Search results for: S. Asiri

Items from 1 to 15 out of 15 results

article

Hydrothermal synthesis of CoyZnyMn1-2yFe2O4 nanoferrites: Magneto-optical investigation

S. Asiri, M. Sertkol, S. Guner, H. Gungunes, more

Ceramics International > 2018 > 44 > 5 > 5751-5759

Manganese ferrites nanoparticles (NPs) substituted with both Co²⁺ and Zn²⁺ simultaneously (Co_yZn_yMn_1-2yFe₂O₄ NPs for y=0.0 to 0.5), have been produced by hydrothermal approach. The substitution with both Co²⁺ and Zn²⁺ ions on the structure, spectroscopic and magneto-optical properties of nanocrystalline MnFe₂O₄ spinel ferrites have been analyzed in detail. The formation of spinel phase and structural...

article

Magneto-optical properties of BaCryFe12−yO19 (0.0 ≤ y ≤ 1.0) hexaferrites

S. Asiri, S. Güner, A.D. Korkmaz, Md. Amir, more

Journal of Magnetism and Magnetic Materials > 2018 > 451 > C > 463-472

In this study, nanocrystalline BaCr_yFe_12−yO₁₉ (0.0 ≤ y ≤ 1.0) hexaferrite powders were prepared by sol–gel auto combustion method and the effect of Cr³⁺ ion substitution on morphology, structure, optic and magnetic properties of Barium hexaferrite were investigated. X-ray powder diffraction (XRD) analyses confirmed the purity of all samples. The XRD data shows that the average crystallite size lies...

article

Effect of Annealing Temperature on Magnetic and Mössbauer Properties of ZnFe₂O₄ Nanoparticles by Sol-gel Approach

Md. Amir, H. Gungunes, A. Baykal, M. A. Almessiere, more

Journal of Superconductivity and Novel Magnetism > 2018 > 31 > 10 > 3347-3356

In this study, spinel ZnFe₂O₄ nanoparticles (NPs) were synthesized by citrate sol-gel route using nickel nitrates, ferric nitrates and citric acid by annealing at 900, 1000, and 1100^∘C. We reported the structural and magnetic properties (including Mössbauer analysis) for anisotropy ZnFe₂O₄ NPs annealed at different temperatures. Fourier transform infrared (FT-IR) and X-ray powder diffraction (XRD)...

article

The Temperature Effect on Magnetic Properties of NiFe₂O₄ Nanoparticles

S. Asiri, M. Sertkol, H. Güngüneş, Md. Amir, more

Journal of Inorganic and Organometallic Polymers and Materials > 2018 > 28 > 4 > 1587-1597

In this study, NiFe₂O₄ nanoparticles (NPs) were fabricated via auto citric acid sol–gel route at three different temperatures (900, 1000 and 1100 °C). X-ray diffraction (XRD) and Fourier transform infrared were utilized to analyze the structural properties of magnetic nanoparticles (MNPs). XRD patterns reflect the formation of spinel ferrites without the existence of any kind of secondary phases....

article

Structural, Optical and Mössbauer Study of Ba_1 − xCu_xFe₁₂O₁₉ (0.5 ≤ x) Nano Hexaferrites

S. Asiri, Md. Amir, S. Güner, H. Gungunes, more

Journal of Inorganic and Organometallic Polymers and Materials > 2018 > 28 > 4 > 1446-1456

In this study, a novel Ba_1−xCu_xFe₁₂O₁₉ (0.5 ≤ x) nano-hexaferrites were prepared by a simple and cost-effective sol–gel auto-combustion method using barium nitrates, iron nitrate, copper (II) acetate monohydrate and citric acid, and its structural, optical properties and hyperfine interactions were reported. Structural properties were analyzed through XRD (X-ray diffraction), Scanning electron microscopy...

article

Magnetic properties and Mössbauer spectroscopy of Cu-Mn substituted BaFe12O19 hexaferrites

A. Baykal, H. Güngüneş, H. Sözeri, Md. Amir, more

Ceramics International > 2017 > 43 > 17 > 15486- 15492

In this study, bimetallic (Cu-Mn) substituted M-type Ba_1-2xMn_xCu_xFe₁₂O₁₉ (0.0 ≤ x ≤ 0.1) hexaferrites were fabricated via sol-gel auto-combustion route. The effect of bimetallic substitution on structure, morphology and magnetism of BaFe₁₂O₁₉ was studied. Scanning Electron Microscopy confirm images reveal the nanosize of the prepared products with flake morphology. X-ray powder diffraction analysis...

article

Synthesis and Magnetic Characterization of Cu Substituted Barium Hexaferrites

S. Asiri, S. Güner, A. Demir, A. Yildiz, more

Journal of Inorganic and Organometallic Polymers and Materials > 2018 > 28 > 3 > 1065-1071

Cu²⁺ ion substituted nanocrystalline BaFe₁₂O₁₉ [Ba_1 − xCu_xFe₁₂O₁₉ (0.0 ≤ x ≤ 0.5)] hexaferrite powders were synthesized by sol–gel combustion route and its effects on structure, morphology and magnetic properties of barium hexaferrite (BaFe₁₂O₁₉) were presented. X-Ray Powder Diffraction (XRD), Scanning Electron Microscopy (HR-SEM), Transmission Electron Microscopy (HR-TEM) and Fourier Transform Infrared...

article

Synthesis and Characterization of Cu–Mn Substituted SrFe₁₂O₁₉ Hexaferrites

Md. Amir, A. Baykal, H. Gungunes, S. Asiri, more

Journal of Inorganic and Organometallic Polymers and Materials > 2018 > 28 > 1 > 212-222

In this study, bimetallic (Cu–Mn) substituted SrFe₁₂O₁₉ hexaferrites [Sr_1−2xMn_xCu_xFe₁₂O₁₉ (0.0 ≤ x ≤ 0.1)] were synthesized via sol–gel auto-combustion approach. The effect of bimetallic substitution on structure, morphology and magnetism of SrFe₁₂O₁₉ was investigated. SEM images divulge the nano-size of the prepared products with speck morphology. X-ray powder diffraction analysis affirmed their...

article

Ocular injuries secondary to alexandrite laser-assisted hair removal

Mohammed S. Asiri, Majed Alharbi, Trad Alkadi, Marwan Abouammoh, more

Canadian Journal of Ophthalmology / Journal Canadien d'Ophtalmologie > 2017 > 52 > 2 > e71-e75

The aim of this study was to describe the clinical manifestations and outcomes of 4 patients who had sustained eye injury during alexandrite laser-assisted hair removal.This was a retrospective case series of 4 patients who presented to 2 tertiary eye care hospitals over 2 years. Data on ophthalmic examination, spectral domain optical coherence tomography (Heidelberg Engineering, Heidelberg, Germany),...

article

Li3Gd3Te2O12:Eu3+- an intense red phosphor for solid state lighting applications

Hansnath Tiwari, S. Asiri Naidu, U.V. Varadaraju

Journal of Solid State Chemistry > 2017 > 246 > C > 319-323

Li₃Gd_3−3xEu_3xTe₂O₁₂ (x=0.05−1.0) phases with garnet structure were synthesized by high temperature solid state reaction and the photoluminescence properties were investigated. The appearance of bands due to intra 4f transitions of Gd³⁺ in the excitation spectra recorded by monitoring the 612nm emission line of the activator indicates Gd³⁺→Eu³⁺ energy transfer in this host lattice. Under 395nm excitation,...

article

Intense violet–blue emission and paramagnetism of nanocrystalline Gd³⁺ doped ZnO ceramics

S. Sambasivam, D. Paul Joseph, S. Asiri Naidu, K. N. Hui, more

Journal of Advanced Ceramics > 2015 > 4 > 4 > 300-306

Nanocrystalline Zn_1-xGd_xO (x = 0, 0.02, 0.04, 0.06, and 0.08) ceramics were synthesized by ball milling and subsequent solid-state reaction. The transmission electron microscopy (TEM) micrograph of as synthesized samples revealed the formation of crystallites with an average diameter of 60 nm, and the selected area electron diffraction (SAED) pattern confirmed the...

article

Influence of structural distortions upon photoluminescence properties of Eu3+ and Tb3+ activated Na3Ln(BO3)2 (Ln=Y, Gd) borates

S. Asiri Naidu, S. Boudin, U.V. Varadaraju, B. Raveau

Journal of Solid State Chemistry > 2012 > 190 > Complete > 186-190

The comparative study of the structure and photoluminescence (PL) properties of the Eu ³⁺ and Tb ³⁺ activated Na ₃ Ln(BO ₃ ) ₂ , with Ln=Y, Gd, showed the important role of the host lattice structure upon PL. Higher emission intensities of Eu ³⁺ and Tb ³⁺ are observed for Na ₃ Gd(BO ₃ ) ₂ than for Na ₃ Y(BO ...

article

Photoluminescence properties of rare earths (Eu3+, Tb3+, Dy3+ and Tm3+) activated NaInW2O8 wolframite host lattice

S. Asiri Naidu, S. Boudin, U.V. Varadaraju, B. Raveau

Journal of Solid State Chemistry > 2012 > 185 > Complete > 187-190

The photoluminescence (PL) studies on NaIn _1−x RE _x W ₂ O ₈ , with RE=Eu ³⁺ , Tb ³⁺ , Dy ³⁺ and Tm ³⁺ phases have shown that the relative contribution of the host lattice and of the intra-f–f emission of the activators to the PL varies with the nature of the rare earth cation. In the case of Dy ³⁺ and Tm ³⁺ activators,...

article

Host-sensitized emission of LiInW2O8 wolframites: From red-Eu3+ to white-Dy3+ phosphors

S. Asiri Naidu, S. Boudin, U.V. Varadaraju, B. Raveau

Journal of Solid State Chemistry > 2011 > 184 > 9 > 2566-2570

The LiInW ₂ O ₈ :Eu ³⁺ , LiInW ₂ O ₈ :Dy ³⁺ and LiInW ₂ O ₈ :Eu ³⁺ /Dy ³⁺ phosphors were synthesized by solid-state reaction and their photoluminescence properties were studied. Under UV excitation, the LiInW ₂ O ₈ :Eu ³⁺ phosphor exhibits an intense red emission whereas the LiInW ₂ O ...

article

Eu3+ luminescence in La5Si2BO13 with apatite related structure and magnetic studies in Ln5Si2BO13 (Ln=Gd, Dy)

S. Asiri Naidu, U.V. Varadaraju, B. Raveau

Journal of Solid State Chemistry > 2010 > 183 > 8 > 1847-1852

Eu ³⁺ photoluminescence is studied in La ₅ Si ₂ BO ₁₃ with apatite related structure. La _5−x Eu _x Si ₂ BO ₁₃ [x=0.05, 0.1, 0.3, 0.5, 0.7, 1.0, 2.0] compositions are synthesized. The emission results shows that Eu ³⁺ ions occupy two different cationic sites viz., La(1) and La(2). The increase in the intensity of ⁵ D ...

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Keywords

ENERGY TRANSFER (4)
HYPERFINE INTERACTIONS (4)
MAGNETIC PROPERTIES (4)
PHOTOLUMINESCENCE (4)
CATION DISTRIBUTION (3)
HARD FERRITES (2)
HEXAFERRITES (2)
MAGNETIZATION (2)
ANNEALING TEMPERATURE (1)
APATITE (1)
AUTO CITRIC SOL–GEL ROUTE (1)
BARIUM HEXAFERRITES (1)
BET ANALYSIS (1)
BIMETALLIC SUBSTITUTION (1)
CRITICAL CONCENTRATION (1)
EU3+ AS A STRUCTURE PROBE (1)
EUROPIUM AND TERBIUM DOPED BORATES (1)
GARNETS (1)
HEXAFERRITE (1)
HOST ABSORPTION (1)
HOST SENSITIZATION (1)
LIINW2O8 WOLFRAMITE (1)
MAGNETIC MATERIALS/PROPERTIES (1)
MAGNETIC NANOMATERIALS (1)
MAGNETIC NANOPARTICLES (1)
MAGNETO-OPTICAL PROPERTIES (1)
MORPHOLOGY (1)
MÖSSBAUER SPECTROSCOPY (1)
NAINW2O8 (1)
NANO-CERAMICS (1)
NIFE2O4 NANOPARTICLES (1)
OPTICAL ANALYSIS (1)
RARE EARTH (1)
RARE EARTH ELEMENT (1)
SEMICONDUCTORS (1)
SPINEL FERRITE (1)
SPINEL FERRITES (1)
STRONTIUM HEXAFERRITES (1)
TEM ANALYSIS (1)
X-RAY DIFFRACTION (1)
X-RAY DIFFRACTION (XRD) (1)
YTTRIUM AND GADOLINIUM BORATES PHOTOLUMINESCENCE (1)
ZNFE2O4 (1)
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Elsevier (9)
Springer (6)

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Search results for: S. Asiri

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