The series of DyF3nanosized samples was synthesized by the colloidal chemistry method. The microwave-assisted hydrothermal treatment was used for the first time for the modification of DyF3nanoparticles. Transmission electron microscopy images show that the DyF3nanoparticles have average particle size of about 16–18 nm and the size distribution becomes narrower during the microwave irradiation. The X-ray diffraction analysis shows the narrowing of the diffraction peaks versus microwave treatment time. The experimental data demonstrates restructuring of the nanoparticles and their crystal structure becomes closer to the ideal DyF3regular structure during the microwave irradiation of colloidal solution. The defect-annealing model of the microwave-assisted hydrothermal modification process is suggested.

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The series of DyF3 nanoparticles samples are synthesized by the hydrothermal treatment in autoclave at 140°C, 160°C, 200°C and 230°C for 24 h. The samples are characterized by X-ray powder...