Rare earth elements

Xem 1-15 trên 15 kết quả Rare earth elements
  • Metallic fuel has been considered for sodium-cooled fast reactors because it can maximize the uranium resources. It generates rare earth elements as fission products, where it is reported by aggravating the fuelecladding chemical interaction at the operating temperature. Rare earth elements form a multicomponent alloy (CeeNdePreLaeSmeetc.) during reactor operation, where it shows a higher reaction thickness than a single element.

    pdf8p minhxaminhyeu3 25-06-2019 2 0   Download

  • Objectives of the dissertation: Successfully synthesis polymers containing suitable funtional groups to seperate the light rare earth element (La, Nd, Pr, and Ce); evaluted the efficiency of polymers on seperating light rare earth element; evaluated the ability of polymers on separating each of the rare earth metal ions on the ion exchange column.

    pdf27p xacxuoc4321 09-07-2019 2 0   Download

  • Volume 41 of the Handbook on the Physics and Chemistry of Rare Earths adds four chapters to the series: two focus on nanoscale rare-earth mate- rials, while the other two are concerned with divergent topics—the arrangement of the rare-earth elements in the periodic table, and the higher order rare-earth chalogenide compounds with the elements of the 14th group and also In. The first chapter (248) discusses the various proposals suggested for the location of the rare-earth elements in the periodic table from the time of Mendeleev to the present day.

    pdf560p banhkem0908 24-11-2012 53 16   Download

  • p 01-01-1970   Download

  • p 01-01-1970   Download

  • The first chapter (236) in this volume of the Handbook on the Physics and Chem- istry of Rare Earth is a recapitulation of the scientific achievements and contri- butions made by the late Professor LeRoy Eyring (1919–2005) to the science of the lanthanide oxides in which the lanthanide element has a valence equal to or greater than three. Although LeRoy had a broad range of interests in the chemistry of the rare earths and actinides the main focus of his outstanding scientific career was concerned with the lanthanide higher oxides. This chapter was written by Dr.

    pdf469p banhkem0908 24-11-2012 66 6   Download

  • The water samples were taken from the streams, natural tap and thermal water intakes localized in the studied deposit and surrounding region. The 238U, 234U, 228Ra, 226Ra concentrations in the water samples were prepared by the adequate radiochemical procedures and measured using an alpha spectrometer coupled with silicon semiconductor detector and a/b liquid scintillation counter. In the stream water, the concentrations of both 226Ra and 228Ra vary from 100 to above 300 mBq/L, while in the natural tap and thermal waters they amount to tens mBq/L.

    pdf13p meolep1 28-11-2018 8 0   Download

  • 5 Calcium The rare earth element calcium is one of the most abundant elements in the lithosphere; it is readily available in most soils; and it is a macronutrient for plants, yet it is actively excluded from plant cytoplasm.

    pdf24p trasua1 21-09-2010 78 12   Download

  • The study on solvent extraction of rare earth elements such as Nd, Y from nitric acid solutions with triphenylphosphin oxide (TPPO) has been studies. The influence of various factors such as concentrations of triphenylphosphin oxide, nitric acid and rare earth elements on the distribution coefficient has been studied.

    pdf3p uocvong04 24-09-2015 24 2   Download

  • The complexes Ln(Leu)3ImCl3.3H2O (Ln: Eu, Yb; Leu: L-leucine; Im: imidazole) have been synthesized and characterized by the elemental analysis method , IR spectra and thermal analysis. IR spectra indicated that the rare earth ions are coodinated by both the oxygen atom from the COOgroup and the nitrogen atom from the NH2 group from L-leucine and coodinated with the 3-nitrogen atom for imidazole. The complexes thermal dissociation.

    pdf6p thicrom3006 31-03-2018 9 0   Download

  • Melting parameter modeling shows the Nghia Dan melts generated from about 3 - 4% partial melting of a combined garnet- spinel- lherzolite source between a pressure range of 20 to 25 Kb (about 75 km deep). The parameters are consistent with the low SiO2 and high trace element, including the rare earth, contents in the Nghia Dan basalts. High FeO*, TiO2, CaO and Sr may also be a result of interaction with mafic components in the lithospheric mantle by the mantle-derived melts on the way to the surface.

    pdf0p meolep4 02-01-2019 8 0   Download

  • Assadi et al. Nanoscale Research Letters 2011, 6:357 NANO REVIEW Open Access Structural and electronic properties of Eu- and Pd-doped ZnO Mohammad Hussein Naseef Assadi1,2, Yuebin Zhang2, Rong-Kun Zheng1, Simon Peter Ringer1 and Sean Li2* Abstract Doping ZnO with rare earth and 4d transition elements is a popular technique to manipulate the optical properties of ZnO systems. These systems may also possess intrinsic ferromagnetism due to their magnetic moment borne on 4f and 4d electrons.

    pdf7p dauphong13 09-02-2012 49 5   Download

  • The complexes of some rare earths with DL-2-amino-n-butyric acid were synthesized. The solid complexes have the general formula [Ln(Hbu)4]Cl3 [Ln: Pr, Nd, Sm, Eu, Gd and Hbu: CH3CH2CHNH2COOH]. The structure of the complexes have been recognised by the basic of elemental analysis, conductivity measurements, IR spectra and thermal analysis methods. It was found that the DL-2-amino-n-buryic acid utilized amino nitrogen and carboxyl oxygen for bonding.

    pdf5p uocvong01 24-09-2015 28 2   Download

  • Introduction Lead is a rare element present in the earth’s crust in a 1.4 Â 10À3% (w/w). It is a toxic heavy metal that exists only in a cubic close-packed metallic form. It shows the preference for the divalent state with electronic configuration [Xe]4f145d106s2 and low stability of the Pb–Pb covalent bond. Lead(IV) in solution is unstable (electronic configuration: [Xe]4f145d10). The most important Pb ore is galena (PbS). Other lead ores are anglesite (PbSO4), cerussite (PbCO3), mimetesite (Pb5(AsO4)3Cl), and pyromorphite (Pb5(PO4)3Cl). ...

    pdf10p congdat261 02-12-2010 68 8   Download

  • "In the time when nothing which was called heaven existed above, and when nothing below had as yet received the name of earth,* Apsu, the Ocean, who first was their father, and Chaos-Tiâmat, who gave birth to them all, mingled their waters in one, reeds which were not united, rushes which bore no fruit."** Life germinated slowly in this inert mass, in which the elements of our world lay still in confusion: when at length it did spring up, it was but feebly, and at rare intervals, through the hatching of divine couples devoid of personality and almost without form.

    pdf124p nhokheo9 06-05-2013 32 3   Download



p_strKeyword=Rare earth elements

nocache searchPhinxDoc


Đồng bộ tài khoản