Results 101 to 110 of about 742,292 (243)

A Para-Substituted 2-Phenoxy-1,10-Phenanthroline Ligand for Lanthanide Sensitization: Asymmetric Coordination and Enhanced Emission from Eu³⁺, Tb³⁺, Sm³⁺ and Dy³⁺ Complexes

Molecules
A para-substituted 1,10-phenanthroline ligand, 2-(4-methylphenoxy)-1,10-phenanthroline (L24), was synthesized and structurally characterized. Complexes with Eu3+, Tb3+, Sm3+, and Dy3+ were obtained in a 2:1 ligand-to-metal ratio and analyzed using single-
Joana Zaharieva, Vladimira Videva, Mihail Kolarski, Rumen Lyapchev, Bernd Morgenstern, Martin Tsvetkov   +5 more
doaj   +1 more source

On the Extraction of Rare Earth Elements from Geothermal Brines

Resources, 2017
The availability of rare earth elements from primary resources has come into question in the last two decades. This has sparked various government and industry initiatives to examine potential rare earth element resources apart from virgin ore bodies ...
York R. Smith, Pankaj Kumar, John D. McLennan   +2 more
doaj   +1 more source

From resource advantage to economic superiority : development and implications of China's rare earth policy [PDF]

, 2011
Rare Earth Elements (REE) have become the new strategic economic weapon for the modern age. Used in the manufacturing of products ranging from mobile phones to jet fighter engines, REEs have become the new “oil” of today in terms of economic and ...
Lackner, Daniela, McEwen-Fial, Susan
core  

Er doped oxide nanoparticles in silica based optical fibres [PDF]

, 2009
Erbium doped materials are of great interest in optical telecommunications due to the Er3+ intra-4f emission at 1.54 ?m. Erbium doped fibre amplifiers (EDFA) were developed in silica glass because of the low losses at this wavelength and the reliability ...
Blanc, Wilfried, Dussardier, Bernard, Paul, M. C.   +2 more
core   +3 more sources

Leaching of rare earth elements (REEs) and impurities from phosphogypsum: A preliminary insight for further recovery of critical raw materials

Journal of Cleaner Production, 2019
Phosphogypsum is a pollutant waste generated by the fertilizer industry. Managing this pollutant is challenging due to the large volumes generated worldwide. A promising route is the valorization of phosphogypsum to recover rare earth elements.
C. R. Cánovas, S. Chapron, G. Arrachart, S. Pellet-Rostaing   +3 more
semanticscholar   +1 more source

Occurrence State of Rare Earth Elements in the Paleo-Weathering Crust of the Tieling Formation, Northern Hebei Province by X-Ray Diffraction and Electron Probe Microanalysis

Yankuang ceshi
In recent years, the discovered paleo-weathering crustal rare earth ores have the advantages of stability and easy mining. However, due to the low degree of research on their element occurrence state, the study of the enrichment mechanism of the deposits
Haiyan CHEN, Yunqiang ZHANG, Xiangju MAO, Ruihong LI   +3 more
doaj   +1 more source

Low cost, formable, high T(sub c) superconducting wire [PDF]

, 1991
A ceramic superconductivity part such as a wire is produced through the partial oxidation of a specially formulated copper alloy in the core. The alloys contain low level quantities of rare earth and alkaline earth dopant elements. Upon oxidation at high
Smialek, James L.
core   +1 more source

Chemical speciation and complexation modeling of trace and rare earth elements in groundwater of Oban Massif and Mamfe mMbayment southeastern Nigeria

Chemical Speciation & Bioavailability, 2018
Chemical speciation was carried out on trace and rare earth elements on trace and rare earth elements data on water samples in Oban Massif and Mamfe Mbayment southeastern Nigeria. Product moment correlation showed significant correlation at r>0.7 between
Gregory Udie Sikakwe, Ama Otele, Bridget Ndidi Ozibo   +2 more
doaj   +1 more source

Cation exchange testsof natural zeoliteswith rare earth elements [PDF]

, 2018
he present work aims to analyze the effectiveness of natural zeolites for the concentration of certain elements in the rare earth group, as well as some associated cations. The work has been centered on four samples of natural zeolites from Cuba that are
Canoira López, Laureano, Cháves, Sandra, Costafreda Mustelier, Jorge Luis, Del Barrio, Santiago, Martín Sánchez, Domingo Alfonso   +4 more
core  

Preparation of Reference Material for Deep-Sea Rare Earth-Enriched Sediments in the Pacific Ocean

Yankuang ceshi
Rare earth elements play a key role in industrial developments. However, there are few sediment reference materials of rare-earth elements and yttrium (together called REYs) worldwide.
Aimei ZHU, Xuefa SHI, Jihua LIU, Hongmin WANG, Xiaojing WANG, Yazhi BAI, Jingjing CUI   +6 more
doaj   +1 more source