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Diffraction and Luminescence Analysis of Extremely Rapidly Cooled Molten System (lif−caf2)eut−xlnf3 (ln=sm and Gd)

Transactions of Nonferrous Metals Society of China (English Edition)(2021)SCI 2区

Slovak Acad Sci | Northeastern Univ

Cited 0|Views17
Abstract
Samples of (LiF-CaF2)(eut)-xSmF(3)(-xGdF(3)) (x=0.03-0.50) were prepared by spontaneous cooling as well by very fast cooling (using the rapid solidification processing (RSP) method) which provide two types of sample morphology: riffle-like and sphere-like fragments. All types of samples were studied by XRD, optical absorption and fluorescence spectroscopy. The presence of LiF stabilises the cubic cell dimension, and the content of lanthanide fluorides presents influence on phases formed, as well as the crystallinity of the system, in both the spontaneously and rapidly-cooled systems. The photoluminescence properties of the investigated systems are dependent on the lanthanide fluoride content. The intensity of the emission bands, corresponding to the Sm3+ ion, reaches the maximum when the Sm content is x(SmF3)=0.03. An even stronger dependence is observed of optical properties on the morphology of the samples, i.e. whether the samples are spontaneously cooled or processed by the RSP method followed by mechanical grinding. Mechanical grinding enhances the luminescent properties and leads to higher emission intensities. It is also shown that the photoluminescent spectroscopy is suitable for detection/approval of lowered local symmetry via significant splitting of spectral bands.
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molten salts,rapidly cooled molten system,SmF3,GdF3,absorption spectra,fluorescence spectra,luminescence properties
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要点】:本研究探讨了通过自发冷却和快速冷却方法制备的LiF-CaF2基熔融系统的X射线衍射、光学吸收和荧光光谱特性,揭示了稀土氟化物含量及样品形态对发光性能的影响。

方法】:使用自发冷却和快速固体化处理(RSP)方法制备样品,通过X射线衍射(XRD)、光学吸收和荧光光谱学进行分析。

实验】:研究了LiF-CaF2)(eut)-xSmF3(-xGdF3)(x=0.03-0.50)样品,实验数据集为自发冷却和RSP方法处理后的样品,结果表明SmF3含量为0.03时发射带强度最大,且机械研磨可增强发光性能。