Influence of scandium on luminescence YSAG:Yb3+
D M RevenkoО.М. ChapuraЕ. А. БондаренкоL. V. MikhnevD L GazdinskyV V MizinaV. V. OvsyannikovD V MitrofanovA. A. Zakharov
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Abstract In this work, the effects of scandium introduction on the luminescence of yttrium scandium (Sc) aluminium garnet powders doped with ytterbium (YSAG: Yb 3+ ) were investigated. Based on photoluminescence (PL) and photoluminescence excitation (PLE) spectra we made conclusions about the influence of scandium concentration and location on emission properties of ytterbium ions in YSAG. On the one hand, an analysis of the data showed that the increase of Sc concentration leads to broadening spectral lines regardless of a location of scandium ions in the crystal structure. On the other hand, the photoluminescence intensity of ytterbium ions in YSAG is more sensitive to scandium in the octahedral site than to scandium in the dodecahedral site.Keywords:
Scandium
Ytterbium
Photoluminescence excitation
Abstract In this paper, the cloud point extraction and separation of scandium and yttrium (III) via use of Triton X‐114 with and without 8‐hydroquiloline (HQ) as an added chelate agent are investigated. The effects of various parameters, such as the aqueous phase pH, HQ concentration, Triton X‐114 concentration, heating temperature, and incubation time, on the cloud point extraction of scandium and yttrium (III) are studied. The results demonstrate that, there are different extraction and separation behaviors for scandium and yttrium (III) with and without HQ as an added chelate. And in contrast to solvent extraction, cloud point extraction is an excellent method to extract and separate scandium and yttrium (III).
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Excitation spectra from the monohalides of yttrium and scandium were recorded with the laser induced fluorescence method. Spectroscopic constants and radiative lifetimes were determined for several previously unobserved electronic states. Computer generated spectral simulations were used for the determination of spectroscopic constants and Franck–Condon factors associated with the fluorescence band systems.
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1. History of Yttrium and Scandium. 2. Chemical and Physical Properties of Scandium and Yttrium. 3. Analytical Chemistry of Scandium and Yttrium. 4. Occurrence of Scandium and Yttrium in Nature. 5. Occurrence of Scandium and Yttrium in Organisms. 6. Interactions of Scandium and Yttrium with Molecules of Biological Interest. Suggested Further Reading. Index.
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A survey of the known mechanical properties of lanthanum, scandium, and the rare earths was made. The fairly comprehensive mechanical data obtained on yttrium metal are presented in detail. Scandium, the rare earths, and yttrium are discussed separately in terms of their hardness, tensile properties, and related elastic constants. (J.E.D.)
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Abstract According to the inorganic chemistry text book written by Cotton and Wilkinson, scandium is not truly a rare earth element but yttrium and lanthanides are rare earth elements. The stable oxidation state of scandium is trivalent and the ionic radius of scandium (III) is significantly smaller (0.89 Å) than those for any of the rare earth elements (1.0-1.17 Å). Chemical behaviour is intermediate between aluminium and that of lanthanides. Yttrium has a trivalent oxidation state similar to scandium and lanthanide elements and the ionic radius of yttrium (III) (1.04 Å) is close to those of erbium (1.03 A) and holmium (1.04
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Complex MgScGd(Y)Mn alloys were squeeze cast in order to study the combined beneficial influence of scandium, manganese and gadolinium or yttrium on creep resistance and mechanical properties. The development of microstructure was investigated and correlated with the relevant mechanical properties.
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Abstract Liquid‐liquid extraction and selective separation of scandium(III) and yttrium(III) with Cyanex302 (bis(2,4,4‐trimethylpentyl)monothiophosphinic acid) has been carried out by controlling the aqueous phase pH. Scandium(III) and yttrium(III) were completely recovered from the organic phase using 5.0 M and 4.0 M nitric acid respectively and determined spectrophotometrically as their complexes with Arsenazo(III). The influence of extractant concentration, equilibration time, nature of diluents, stripping agents, and diverse ions on the extraction of scandium(III) and yttrium(III) was investigated. The extractability of scandium(III), yttrium(III), and other rare earth elements was exploited for sequential separation of scandium(III)‐yttrium(III)‐lanthanum(III) and other rare earth elements viz. lanthanum(III), cerium(IV), praseodymium(III), neodymium(III), gadolinium(III), dysprosium(III), and ytterbium(III) in binary mixtures. The method presented is simple and rapid for isolation of scandium(III) and yttrium(III) from associated elements and has been successfully applied for their selective separation from complex matrices of USGS standard soil GXR‐2 and Japanese standard stream sediment sample Jsd‐3.
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