六边形及圆形SmF_3微米盘的水热合成与表征(英文)

Hydrothermal Synthesis and Characterization of Hexagonal and Round SmF_3 Microplates

以Sm(NO3)3.6H2O和不同的氟化物(NaBF4,NH4F)在120℃的低温水热条件下反应得到了六边形及圆形的SmF3微米盘。通过X射线衍射(XRD)、场发射扫描电子显微镜(FE-SEM)和透射电子显微镜(TEM)对产物的晶相和形貌进行了表征。XRD结果显示所得的产物是结晶良好的六方晶系。SEM和TEM测试表明得到大量均匀的厚度约为200 nm的盘状结构。研究发现氟化物种类以及反应时间对形成不同形貌的盘有重要影响。讨论了可能的形成机理。进一步研究了SmF3∶Tb3+和SmF3∶Eu3+掺杂后的产物的荧光性质。

Hexagonal and round SmF3 microplates have been prepared by low-temperature hydrothermal treatment of Sm（NO3）3·6H2O and different fluoride sources （NaBF4 or NHaF） at 120 ℃. The structure and morphology of asprepared products are characterized by X-ray power diffraction （XRD）, field emission scanning electron microscopy （FE-SEM） and transmission electron microscopy （TEM）. XRD patterns show that all the as-prepared SmF3 products have hexagonal structure and high crystallinity. FE-SEM and TEM results show that large-scale and uniform mieroplates with thickness about 200 nm can be easily synthesized. It is found that the fluoride source and reaction time have great effect on the formation of different morphological plates. The possible formation mechanism is discussed. Furthermore,the room temperature photoluminescent properties of SmF3：Tb^3＋ and SmF3：Eu^3＋ crystals have been investigated.