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Nanocrystalline powder of LaF_3 was synthesized by a method of direct precipitation from water solution. Particle size and shape of LaF_3 nanocrystalline powder was analysed with TEM. Particles were mainly spherical with narrow particle size distribution (10～20 nm). The average particle size analysed with XRD is 16.7 nm. Nano-LaF_3 bulk material was prepared by compacting the powder to 1 GPa at room temperature and a vacuum of 10 -4 Pa. The ionic conductivity of nano-LaF_3 bulk material was studied with complex impedance spectra at room temperature. The ionic conductivity of nano-LaF_3 bulk material (1×10 -5 S·cm -1 ) at room temperature is significantly increased compared to that of single crystal LaF_3 (1×10 -6 S·cm -1 ). A special phenomenon was observed firstly time that the ionic conductivity increased gradually with multiple testing in result of relaxation.
Nanocrystalline powder of LaF_3 was synthesized by a method of direct precipitation from water solution. Particle size and shape of LaF_3 nanocrystalline powder was analyzed with TEM. Particles were mainly spherical with narrow particle size distribution (10 ~ 20 nm). with XRD is 16.7 nm. Nano-LaF_3 bulk material was prepared by compacting the powder to 1 GPa at room temperature and a vacuum of 10 -4 Pa. The ionic conductivity of nano-LaF_3 bulk material was studied with complex impedance spectra at room temperature . The ionic conductivity of nano-LaF_3 bulk material (1 × 10 -5 S · cm -1) at room temperature is greatly increased compared to that of single crystal LaF_3 (1 × 10 -6 S · cm -1). A special phenomenon was observed first time that the ionic conductivity increased gradually with multiple testing in result of relaxation.