  The facile chemical precipitation method and subsequent thermal treatment
were shown to be suitable for preparation of crystalline ThO2
nanoparticles(NPs) in a wide range of particle sizes (from 2.5 to 34.3 nm). The
obtained NPs were investigated with X-ray diffraction, high-resolution
transmission electron microscopy, and X-ray absorption techniques to find out
the possible size effects associated with nanocrystalline thoria.
