The Silicon-hybrid Carbon Dot Derived from Rice Husk: A promising fluorescent probe for trivalent rare earth element ions in aqueous media

2021 ◽  
Author(s):  
Xu Chu ◽  
Yan Cao
Keyword(s):  
Rare Earth ◽  
Fluorescent Probe ◽  
Rare Earth Element ◽  
Rice Husk ◽  
Earth Element ◽  
Aqueous Media ◽  
Raw Material ◽  
Carbon Dot ◽  
Trivalent Rare Earth ◽  
Hybrid Carbon

Silicon-hybrid carbon dot (Si-CD) was synthesized using the rice husk as a raw material via the carbonization and further acid-cutting method. The as-prepared Si-CD can be well dispersed in water...

Synthesis and Luminescence Properties of Trivalent Rare-Earth Element-Doped Calcium Stannate Phosphors

2014 ◽  
Vol 47 (8) ◽  
pp. 630-641 ◽  
Author(s):  
Y. Karabulut ◽  
M. Ayvacıklı ◽  
A. Canimoglu ◽  
J. Garcia Guinea ◽  
Z. Kotan ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Luminescence Properties ◽  
Trivalent Rare Earth ◽  
Calcium Stannate

Laser-induced fluorescence (LiF) spectroscopy for detecting REE cross-contaminations in the Smithsonian rare-earth element phosphate standards

2020 ◽  
Author(s):  
Margret C. Fuchs ◽  
Jan Beyer ◽  
Sandra Lorenz ◽  
Suchinder K. Sharma ◽  
Axel D. Renno ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Near Infrared ◽  
High Sensitivity ◽  
Sample Surface ◽  
Laser Induced Fluorescence ◽  
Raw Material ◽  
Electromagnetic Spectrum ◽  
Lif Spectroscopy

<p>Spectroscopy based methods have proven great potential in efficient, non-invasive material characterization. Recording the material-specific optical properties delivers instant information on the composition of an investigated sample surface without chemical sample preparation and may be operated in spatially continuous mode. In minerals, laser-induced fluorescence (LiF) provides a promising method to address the challenges of robust and efficient rare-earth element (REE) detection. The method is based on the characteristic electronic transitions within the incompletely filled f-shell of REE. The corresponding emission shows distinct features (spectral fingerprints) in the visible and near-infrared (VNIR) range of the electromagnetic spectrum that allow to distinguish between individual REE and mineral matrix luminescence. Only REE with completely filled or empty f-orbitals miss characteristic luminescence (i.e. Y<sup>3+</sup>, Sc<sup>3+</sup>, La<sup>3+</sup>, Lu<sup>3+</sup>), while the emissions of Gd<sup>3+</sup> lie at lower wavelengths than the observed VNIR range.</p><p>We test the suitability of LiF in applications of REE identification by (1) building a spectral LiF library from a sample set of luminescent REE phosphates and (2) evaluating observed emissions in samples of non-luminescent REE, and (3) comparing indicated REE cross-contamination to results of neutron activation analysis (NAA). As samples, we use the Smithsonian REE phosphate standards for electron microprobe analysis. The synthetic material delivers a simple, well-defined host composition, is well investigated and NAA results are available on additional trace REE concentration resulting from the material production procedure. The trace REE concentrations are at the order of 10<sup>-4</sup> given in mass fraction. We employ laser-induced fluorescence at three commonly used laser wavelengths (325 nm, 442 nm, 532 nm) to acquire our REE sample spectra and record LiF signals in the visible to near-infrared spectral range (350 – 1080 nm).</p><p>The comparison of spectra from non-luminescent REE phosphates shows clear similarities in emission patterns that can be assigned to specific luminescent REE using the spectral LiF library. Our results demonstrate the suitability of LIF for REE detection along with the benefits of selective element excitation and highlight the high sensitivity of the LiF method. The detected emissions in the non-luminescent samples indicate a detection limit below mass fractions of 10<sup>-4</sup>, when compared to NAA results, but also show that not all REE are equally responsive. Here, the co-existence of REE with complex interactions such as charge transfer contributes to the observed emission pattern. Adding to the spectral LiF library data and expanding investigations to further mineral hosts will facilitate new applications of LIF for REE analysis in natural samples and its implementation in raw material exploration.</p>

Preparation of Ceria from Bastnaesite with NaHCO3 as Fluoride Retention Additive

2013 ◽  
Vol 477-478 ◽  
pp. 1423-1427
Author(s):  
Hui Zhong ◽  
Ke Hui Qiu ◽  
Yu Chong Qiu ◽  
Yu Tao Li ◽  
Ning Jia Fu
Keyword(s):  
Rare Earth ◽  
Hydrochloric Acid ◽  
Sodium Bicarbonate ◽  
Rare Earth Element ◽  
Earth Element ◽  
Rare Earth Oxide ◽  
Raw Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Impurity Elements

The CeO2 is prepared directly from bastnaesite as raw material that originated in Dechang, Sichuan province, China. Fully mixed with sodium bicarbonate (NaHCO3) and roasted at 550 °C, the rare earth element (REE) in bastnaesite transformed into rare earth oxide. And the CeO2 will be obtained by removing NaF through water washing and leaching the impurity elements including La, Fe, Al, Ca, etc. via hydrochloric acid (HCl). The CeO2 was characterized by X-ray diffraction (XRD) and X-ray fluorescence (XRF). The XRF results demonstrated that the content of CeO2 could reach more than 70% in products which can be used as polishing material.

Experimental study of trivalent rare-earth element incorporation in CaTiO3 perovskite: evidence for a new substitution mechanism

2019 ◽  
Vol 46 (10) ◽  
pp. 1003-1015 ◽  
Author(s):  
Jules Goethals ◽  
Ali Bedidi ◽  
Chloé Fourdrin ◽  
Martine Tarrida ◽  
Stéphanie Rossano
Keyword(s):  
Experimental Study ◽  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Substitution Mechanism ◽  
Trivalent Rare Earth

scholarly journals Influence of rare earth addition on the properties of AA6351 hybrid composites

2021 ◽  
Vol 9 (4B) ◽  
Author(s):  
Gaurav Arora ◽  
◽  
Satpal Sharma ◽  
Keyword(s):  
Silicon Carbide ◽  
Rare Earth ◽  
Rare Earth Element ◽  
Rice Husk ◽  
Earth Element ◽  
Rice Husk Ash ◽  
Hybrid Composites ◽  
Praseodymium Oxide ◽  
Rare Earth Addition ◽  
The Impact

Nowadays, the effect of the rare earth addition on the performance of aluminium matrix composites is a major interest for many researchers. The present research work emphasis is on the study of the effect of praseodymium oxide (rare earth element) addition on the performance of AA6351 hybrid composites. Silicon carbide and rice husk ash in the weight proportions of 6:2 were ball-milled with various weight percentages (0.4%, 0.8%, and 1.2%) of praseodymium oxide to have a consistent microstructure and combined density equivalent to the AA6351 matrix alloy. Further, AA6351 hybrid composites with the ball-milled reinforcement of silicon carbide, rice husk ash, and praseodymium oxide were produced using stir-casting technique. Physical, microstructural, mechanical, and tribological characterization were done to study the impact of praseodymium oxide addition on the developed hybrid composites. An increment of 2.61% in the density, 49.40% in the microhardness, and 19.78% in the ultimate tensile strength was recorded with the incorporation of 1.2 weight percentage of praseodymium oxide in the AA6351 hybrid composites. The wear rate of the developed composites also improved by 32.92% with the addition of praseodymium oxide. The results exhibited a remarkable improvement in the performance of the AA6351 hybrid composites with the addition of rare earth element.

RARE EARTH ELEMENT AND THORIUM ASSAYING IN PARTS OF THE EAST COAST, INDIA

2016 ◽  
Author(s):  
Shayantani Ghosal ◽  
◽  
Sudha Agrahari ◽  
Debashish Sengupta
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
East Coast
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