Y2O3 and MgO co-doped ceria based electrolytes
Journal
Journal of Solid State Electrochemistry
Journal Volume
10
Journal Issue
11
Pages
879-885
Date Issued
2006
Author(s)
Abstract
Electrolytes of Ce1-x-y Y x Mg y O 2-0.5x-y were prepared with citrate method and were characterized by inductively coupled plasma-atomic emission spectrometry, energy dispersive spectrometry, powder X-ray diffraction, and impedance spectroscopy. The effect of composition on the structure, conductivity, and stability of the electrolytes were investigated. When 0 ≤ x ≤ about 0.2 and 0 ≤ y ≤ about 0.05, the electrolytes were all single phase materials of ceria-based solid solution. However, when y> about 0.05, the electrolytes became two-phase materials, Y3+ and Mg2+ co-doped ceria-based solid solution and free MgO. The sample with nominal composition of Ce0.815Y 0.065Mg0.12O2-d showed ionic conductivity at 973 K close to or even a little higher than that of similarly prepared Ce 0.9Gd0.1O1.95, but had lower cost of raw materials and a little better stability in reducing atmosphere. The existing of free MgO improved the stability of the electrolytes in reducing atmosphere, but too much free MgO reduced the conductivity.
Type
journal article