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首页> 外文期刊>Journal of Crystal Growth >Synthesis multifarious morphologies and sizes of YBO_3:Eu~(3+) phosphors, and clarification of the crystal structure of YBO_3
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Synthesis multifarious morphologies and sizes of YBO_3:Eu~(3+) phosphors, and clarification of the crystal structure of YBO_3

机译:YBO_3:Eu〜(3+)荧光粉的合成形貌和尺寸以及YBO_3晶体结构的澄清

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A series of multicrystal and monocrystal samples of yttrium orthoborate YBO_3:Eu with different morphologies and sizes were prepared by a simple hydrothermal (HT) method at a low temperature of 260 ℃ for 3 h, in the absence of any surfactant and template, without milling and post calcination. Samples are characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), field-emission scanning electron microscopy (FE-SEM). The morphologies and sizes of YBO_3:Eu, most of which are prepared for the first time, include polycrystalline nano-sheet; monocrystalline nano-sheet, nano-particle, submicro-sheet, submicro-rod and submicro-tube; micro-flower and micro-downy ball, which are assembled by orderly nano-sheets. At the same time, multifarious clear and high-quality selected-area electron diffraction (SAED) patterns including multicrystal diffraction rings and monocrystal diffraction spots were obtained for the first time, which provide abundant stuff to study the crystal structure of YBO_3. However, all the innermost diffraction rings or spots of SAED patterns cannot be indexed by the currently accepted hexagonal crystal structure of YBO_3, whose space group is P6_3/m and lattice parameters are a = 3.778 A, c = 8.810 A. On the other hand, the whole diffraction pattern can be successfully indexed by another hexagonal structure, whose space group is P6c2 and lattice parameters are a = 6.454 A, c=8.810 A. In addition, this structure is also supported by the XRD results. As a result, the crystal structure of YBO_3 is clarified.
机译:在没有任何表面活性剂和模板的情况下,在没有任何表面活性剂和模板的情况下,通过简单的水热法(HT)在260℃的低温下制备了一系列形态和大小不同的原硼酸钇YBO_3:Eu的多晶体和单晶样品,并进行了研磨。和煅烧后。样品通过X射线粉末衍射(XRD),透射电子显微镜(TEM),场发射扫描电子显微镜(FE-SEM)进行表征。 YBO_3:Eu的形貌和尺寸,大多数是首次制备,包括多晶纳米片。单晶纳米片,纳米颗粒,亚微片,亚微棒和亚微管;微花和微毛绒球,由有序的纳米片组装而成。同时,首次获得了包括多晶衍射环和单晶衍射斑在内的多种清晰,高质量的选区电子衍射图(SAED),为研究YBO_3的晶体结构提供了丰富的材料。但是,不能通过当前接受的YBO_3六方晶体结构(其空间群为P6_3 / m且晶格参数为a = 3.778 A,c = 8.810 A)来索引SAED图案的所有最里面的衍射环或斑点。 ,整个衍射图样可以成功地由另一个六边形结构索引,该六边形结构的空间组为P6c2,晶格参数为a = 6.454 A,c = 8.810A。此外,XRD结果也支持该结构。结果,阐明了YBO_3的晶体结构。

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