【摘要】 利用简单的液相合成方法,在室温下制备了KMnF3圆盘状产物,盘的直径约为300nm.通过X射线粉末衍射(XRD)、透射电镜以及选区电子衍射对它的结构成分和物相进行了表征,发现圆盘形貌是由KMnF3小颗粒自组装而形成的.同时对样品的发光性质进行了研究,在416和438nm处观测到特别强的光发射,并对发射峰的来源进行了指认分析.与XRD数据计算得到的晶格参数相比,发现利用样品发光数据和公式Eem=-16963+164R,可以达到方便快捷地估算Mn-F之间距离和样品晶格常数的目的.更多还原

【Abstract】 Pure complex fluorides of KMnF₃ crystal of spherical plate with a diameter of about 300 nm were successfully prepared by a simple aqueous synthesis method at room temperature. The sample was characterized by X-ray diffractometer （XRD）, transmission electron microscopy, and selected area electron diffraction. An XRD result proves that the product is KMnF₃ of perovskite-structure. By TEM and SAED results, it is found that the spherical plate morphology of sample is formed by self-organization of KMnF₃ grains. The sample shows two strong emissions at 416 and 438 nm, some discussion is made about the photoluminescence spectra and the resource of the emissions, at the same time, with the formula: E_em=-16963+164R and the photoluminescence spectrum, the bond distance of Mn-F could be estimated. Based on the obtained data it is easy to know the crystal parameter of samples with the perovskite-structure by results of photoluminescence spectra.更多还原