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(a) Ce and Y maps of Y-doped ceria and SAED patterns of ceria doped with (b) Sm, (c) Dy, (d) Y, and (e) Yb.
Oxygen -edge of pure ceria and RE-doped ceria samples. Inset shows the energy windows with a width of for calculating the integral intensities of peaks B and C.
Schematic of constructing a unit cell of a -type structure out of eight unit cells of fluorite structure by removing 25% oxygen ions and then introducing ionic shifts . Corresponding  electron diffraction patterns are shown. To clearly present the arrangement of oxygen ions in a -type structure, the shifted cations in (c) are hidden.
Values of as a function of the difference in lattice parameters of -type and fluorite-structured ceria .
Comparison between the value of and the ionic conductivity (in air) of 15 and RE-doped ceria ( and ).
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