Rare earth elements

Having started the exploration of rare earth elements (REE) since the early 1958 and currently ranked the second in the world in term of REE potential, only after China, the REE exploration and production industry in Vietnam is still in an early stage of exploration and production due to a number of reasons, including lacks of investment, testing and mining experiences, up-to-date technology, good development policy and adequate guidance regulations.

7p viellison 06-05-2024 3 2   Download

Ebook "Carl Auer von Welsbach: Chemist, inventor, entrepreneur" is documents the life, discoveries and inventions of the chemist Carl Auer von Welsbach. Particular attention is given to his pioneering work on the rare earth elements, including the discovery of four new elements, which allowed him to develop new materials, to invent new useful devices and to establish major industries.

150p tracanhphuonghoa1007 22-04-2024 6 3   Download

The extrinsic properties of NdFeB-based magnets can be tuned through partial substitution of Nd by another rare-earth element and Fe by Co, as such substitution leads to a modification in the intrinsic properties of the main phase.

6p viberbers 09-08-2023 5 3   Download

Mn-Ga-based alloy system has exhibited hard magnetic properties, although this alloy system contains no rare earth elements. However, magnetic parameters of Mn-Ga alloys have not yet been comparable to those of rare earth magnets such as Nd-Fe-B, Sm-Co, etc. Therefore, enhancement of the magnetic properties of the Mn-Ga-based alloys has interestingly been researched by scientists in the world.

10p vidudley 20-02-2023 6 2   Download

The radioactivity of nuclides and content of heavy elements in soil, water and air are commonly important criteria in the environmental assessment of the mining areas. The study within the years of 2016-2018 on radioactivity and heavy elements content in the water and air samples at Lai Chau Rare Earth project (belonged to Dong Pao rare earth mine area) is to support the environmental survey and assessment program running by environment agency to manage the individually environmental mining area.

8p vicedric 08-02-2023 6 4   Download

The work focus to enhance the properties of xanthan gum (XG) by anchoring metal ions (Fe, Zr) and encapsulating inorganic matrix (M@XG-ZA). The fabricated nanocomposite was characterized by Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDX), Fourier Transform Infrared Spectroscopy (FTIR), surface area (BET) and zeta potential analysis.

11p vihermione 06-01-2023 3 2   Download

Rare-earth elements (REEs) are indispensable in various applications ranging from catalysis to batteries and they are commonly found from phosphate minerals. Xenon is an excellent exogenous NMR probe for materials because it is inert and its 129Xe chemical shift is very sensitive to its local physical or chemical environment.

8p vironald 15-12-2022 6 2   Download

In this study, we have successfully synthesized the metal organic framework MOF-5 and MOF-5 doped with the Eu rare earth element. Physical-Chemical analyses via SEM, FTIR and Elemental analysis showed the structure and the composition of synthetic materials.

4p vispyker 16-11-2022 13 4   Download

This article shows the results of radioactive measurements and analysis by regular grids before and after exploration activities. The investigated area has been divided into two different subunits characterized by different levels of the radiation dose.

8p vipagani 24-10-2022 3 3   Download

Despite titanium (Ti) and zirconium (Zr) minerals being critical, often irreplaceable, and generally unrecyclable components of modern materials, there is very little understanding on the constraints affecting their availability within the public literature. And while co/by-products such as hafnium (Hf), vanadium (V), garnet, and rare earth elements (REE) add significant value to the extraction of these minerals, they suffer from the same level of recyclability and understanding as Ti and Zr minerals.

155p runordie3 06-07-2022 7 1   Download

Garnet-bearing xenoliths are observed within a trachytic dome extrusion in the Hisarlıkaya region (Ankara). These garnets exhibiting greenish-reddish-dark brown colour and ranging in sizes up to 1 cm were examined in terms of mineralogical, geochemical, and gemmological characteristics. Mineralogical studies indicate that these garnets (And88-93 Grs7-12) are linked to solid solution series, which are dominantly andradite with lower content of grossular. According to major, trace, and rare earth element (REE) analysis

13p tanmocphong 29-01-2022 16 1   Download

Amorphous cerium phosphate was prepared and characterized. Three-level Box-Behnken design (BBD) was employed to analyze the effect of process variables such as initial pH (2–6), contact time (60–180 min), and sorbent amount (0.05–0.15 g) on the sorption capacity of europium. Analysis of variance (ANOVA) revealed that the main effect of initial pH and sorbent amount has a substantial impact on the sorption of Eu(III). Probability F-value (F = 3 × 10 −3 ) and correlation coefficient (R2 = 0.97) point out that the model is in good accordance with experimental data.

16p tudichquannguyet 29-11-2021 12 1   Download

The mixed ligand coordination compounds containing acesulfamato and N,N-diethylnicotinamide biomolecules of some rare earth metal cations (Eu3+, Tb3+, Ho3+, Er3+ and Yb3+) were synthesized, and their structural properties were investigated. Possible structural formulas have been proposed by determining the chemical composition of molecules (elemental analysis), binding properties (infrared spectroscopy, mass analysis, solid-state UV-vis spectroscopy), thermal degradation properties (TGA / DTA curves).

12p tudichquannguyet 29-11-2021 4 0   Download

This research presents the distribution of dissolved REE and methane concentrations in the East China Sea water column and a comparison with the East Vietnam Sea (Bien Dong). In general, the REE concentrations of the shelf water are markedly higher than those of Okinawa Trough water in the East China Sea.

4p viwendy2711 05-10-2021 14 1   Download

In this paper, we present for the first time geochemical data of the lamprophyre dikes cropping out at Khe Phen and Xuan Long granite quarries (western Thua Thien Hue Province).

4p viwendy2711 05-10-2021 5 1   Download

The purpose of the thesis research: Synthesis of new complexes of platinum and rare-earth elements containing quinoline's derivatives that are resistant to cancer cells, high antimicrobial activity or good fluorescence.

27p tunelove 10-06-2021 15 4   Download

The research objectives of the thesis: Mn-(Bi, Ga) based rare-earth-free hard magnetic materials. Soft magnetic materials of Fe-Co. Rare-earth-free hard magnetic nano composite materials of Mn-(Bi, Ga)/Fe-Co.

27p thebadguys 08-06-2021 27 5   Download

Lanthanum (La) is a rare earth element that can infuence plant growth and development. However, the efect of La on growth, yield formation and 2-acetyl-1-pyrroline (2-AP, a key compound responsible for the aroma of rice) biosynthesis in aromatic rice (Oryza sativa L. subsp. japonica Kato) has not been reported.

13p vijichea2711 28-05-2021 8 1   Download

This research is focused on using a rare-earth element, which is the fluorescent Tb3+ nano-ion, and the CD133 monoclonal antibody to create a CSC-targeting nanocomplex (LV3). Tb3+ nanorods were silica-surface treated and -NH2 activated before being conjugated with the monoclonal antibody (mAb) against CD133, a typical CSC surface marker...

7p nat_qb73 21-02-2021 7 1   Download

In this paper, the nano perovskite La1–xAxFeO3 sample systems (A = Y, Nd), with x = 0, 0.1, 0.3, were successfully fabricated. The doping of rare earth elements Y or Nd causes the perovskite structure to be distorted, leading to the appearance of a covalent mixed state that strongly affects the of the manufactured materials. The sample system shows the magnetic properties close to the superparamagnetic state at room temperature.

5p nguaconbaynhay9 03-12-2020 6 1   Download