Papers by Keyword: Rare Earth (RE)

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Authors: G. Pasold, F. Albrecht, Joachim Grillenberger, Ulrike Grossner, C. Hülsen, R. Sielemann, W. Witthuhn
Authors: Lin Yan Jia, Zhong Bao Shao, Yan Wen Tian
Abstract: The pure phase red phosphor yttrium borate doped with Eu3+ was prepared by a new solid state reaction named high temperature ball milling method. The phosphor was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and luminescence spectra. The results show that the single phase YBO3:Eu3+ phosphor was obtained at 600°C, which is obviously decreased in contrast to conventional solid state reaction method. The particles are approximately nanometer size with narrow distribution range and spherical morphology. In emission spectra, the strongest peak at 597nm is due to the transition 5D0→7F1 of Eu3+ ions under 394nm monitoring wavelength. The luminescent properties of YBO3:Eu3+ phosphor with 25 mol% doping concentration of Eu3+ is optimal.
Authors: Li Yuan Niu, Zi Mu Shi, Ji Jing Lin, Yong Li, Lin Chao Xu, Lan Zhao
Abstract: Foam magnesium alloy was an idea substitute of hard tissue of human bodies because its elasticity module was close to the bone of human. In the paper, foam degradable magnesium alloys were prepared by “Press-Dissolution-Vacuum sintering-Hot treatment-Aging” powder manufacturing process firstly. Then samples were coated by immersion in a bath containing phosphate and rare earths lanthanum. Results show that, Mg-0.9Mn foam magnesium alloys after hot treatment had better anticorrosion performance; and coated foam magnesium alloys form the bath with phosphate lanthanum chloride had lower rate of degradation.
Authors: Kyota Uheda
Abstract: Multiternary nitride and oxynitride compounds doped with rare earth ions, such as Eu2+ and Ce3+ have been enthusiastically applied as various phosphors to white LED. New red and green phosphors, CaAlSiN3:Eu and Ba3Si6O12N2:Eu, have been successfully synthesized, recently. The red phosphor has intense emission around 650 nm under two different irradiations at 405 and 455 nm from blue- and near UV-LED chips, respectively; while strong emission is observed around 520 nm from the green phosphor. Both phosphors also show small thermal quenching over the temperatures up to 150 °C. In addition, both LaSi3N5:Ce and La3Si8O4N11:Ce in lanthanum silicon nitride and oxynitride were examined as candidates for a blue phosphor in white LED with near UV-LED chip.
Authors: Zhuang Li, Di Wu, Wei Lv
Abstract: In this paper, free cutting austenitic stainless steel containing rare earths was investigated. The machinability tests were conducted by using an YDC-Ⅲ85 dynamometer on a CA6164 lathe. The metallurgical properties, machinability and mechanical properties of lead-free “green steel” were compared with those of the conventional austenitic stainless steel. The results have shown that globular shape MnS inclusions were obtained, and rare earths elements were enwrapped in sulfides. The machinability of austenitic stainless steel containing sulfur and rare earth was improved. A satisfactory mechanical property was attributed to the formation of globular shape sulfides. Lead can be replaced by sulfur and rare earth, and environmentally undesirable substances can be eliminated.
Authors: Chun Yang, Xiang Rong Liu, Li Na Wang, Wen Sheng Shen, Dao Wu Yang
Abstract: Thirteen novel complexeswere synthesized using this method, by employing the designed ligand o-carboxylbenzaldehyde-2-pyrroleformylhydrazone (H2L). Elemental analysis, molar conductivity,Fourier transform infrared (FTIR) spectracharacterizations show that the composition formula of the complexes is RE(HL)(H2L)•2H2O (where RE=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb and Y). The thermal decomposition of the thirteen complexes was studied by Subscript textTG-DTG analysis and their apparent activation energies (E) were calculated by Kissinger’s and Flynn-Wall-Ozawa’s methods.
Authors: Chen Ma, Ying Hui Wang, Mu Qin Li, Li Jie Qu
Abstract: Rare earth/calcium phosphate composite coatings were fabricated on the surface of Ti-6Al-4V by micro-arc oxidation (MAO) technique. The wear properties and corrosion resistant of rare earth/ calcium phosphate composite coatings in the simulated body fluid (SBF) have been investigated and the bioactivity of the composite coatings were evaluated. The results show that the friction coefficient of the composite coatings in the SBF is only 0.15~0.18 and the anode polarization potential of the coating has been obviously enhanced about 0.18V compared with that of coatings of calcium phosphate coatings. So the composite coatings have excellent wear and corrosion resistant properties. XRD analysis indicates that the composite coatings can induce hydroxyapatite to form on its surface after soaked in SBF for 9d, which shows that the composite coatings own good bioactivity.
Authors: Jia Yue Sun, Bing Xue, Guang Chao Sun, Dian Peng Cui, Hai Yan Du
Abstract: The upconversion (UC) luminescence properties of phosphor Tm3+/Yb3+ co-doped Gd2Mo3O9were investigated in detail. Tm3+/Yb3+ co-doped Gd2Mo3O9was prepared by solid-state reaction method using Na2CO3 as flux and characterized by powder X-ray diffractometry. Under 980nm excitation, Tm3+/Yb3+ co-doped Gd2Mo3O9has exhibited a weak red emission near 651nm and strong blue emission at 476nm. Tm3+/Yb3+ co-doped Gd2Mo3O9phosphor has been considered as a better candidate in solid-state lighting applications.
Authors: A.P.B. Tufaile, Abel D. Santos, Y. Souche, V. Novosad
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