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Monodisperse LaF3 nanoparticles with size of about 5 nm were obtained by a simple hydrothermal method with some simple surfactants.The as-synthesized products were characterized by X-ray diffraction (XRD),transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM).TEM and HRTEM observations of the products revealed that the as-prepared LaF3 nanoparticles are single crystals.