在氨水或无水乙二胺体系中通过液相反应制备了单晶六方相LaF3薄片.用X射线衍射、透射电子显微镜、选区电子衍射、高分辨透射电子显微镜、X射线光电子能谱等对产物进行了表征.研究了反应时间对产物形貌的影响.结果表明,随着反应时间的延长,薄片尺寸变大.讨论了薄片生长的可能机理,当溶剂有配位作用时,如氨水或无水乙二胺,最初形成的LaF3沉淀溶解、重结晶,最终形成无规则的薄片;当溶剂无配位作用时,如四氯化碳或无水乙醇,最终产物为球形颗粒. Single-phase hexagonal LaF3 thin films were prepared by liquid-phase reaction in aqueous ammonia or anhydrous ethylenediamine system.The structures of the products were characterized by X-ray diffraction, transmission electron microscopy, selected area electron diffraction, high resolution transmission electron microscopy and X-ray photoelectron spectroscopy The effects of reaction time on the morphology of the product were investigated.The results show that the size of the sheet increases with the increase of the reaction time.The possible mechanism of the growth of the sheet is discussed.When the solvent is coordinated, Water ethylenediamine, the initial formation of LaF3 precipitate dissolved, recrystallized and eventually formed a random sheet; When the solvent does not coordinate role, such as carbon tetrachloride or ethanol, the final product is spherical particles.