Fe3O4 magnetic nanoparticles (Fe3O4-MN) capped with either oleic acid (Fe3O4-OA-MN) or polyethylene glycol (Fe3O4-PEG-MN) were prepared by a co-precipitation method. From X-ray diffraction studies, the average crystallite sizes of Fe3O4-MN, Fe3O4-OA-MN and Fe3O4-PEG-MN found to be 12, 6 8 nm, respectively. A reduction in agglomeration particles was observed when (MN) (OA) (PEG), as confirmed transmission electron microscopy study. Magnetization these MN almost zero at room temperature...

Ce(3+)- and Eu(3+)-doped YPO(4) nanorods have been prepared at relatively low temperature (120 degrees C). A detailed investigation of the role Ce(3+) concentration up to 10 atom % on luminescence intensity Eu(3+) in has carried out. Phase transformation from a tetragonal hexagonal structure occurs with increasing concentrations, water molecules are also associated during phase transformation. Thermal study shows that can be retained 800 C structure. Interestingly, returns annealing above...

When Eu(3+) ions occupy Ca(2+) sites of CaMoO(4), which has a body centered tetragonal structure with inversion symmetry, only the magnetic dipole transition ((5)D(0)→(7)F(1)) should be allowed according to Judd-Ofelt theory. Even if there are few distortions in environment, its intensity more than that electric ((5)D(0)→(7)F(2)). We report here opposite effect experimentally and ascribe this polarizability MoO(4) tetrahedron, is neighboring EuO(8) (symmetric environment). The contribution...

YPO(4) nanoparticles codoped with Eu(3+) (5 at. %) and Bi(3+) (2-10 have been synthesized by a simple coprecipitation method using polyethylene glycol-glycerol mixture, which acts as capping agent. It has found that the incorporation of ions into YPO(4):Eu(3+) lattice induces phase transformation from tetragonal to hexagonal, also significant decrease in luminescence intensity was observed. This is related association water molecules hexagonal nonradiative process surrounding around...

In the present manuscript it is demonstrated that BiPO(4) a better alternative to lanthanide phosphate host for making ion-based luminescent materials. Hexagonal and monoclinic forms of phase were prepared based on reaction Bi(3+) PO(4)(3-) ions in ethylene glycol medium at 100 185 °C, respectively. From differential thermal analysis (DTA) studies confirmed difference nucleation mechanism rather than transition responsible formation low temperatures (125 °C). Monoclinic quite stable random...

Lanthanide ions (Ln3+ = Eu3+, Dy3+, Tm3+) doped YVO4 and silica coated YVO4:Ln3+ (YVO4:Ln3+@SiO2) nanoparticles have been prepared by a microemulsion route using Cetyl trimethyl ammonium bromide (CTAB)/n-butanol/hexane/water. Average crystallite sizes of annealed at 500 900 °C are found to be ∼30 ∼80 nm, respectively. Successful coating the on core could observed transmission electron microscopy. The silanol group (SiO–H) is present in samples (heated up °C) acts as luminescence quencher....

GdVO4 : Ln3+ (Ln3+ = Dy3+, Eu3+, Sm3+, Tm3+) nanoparticles are prepared by a simple chemical route at 140 °C. The crystallite size can be tuned varying the pH of reaction medium. Interestingly, is found to increase significantly when increases from 6 12. This related slower nucleation formation with VO43− present in solution. luminescence study shows an efficient energy transfer vanadate absorption and thereby enhanced emissions obtained. A possible mechanism different values suggested this...

Crystalline nanoneedles of Eu3+-doped GdPO4 and covered with shell (core shell) have been prepared at relatively low temperature 150 °C in ethylene glycol medium. From luminescence study, asymmetric ratio Eu3+ emission 612 nm (electric dipole transition) to 592 (magnetic is found be less than one. Maximum was observed from the nanoparticles concentration 5 at. %. For a fixed doping, there an improvement intensity for core-shell compared that core. This has attributed effective removal...

Magnetic nanoparticles based hyperthermia therapy is a possible low cost and effective technique for killing cancer tissues in the human body. Fe3O4 Fe3O4@YPO4:5Eu hybrid magnetic are prepared by co-precipitation method their average particle sizes found to be ∼10 25 nm, respectively. The particles spherical, non-agglomerated highly dispersible water. crystallinity of as-prepared YPO4:5Eu sample more than nanoparticles. chemical bonds interaction between confirmed through FeO-P....

Monodispersed Fe3O4 magnetic nanoparticles (MNPs) having size of 7 nm have been prepared from iron oleate and made water dispersible by functionalization for biomedical applications. Three different reactions employing thioglycolic acid, aspartic acid aminophosphonate were performed on oleic coated Fe3O4. In order to achieve a control particle size, the pristine heated in presence ferric which led increase 11 nm. Reaction parameters such as rate heating, reaction temperature duration heating...

Eu(3+) co-doped Y(2)O(3):Tb nanoparticles were prepared by the combustion method and characterized for their structural luminescence properties as a function of annealing temperatures relative concentration Tb(3+) ions. For Y(2)O(3):Eu,Tb annealed at 600 1200 °C, variation in intensity excitation transitions between (7)F(6) ground state low spin high 4f(7)5d(1) excited states is explained due to combined effect distortion around Y(3+)/Tb(3+) YO(6)/TbO(6) polyhedra size nanoparticles....

GdVO 4 nanoparticles doped with Dy3+ have been prepared using urea hydrolysis method in ethylene glycol medium. Linear decrease the unit cell volume indicates quantitative substitution of Gd3+ lattice sites by GdVO4. The luminescence intensity electric dipole transition at 573 nm is more than that magnetic 483 nm. This has attributed to asymmetric environment ion Luminescence decreases increasing concentrations due concentration quenching. supported lifetime decay studies. There no particle...

Eu 3 + doped Gd2O3 particles have been prepared by glycine-nitrate combustion route. Eu–O charge transfer peak shifts to higher wavelength from 260 273 nm with increasing Eu3+ concentration, whereas the linewidth at half maximum intensity varies concentrations and annealing temperatures as well. Lifetime for D50 level of increases temperature 500 900 °C, this is related decreasing surface volume atomic ratio particles. Asymmetric defined electrical dipole transition that magnetic found be...

Abstract Nanoparticles of Tb 3+ ‐doped GdPO 4 (Tb = 0, 2, 5, 7, 10, and 20 atom‐%) have been prepared at a relatively low temperature 160 °C in ethylene glycol medium. The particles crystallize monoclinic structure with an average crystallite size 30–50 nm. From the luminescence study , magnetic dipole transition ( 5 D → 7 F ) 545 nm (green) was found to be more prominent than electric 6 484 (blue). Maximum intensity lifetime observed for atom‐% . Above decrease observed. This has attributed...

Nanoparticles of GdVO4 doped with Eu3+ and core/shell GdVO4:Eu3+/GdVO4 are prepared by urea hydrolysis method using ethylene glycol as capping agent well reaction medium at 130 °C. Unit cell volume increases when is indicating the substitution Gd3+ lattice sites Eu3+. From luminescence study, it confirmed that there no particle size effect on emission positions Optimum intensity found to be in 5–10 at. % Above these concentrations, decreases due concentration quenching effect. There an...

A sodium barium borosilicate glass matrix with a higher solubility of sulfate has been developed recently at Bhabha Atomic Research Centre for vitrification bearing high‐level nuclear waste. We report here the studies carried out to understand influence ion on three‐dimensional network. Experiments were base samples loaded varying amounts SO 4 2− (0–5 mol%). Phase separation revealed that as much 3 mol% can be within without any phase separation, however, beyond this limit BaSO (barite)...