistry and Life Science, Changchun University of Technology, Changchun 130012, P. R. China;
2. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China

Received Date: 14 December 2011
Available Online: 30 March 2012
Fund Project: 国家自然科学基金(20871023) (20871023)吉林省科技发展计划项目(20101549)资助 (20101549)

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) M 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 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 + 0.5FeO_1.5 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.
- Solid electrolyte,
- Neodymium-doped ceria,
- Grain boundary scavenger,
- Electrical conductivity,
- Sintering aid
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Structure and Electrical Properties of M or Fe₂O₃-Doped Ce_0.8Nd_0.2O_1.9 Solid Electrolytes