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Copper nanoparticles enhanced luminescence of Eu3+ doped lead tellurite glass ceramics
摘要： Structural, optical and magnetic properties of some lead tellurite glass ceramics doped with europium(III) ions and co-doped with fixed amounts of metallic copper nanoparticles (CuNPs) or copper(II) ions (via CuO) were investigated. Samples in the (Eu2O3)x·(TeO2)80·(PbO)(19.7-x)·(CuNPs)0.3 and (Eu2O3)x·(TeO2)80·(PbO)(19.7-x)·(CuO)0.3 systems with 0 ≤ x ≤ 10 mol% were obtained and investigated for the first time. Several techniques such as X-ray diffraction, UV-VIS, EPR and luminescence spectroscopies and density and magnetic susceptibility measurements were used in order to characterize the samples. XRD data show that the samples with low Eu2O3 contents (x ≤ 1 mol%) are amorphous while for higher europium oxide contents (x > 1 mol%) are glass ceramics. They also reveal that increasing the Eu2O3 content of samples the symmetry around the europium ions changes from face centered cubic to monoclinic. These symmetry changes are confirmed by the photoluminescence data. In addition, photoluminescence data show that the co-doping with metallic copper nanoparticles enhances the emission peaks of europium ions. UV-VIS absorption spectra show the presence of six coordinated copper (II) ions located at sites with a distorted octahedral symmetry. The EPR data confirm the presence of copper (II) ions in all the studied samples. Magnetic susceptibility measurements suggest the presence of europium ions in both their 3+ and 2+ valence states and evidence an important clustering tendency of europium ions even for low Eu2O3 contents.
关键词： EPR,UV-VIS,Photoluminescence,Magnetic susceptibility,Lead-tellurite glass ceramics,XRD
更新于2025-09-23 15:21:01
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Effect of (102) Diffracted Peak on Magnetic, Photoelectric, and Adhesive Characteristics of Fe <sub/>2</sub> Si Films
摘要： Fe2Si films with thicknesses from 100 nm to 600 nm underwent the following processes; (a) as-deposited films were maintained at room temperature (RT); (b) deposited films were post-annealed at 150 °C for 1 h, and (c) deposited films were post-annealed at a treatment temperature of 250 °C for 1 h. The X-ray diffraction (XRD) patterns of Fe2Si included significant (102) and (200) diffractions with corresponding peaks at 2θ are 44° and 53°, respectively. The (102) diffracted intensity and grain size of thicker and post-annealed Fe2Si thin films exceeded those of thinner and as-deposited Fe2Si thin films. The Fe2Si (102) peak revealed magneto-crystalline anisotropy, which reduced electrical resistivity and was associated with the highest low-frequency alternative-current (ac) magnetic susceptibility (χac). The maximum value of χac was reached at a thickness of 600 nm at the optimal frequency (fres) of 10 Hz, which generated maximized spin sensitivity. The resistivity (ρ) declined as the Fe2Si thickness and post-annealing temperature increased, because grain boundaries and the thin-film surface scattered the electrons. The 600 nm-thick Fe2Si thin film that was post-annealed at 250 °C had the lowest ρ of around 2.1 × 10^4 μΩ·cm. The as-deposited Fe2Si thin film with a thickness of 100 nm had the highest transmittance of approximately 48%. The maximum transmittance decreased slightly as the thickness increased and upon post-annealing. The surface energy of the as-deposited Fe2Si films exceeded those of post-annealed films, revealing that the adhesion of as-deposited Fe2Si films was stronger than that of post-annealed films owing to the degree of crystallinity.
关键词： Adhesion,Magneto Crystalline Anisotropy,Photoelectrical Property,Low-Frequency Alternative-Current Magnetic Susceptibility (χac)
更新于2025-09-19 17:15:36
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Synthesis and Characterization of Substituted Metal(II)-octa- MethoxyphenylImino Phthalocyanine Pigments
摘要： The synthesis, spectral and magnetic susceptibility on symmetrically substituted metal(II)-octa-methoxyphenyl imino phthalocyanine by condensing octa amino phthalocyanines with o-anisaldehyde are described. The dark green colour octa amino phthalocyanine derivatives were characterized by electronic, IR, elemental analysis, magnetic susceptibility, powder X-ray diffraction and thermo gravimetric analysis (TGA) studies to structural integrity, check the purity and crystalline properties of the pigments. The variation of magnetic moment as function of field strength 2.20 to 4.01 kg indicated the presence of intermolecular co-operative effect
关键词： TGA,Magnetic susceptibility,IR,Electronic,XRD,Octamethoxy imino phathalocynaine
更新于2025-09-19 17:15:36
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Radiation Resistance of (HgSe)3(In2Se3)<Mn>
摘要： We present the results of studies of the effect of electron irradiation on the electrophysical parameters of (HgSe)3(In2Se3)<Mn> crystals, which are semimagnetic semiconductors with stoichiometric vacancies. It is shown that irradiation of (HgSe)3(In2Se3)<Mn> with high-energy electrons (Ee = 10 MeV, dose D = 1016 cm–2) has little effect on the electrophysical and magnetic properties, which indicates their high radiation resistance.
关键词： cluster,magnetic susceptibility,crystal,electrical conductivity
更新于2025-09-09 09:28:46