Synthesis and NMR cryoporometry of LaF 3 nanoparticles with closed pores filled by D 2 O

The series of LaF 3 nanoparticles with closed pores filled with water H 2 O and heavy water D 2 O are synthesized by the hydrothermal treatment in autoclave at 140 °C, 160 °C, and 180 °C for 24 h. The samples are characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and nuclear magnetic resonance (NMR) cryoporometry techniques. According to particle size distribution, the mean diameter of synthesized particles ranges from 31 to 45 nm. The pore sizes for H 2 O and D 2 O inside nanoparticles are determined by NMR cryoporometry and TEM methods. The method for the synthesis of nanoparticles with closed pores filled with heavy water is proposed.