A detailed study of the morphological evolution of 2-dimensional LaF₃ nanocrystals under the thermal treatment in air was performed. XRD, SEM, TEM and ¹⁹F MAS NMR techniques were used to characterize the aggregation process of nanocrystals. ¹⁹F NMR relaxometry and diffusometry were applied to investigate changes in the dynamics of the fluorine ions. Heating of nano-structured LaF₃ above 800 K led to crystallite growth accompanied by a deceleration of ionic motion, as seen from the NMR relaxation and diffusion data. The effect is dependent on the annealing temperature, and its enhancement above 1000 K causes the morphology and dynamics of the 2D nanocrystals to approach that of the bulk material. ¹⁹F MAS NMR confirms that the local structure of annealed 2D LaF₃ is identical to that of the bulk material.

进行了在空气中热处理下二维LaF ₃纳米晶体形态演变的详细研究。XRD，SEM，TEM和¹⁹ F MAS NMR技术用于表征纳米晶体的聚集过程。¹⁹ F NMR弛豫法和扩散法用于研究氟离子动力学的变化。从NMR弛豫和扩散数据可以看出，将纳米结构的LaF ₃加热到800 K以上导致微晶生长，伴随离子运动的减速。该效果取决于退火温度，并且其在1000 K以上的增强会导致2D纳米晶体的形态和动力学接近本体材料的形态和动力学。¹⁹F MAS NMR证实退火的2D LaF ₃的局部结构与块状材料的局部结构相同。