scholarly journals Structural and optical properties of europium doped Y2O3 nanoparticles prepared by self-propagation room temperature reaction method

2013 ◽  
Vol 37 (1) ◽  
pp. 39-45 ◽  
Author(s):  
Sanja Ćulubrk ◽  
Vesna Lojpur ◽  
Željka Antić ◽  
Miroslav D. Dramićanin
Keyword(s):  
Room Temperature ◽  
Unit Cell Volume ◽  
Synthesis Method ◽  
Optical Characterization ◽  
Oxide Nanoparticles ◽  
Temperature Reaction ◽  
Structural And Optical Properties ◽  
Red Emission ◽  
Reaction Method ◽  
Yttrium Oxide Nanoparticles

Abstract Europium-doped yttrium oxide nanoparticles with different doping concentrations were prepared by self-propagation room temperature reaction method. This simple synthesis method provides particles in the range of 12nm to 50 nm, depending on the temperature of calcination. In all cases, the nanopowders showed intense red emission upon excitation with ultraviolet radiation. Structural and optical characterization showed that the nanoparticles obtained after calcination at 1100°C have smaller unit cell volume and microstrain and longer emission lifetimes compared to the nanoparticles obtained after calcination at 600°C and 800°C. The maximal emission intensity was found for the sample doped with 5at% of Eu3+.

scholarly journals Thermoelectric properties of LaFeO3 system with doped Ti, Co, Cu

2017 ◽  
Vol 126 (1B) ◽  
pp. 147
Author(s):  
Nguyen Thi Thuy
Keyword(s):  
Electron Microscope ◽  
Solid State ◽  
Room Temperature ◽  
Unit Cell Volume ◽  
Single Phase ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Reaction Method ◽  
X Ray ◽  
Scanning Electron

<p><strong>Abstract: </strong>LaFeO<sub>3</sub> system with doped Ti, Co, Cu was manufactured by solid state reaction method, it was sintered at 1250<sup>0</sup>C and 1290<sup>0</sup>C in 10 hours with a heating rate of 3<sup>0</sup>C/min. Using X-ray diffraction and Scanning Electron Microscope (SEM) to examine the structure, it reveals that samples are single-phase and orthogonal-perovskite structure describing by the Pnma space group, the unit cell volume of the samples increases when Ti, Co, Cu are doped to replace ion Fe<sup>+3</sup>. The size of particle increase while raising the temperature of sintering. Measuring the resistance which depends on temperature between the room temperature and 1000K, it can be seen that when doping Co, Cu with the nominal component La(Fe<sub>0,2</sub>Co<sub>0,2</sub>Ti<sub>0,6</sub>)O<sub>3</sub> and La(Fe<sub>0,4</sub>Cu<sub>0,1</sub>Ti<sub>0,5</sub>)O<sub>3 </sub>, the conductivity of samples increases respectively. Especially, the conductivity of Cu doped sample is higher than two other samples, and reach the highest conductivity at about 900<sup>0</sup>C, Seebeck coefficient S of La(Fe<sub>0.6</sub>Ti<sub>0.4</sub>)O<sub>3</sub> can be change from positive to negative at the temperature of around 700<sup>0</sup>C.</p>

Adsorption of Lead Ions in Aqueous Solution Using Yttrium Oxide Nanoparticles

2012 ◽  
Vol 16 ◽  
pp. 83-87
Author(s):  
Sodeh Sadjadi ◽  
Seyed Javad Ahmadi ◽  
Morteza Hosseinpour
Keyword(s):  
Yttrium Oxide ◽  
Heavy Metal Ions ◽  
Synthesis Method ◽  
Additional Treatment ◽  
Single Step ◽  
Lead Ions ◽  
Oxide Nanoparticles ◽  
Nano Structure ◽  
Supercritical Hydrothermal Synthesis ◽  
Yttrium Oxide Nanoparticles

By a single-step supercritical hydrothermal synthesis method, yttrium oxide nanoparticles were successfully prepared without additional treatment. Yttrium oxide nanoparticles were employed as an adsorbent to study the adsorption of some heavy metal ions. This study revealed that nano structure yttrium oxide was an effective adsorbent for removal of lead ions from aqueous solutions.

Structural and Optical Characterization of Samarium Doped Yttrium Oxide Nanoparticles

2009 ◽  
Vol 9 (11) ◽  
pp. 6747-6752 ◽  
Author(s):  
Ramasamy Srinivasan ◽  
Rajeswari Yogamalar ◽  
Ajayan Vinu ◽  
Katsuhiko Ariga ◽  
Arumugam Chandra Bose
Keyword(s):  
Yttrium Oxide ◽  
Optical Characterization ◽  
Oxide Nanoparticles ◽  
Yttrium Oxide Nanoparticles

Structural and optical properties of europium doped yttrium oxide nanoparticles for phosphor applications

2010 ◽  
Vol 496 (1-2) ◽  
pp. 472-477 ◽  
Author(s):  
R. Srinivasan ◽  
N. Rajeswari Yogamalar ◽  
J. Elanchezhiyan ◽  
R. Justin Joseyphus ◽  
A. Chandra Bose
Keyword(s):  
Optical Properties ◽  
Yttrium Oxide ◽  
Oxide Nanoparticles ◽  
Structural And Optical Properties ◽  
Yttrium Oxide Nanoparticles

Structural and Optical Characterization of ZnO Nanofilms Deposited by CBD-AμW

2015 ◽  
Vol 1766 ◽  
pp. 151-158 ◽  
Author(s):  
J. Díaz-Reyes ◽  
R. S. Castillo-Ojeda ◽  
J. E. Flores-Mena ◽  
J. Martínez-Juárez
Keyword(s):  
Room Temperature ◽  
Optical Characterization ◽  
Xrd Analysis ◽  
Photoluminescence Spectra ◽  
Structural And Optical Properties ◽  
X Ray ◽  
Room Temperature Photoluminescence ◽  
Glass Substrates ◽  
Corning Glass

ABSTRACTZnO was grown by Chemical Bath Deposition technique activated by microwaves (CBD-AμW) on corning glass substrates. The ZnO structural and optical properties are studied as a function of the urea concentration in the growth solution. ZnO chemical stoichiometry was determined by Energy-dispersive X-ray spectroscopy (EDS). The XRD analysis and Raman scattering reveal that ZnO deposited thin films showed hexagonal polycrystalline phase wurtzite type. The Raman spectra present four main peaks associated to the modes E2high, (E2high-E2low), E2low and an unidentified vibrational band observed at 444, 338, 104 and 78 cm-1. The E2low mode involves mainly Zn atoms motion in the unit cell and the E2high mode is associated to oxygen motion. The observed emission peaks in the room temperature photoluminescence spectra are associated at vacancies of zinc and oxygen in the lattice.

Fragmentation, Catenation, and Direct Functionalisation of White Phosphorus by a Uranium(IV)-Silyl-Phosphino-Carbene Complex

2021 ◽  
Author(s):  
Josef Boronski ◽  
John Seed ◽  
Ashley Wooles ◽  
Stephen Liddle
Keyword(s):  
Room Temperature ◽  
White Phosphorus ◽  
Temperature Reaction ◽  
Carbene Complex

Room temperature reaction of the uranium(IV)-carbene [U{C(SiMe3)(PPh2)}(BIPMTMS)(μ-Cl)Li(TMEDA)(μ-TMEDA)0.5]2 (1, BIPMTMS = C(PPh2NSiMe3)2) with white phosphorus (P4) produces the organo-P5 compound [P5{C(SiMe3)(PPh2)}2][Li(TMEDA)2] (2) and the uranium(IV)-methanediide [U{BIPMTMS}{Cl}{μ-Cl}2{Li(TMEDA)}] (3). This is an unprecedented...

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