Rare Earth Ions in Advanced X-ray Imaging Materials

2005 ◽  
pp. 500-529 ◽  
Author(s):  
M. Z. Su ◽  
W. Zhao
Keyword(s):  
Rare Earth ◽  
Rare Earth Ions ◽  
X Ray ◽  
X Ray Imaging

scholarly journals Determination of the relative concentrations of rare earth ions by x-ray absorption spectroscopy: Application to terbium mixed oxides

1986 ◽  
Vol 47 (4) ◽  
pp. 413-416 ◽  
Author(s):  
G. van der Laan ◽  
J.C. fuggle ◽  
M.P. van Dijk ◽  
A.J. Burggraaf ◽  
J.-M. Esteva ◽  
...  
Keyword(s):  
Rare Earth ◽  
Absorption Spectroscopy ◽  
Mixed Oxides ◽  
Rare Earth Ions ◽  
X Ray ◽  
X Ray Absorption

Synthesis, Morphology Control and Luminescent Properties of Rare Earth Ion-Doped CaWO4 Microstructures

2016 ◽  
Vol 16 (4) ◽  
pp. 4029-4034 ◽  
Author(s):  
Chunxia Liu ◽  
Lixia Yang ◽  
Dan Yue ◽  
Mengnan Wang ◽  
Lin Jin ◽  
...  
Keyword(s):  
Rare Earth ◽  
Uv Light ◽  
Luminescent Properties ◽  
Average Diameter ◽  
Rare Earth Ions ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
Rare Earth Ion ◽  
X Ray ◽  
Facile Hydrothermal Route

Rare earth ions (Tb3+, Eu3+) doped CaWO4 microstructures were synthesized by a facile hydrothermal route without using any templates and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) spectrum. The results indicate that the asprepared samples are well crystallized with scheelite structure of CaWO4, and the average diameter of the microstructures is 2∼4 μm. The morphology of CaWO4:Eu3+ microstructures can be controllably changed from microspheres to microflowers through altering the doping concentration of Eu3+ from 3% to 35%, and the microflowers are constructed by a number of CaWO4:Eu3+ nanoflakes. Under the excitation of UV light, the emission spectrum of CaWO4:Eu3+ is composed of the characteristics emission of Eu3+ 5D0-7FJ (J = 1, 2, 3, 4) transitions, and that of CaWO4:Tb3+ is composed of Tb3+ 5D4-7FJ (J = 6, 5, 4, 3) transitions. Both of the optimal doping concentrations of Tb3+ and Eu3+ in CaWO4 microstructures are about 5%.

X-ray absorption study of rare earth ions in Sr2MgSi2O7:Eu2+,R3+ persistent luminescence materials

2009 ◽  
Vol 31 (12) ◽  
pp. 1877-1879 ◽  
Author(s):  
Stefan Carlson ◽  
Jorma Hölsä ◽  
Taneli Laamanen ◽  
Mika Lastusaari ◽  
Marja Malkamäki ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Ions ◽  
Persistent Luminescence ◽  
Absorption Study ◽  
X Ray ◽  
X Ray Absorption

SITE MULTIPLICITY OF RARE EARTH IONS IN III-NITRIDES

2004 ◽  
Vol 831 ◽  
Author(s):  
K.P. O'Donnell ◽  
V. Katchkanov ◽  
K. Wang ◽  
R.W. Martin ◽  
P.R. Edwards ◽  
...  
Keyword(s):  
Fine Structure ◽  
Rare Earth ◽  
Ion Implantation ◽  
Electron Emission ◽  
Optical Spectra ◽  
Rare Earth Ions ◽  
Lattice Location ◽  
X Ray ◽  
Low Concentrations ◽  
X Ray Absorption

ABSTRACTThis presentation reviews recent lattice location studies of rare earth (RE) ions in GaN by electron emission channelling (EC) and X-ray absorption fine structure (XAFS) techniques. These studies agree that RE ions at low concentrations (whether they are incorporated during growth or introduced later by ion implantation) predominantly occupy Ga substitutional sites, as expected from considerations of charge equivalence. We combine this result with some examples of the well-documented richness of optical spectra of GaN:RE3+ to suggest that the luminescence of these materials may be ascribed to a family of rather similar sites, all of which feature the REGa defect.

Effects of Acidity on Nitrogen-Heterocyclic Compounds with Rare Earth Coordination and the Structure of Protonated Phenanthroline

2011 ◽  
Vol 233-235 ◽  
pp. 2808-2811
Author(s):  
Huan Huan Li ◽  
Hai Bin Chu ◽  
Ying Nan Chen ◽  
Xiao Tao Fu ◽  
Hui Juan Sun ◽  
...  
Keyword(s):  
Rare Earth ◽  
Heterocyclic Compounds ◽  
Crystal Structure Analysis ◽  
Rare Earth Ions ◽  
Molecular Formula ◽  
X Ray Diffraction ◽  
Triclinic Space Group ◽  
X Ray ◽  
Rare Earth Coordination ◽  
Single Crystal Structure Analysis

2,3-bis(2-pyridyl)-5,6-dihydropyrazine and a protonated phenanthroline (Phen) have been synthesized and the structure of protonated Phen is established by X-ray diffraction single crystal structure analysis. The coordination reactions of Phen, 2,2'- bipyridine and 2,3-bis(2-pyridyl)-5,6-dihydropyrazine with rare earth ions in low pH have been studied. The results show that 2,3-bis(2-pyridyl)-5,6-dihydropyrazine is hydrolyzed to be 2,2’-pyridil and protonated ethylenediamine. Meanwhile, Phen combines with proton, which results that nitrogen atoms can not coordinate with rare earth ions. The molecular formula of protonated Phen is C12H8N2HCl·H2O. It crystallizes in the triclinic space group P -1 (2), with a = 7.1212(14) Å, b = 7.2786(15) Å, c = 20.817(4) Å, α = 90.00º, β = 96.69(3) º, γ = 90.00 º, V = 1071.65(379) Å3, Z = 4.

Development of X-ray protective garments from rare earth-modified natural rubber composites

2016 ◽  
Vol 49 (6) ◽  
pp. 527-544 ◽  
Author(s):  
Sreedha Sambhudevan ◽  
Balakrishnan Shankar ◽  
A Saritha ◽  
Kuruvilla Joseph ◽  
John Philip ◽  
...  
Keyword(s):  
Rare Earth ◽  
Natural Rubber ◽  
Filler Content ◽  
Rubber Composites ◽  
Suitable Alternative ◽  
X Ray ◽  
Toxic Material ◽  
X Ray Imaging ◽  
Natural Rubber Composites

Commonly used shielding materials while X-ray imaging by clinical persons is based on lead but incessant contact with this toxic material can pave way to severe health problems. Polymer composites, embedded with lead-free additives, especially based on natural rubber can be chosen as a suitable alternative candidate due to its lightweight, cost-effectiveness and capability to absorb regular energy region of X-ray used in medical imaging. Rubber composites were prepared with modified rare earth oxides at different filler loadings. The characterization of the filler reveals that their size falls in the nanoregime, which, in turn, supplemented to the superior properties of the composites. Mechanical properties were found to increase with filler content. X-ray shielding studies were done at different tube voltages and thicknesses and the results prove the efficacy of materials to be considered as a promising shielding resource.

X-ray spin form factors of rare-earth ions

2002 ◽  
Vol 66 (22) ◽  
Author(s):  
H. Adachi ◽  
H. Miwa
Keyword(s):  
Rare Earth ◽  
Form Factors ◽  
Rare Earth Ions ◽  
X Ray

scholarly journals Photoluminescence Enhancement of Titanate Nanotubes by Insertion of Rare Earth Ions in Their Interlayer Spaces

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Thalles M. F. Marques ◽  
Cleanio Luz-Lima ◽  
Marco Sacilloti ◽  
Kazunori Fujisawa ◽  
Nestor Perea-Lopez ◽  
...  
Keyword(s):  
Optical Properties ◽  
Rare Earth ◽  
Strong Dependence ◽  
Sodium Titanate ◽  
Rare Earth Ions ◽  
Titanate Nanotubes ◽  
Visible Range ◽  
Exchange Reactions ◽  
X Ray ◽  
Transmission Electron

The optical properties of titanate nanotubes (TiNts) intercalated with rare earths (RE) ions were intensively investigated in this study. To prepare the nanomaterials, sodium titanate nanotubes (Na-TiNts) were submitted to ion exchange reactions with different rare earth elements (RE: Pr3+, Er3+, Nd3+, and Yb3+). To the best of our knowledge, it is the first time that these RE-TiNts were synthesized. All samples were characterized by Raman spectroscopy, X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDS). Furthermore, the optical properties were examined using photoluminescence spectroscopy (PL) and UV-Vis-NIR absorption spectroscopy. The PL intensity (visible range) of the RE-TiNt samples showed a strong dependence when the temperature was decreased down to 20 K. This PL enhancement probably was promoted by electronic modifications in titanate layer band gap and/or interface charge transfers due to RE ions intercalation.

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