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Semi-log plot of fluorite-type lattice parameters as a function of the particle size. 1: , 2: , 3: in diameter, and 4: 99.99% powder. The solid line indicates the lattice parameter of the bulk and the dotted line a half of that of the C-type .
Log–log plot of the change in the lattice parameter vs particle size. The numerals next to the closed circles are the same as those in Fig. 1.
Lattice parameters as a function of the particle diameter: Wu et al. , Tsunekawa et al. (the present result) , and Zhang et al. .
(Color online) Typical HRTEM image of our samples including rounded and polygonal particles. Only the particles with clear images are illustrated by red lines.
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