scholarly journals Rietveld refinement, morphology and optical properties of (Ba1−xSrx)MoO4crystals

2013 ◽  
Vol 46 (5) ◽  
pp. 1434-1446 ◽  
Author(s):  
I. C. Nogueira ◽  
L. S. Cavalcante ◽  
P. F. S. Pereira ◽  
M. M. de Jesus ◽  
J. M. Rivas Mercury ◽  
...  
Keyword(s):  
Optical Properties ◽  
Fourier Transform ◽  
Rietveld Refinement ◽  
Structural Refinement ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Ft Ir ◽  
Xrd Patterns ◽  
Co Precipitation ◽  
Ft Raman

In this article, the structural refinement, morphology and optical properties of barium strontium molybdate [(Ba1−xSrx)MoO4withx= 0, 0.25, 0.50, 0.75 and 1] crystals, synthesized by the co-precipitation (drop-by-drop) method, are reported. The crystals obtained were structurally characterized by X-ray diffraction (XRD), Rietveld refinement, and Fourier transform–Raman (FT–Raman) and Fourier transform–infrared (FT–IR) spectroscopies. The shapes of the crystals were observed by means of field-emission scanning electron microscopy (FE-SEM). The optical properties were investigated using ultraviolet–visible (UV–Vis) absorption spectroscopy and photoluminescence (PL) measurements. XRD patterns, Rietveld refinement, and FT–Raman and FT–IR spectra showed that all of the crystals are monophasic with a scheelite-type tetragonal structure. The refined lattice parameters and atomic positions were employed to model the [BaO8], [SrO8] and [MoO4] clusters in the tetragonal lattices. The FE-SEM images indicate that increasedxcontent produces a decrease in the crystal size and modifications in the crystal shape. UV–Vis spectra indicated a decrease in the optical band gap with an increase inxin the (Ba1−xSrx)MoO4crystals. Finally, a decrease in the intensity of PL emission is apparent with an increase inxup to 0.75 in the (Ba1−xSrx)MoO4crystal lattice when excited by a wavelength of 350 nm, probably associated with the degree of structural order–disorder.

An Investigation on Structural and Optical Properties of Nanocrystalline Bismuth Ferrite and Manganese Sillenite Powders

2020 ◽  
Vol 835 ◽  
pp. 317-323
Author(s):  
D.A. Rayan ◽  
E.A. Abdel-Mawla ◽  
S.K. Mohamed ◽  
A.A. Mohamed ◽  
Mohamed M. Rashad
Keyword(s):  
Optical Properties ◽  
Bismuth Ferrite ◽  
Ammonium Hydroxide ◽  
Band Gap Energy ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Munk Function ◽  
Ft Ir ◽  
Uv Visible ◽  
Co Precipitation

Nanocrystalline bismuth ferrite BFO; BiFeO3 and manganese sillenite, BMO; Bi12MnO20 (BMO) powders have been successfully elaborated using a facile co-precipitation approach. The formed materials were examined using X-ray diffraction analysis (XRD), field emission scanning electron microscopy (FE-SEM). Furthermore, the change in the optical properties was performed based on Fourier transform infrared spectroscopy (FT-IR) and UV-visible spectrophotometer. Typical, pure BiFeO3 and Bi12MnO20 phases were detected for the precursors precipitated at pH 10 based on ammonium hydroxide as a base then annealed at 500°C for 2h. Eventually, the optical band gap energy of BFO and BMO using Kubelka–Munk function based on Tauc’s plot was found to be 2.12 and 2.79 eV, respectively.

Synthesis and Optical Properties of Eu3+ Doped NaYF4 and KYF4 Micro/Nanocrystals

2016 ◽  
Vol 16 (4) ◽  
pp. 3857-3860 ◽  
Author(s):  
Siling Guo ◽  
Chunyan Cao ◽  
Renping Cao
Keyword(s):  
Optical Properties ◽  
Emission Spectra ◽  
Local Environment ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Two Samples ◽  
Xrd Patterns ◽  
The Eu

Through a hydrothermal method, 1 mol% Eu3+ doped NaYF4 and KYF4 micro/nanocrystals have been synthesized. The materials were characterized by X-ray diffraction (XRD) patterns, field emission scanning electron microscopy (FE-SEM) images, room temperature photoluminescence (PL) excitation and emission spectra, and luminescent dynamic decay curves. The XRD analysis suggested the crystalline structures of the obtained samples. The FE-SEM images indicated the morphology and size of the obtained samples. The PL spectra illustrate the optical properties of Eu3+ in the two samples. Since it is sensitive to the local environment of the ion, the Eu3+ presents different optical properties in the NaYF4 and KYF4 materials.

Structural and Photocatalytic Properties of Fe-Dope TiO2 Nanostructure Using the Hydrothermal Treatment Method

2013 ◽  
Vol 634-638 ◽  
pp. 2261-2263
Author(s):  
Khun Ngern Supunnee ◽  
Vatcharinkorn Mekla ◽  
Eakkarach Raksasri
Keyword(s):  
Optical Properties ◽  
Hydrothermal Treatment ◽  
Treatment Method ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Cuo Nanostructure ◽  
Uv Visible ◽  
Xrd Patterns ◽  
Top View

In this work optical properties of CuO nanostructure were studied. CuO nanostructure were synthesized by the hydrothermal treatment method. The structural and chemical natures of the obtained materials were studied using powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and study optical properties by UV-visible spectral. The XRD patterns of the CuO nanostructures indicated that CuO phases (JCPDS 05- 0661). The top-view SEM images, it can be seen clearly that high-density, horizontally scattered nanorod were grown on the product prepared at concentration of NaOH (aq) 7.5 M at 180 C for 12 h. The spectral of UV-vis data recorded showed the strong cut off at 341 nm.

Adsorptive CuO/CuAl2O4 Nanoparticles for the Separation of Aqueous Methyl Orange

2016 ◽  
Vol 12 ◽  
pp. 21-32
Author(s):  
Samvit G. Menon ◽  
K.S. Choudhari ◽  
Suresh D. Kulkarni ◽  
C. Santhosh
Keyword(s):  
Methyl Orange ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
Simple Method ◽  
X Ray ◽  
Quantitative Separation ◽  
Ft Ir ◽  
Xrd Patterns ◽  
Co Precipitation ◽  
Ir Spectroscopic

A simple method for the separation of aqueous methyl orange, an azo dye, is reported, where CuO/CuAl2O4 nanoparticles synthesisedby co-precipitation methodwere used as the adsorbent. The presence of cubic CuAl2O4 (CAO) and monoclinic CuO phase of this composite material was confirmed by X-Ray diffraction and its specific surface area wasdetermined by BET nitrogen adsorption method.To study the nature of surface charge, theisoelectric point of the material was determined using the pH drift methodfollowing which the rate of decolouration was studied forpH 5and pH 7. Theexperiments in the absence oflight show that adsorption of the dye is prevalent even up to 6h leading to 86% decolouration.A methanolic extraction was effectivefor quantitative separation ofadsorbed dye fromCuO/CuAl2O4 nanoparticles regenerating them for reuse. The presence of methyl orange in the extracted solution and on the nanoparticles at various stages was verified byUV-Visible and FT-IR spectroscopic methods.The extent of adsorption was quantified and found tobe as high as 86%. The catalyst aftercomplete extraction ofmethyl orange (MO),could be reused for the decolouration. Stability of the nanoparticles after reuse was verified by the closematch of XRD patterns ofthe pure and reused CAOwhich show no significant changes in itscrystal structure. The separation method shown here can be extended for the removal of other azo dyesfrom textile effluents.

Structural and Photocatalytic Properties of CuO Nanorods Using the Hydrothermal Treatment Method

2013 ◽  
Vol 634-638 ◽  
pp. 2258-2260
Author(s):  
Sopa Noontasa ◽  
Vatcharinkorn Mekla ◽  
Sert Kiennork
Keyword(s):  
Optical Properties ◽  
Hydrothermal Treatment ◽  
Treatment Method ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Cuo Nanostructure ◽  
Uv Visible ◽  
Xrd Patterns ◽  
Top View

In this work optical properties of CuO nanostructure were studied. CuO nanostructure were synthesized by the hydrothermal treatment method. The structural and chemical natures of the obtained materials were studied using powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and study optical properties by UV-visible spectral. The XRD patterns of the CuO nanostructures indicated that CuO phases (JCPDS 05- 0661). The top-view SEM images, it can be seen clearly that high-density, horizontally scattered nanorod were grown on the product prepared at concentration of NaOH (aq) 7.5 M at 180 C for 12 h. The spectral of UV-vis data recorded showed the strong cut off at 341 nm.

Microstructure Characterization of Metal Mixed Oxides

MRS Advances ◽  
2017 ◽  
Vol 2 (64) ◽  
pp. 4025-4030 ◽  
Author(s):  
T. Kryshtab ◽  
H. A. Calderon ◽  
A. Kryvko
Keyword(s):  
Mixed Oxides ◽  
Profile Analysis ◽  
Atomic Resolution ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Reconstruction Procedure ◽  
Transmission Electron ◽  
Xrd Patterns ◽  
Co Precipitation

ABSTRACTThe microstructure of Ni-Mg-Al mixed oxides obtained by thermal decomposition of hydrotalcite-like compounds synthesized by a co-precipitation method has been studied by using X-ray diffraction (XRD) and atomic resolution transmission electron microscopy (TEM). XRD patterns revealed the formation of NixMg1-xO (x=0÷1), α-Al2O3 and traces of MgAl2O4 and NiAl2O4 phases. The peaks profile analysis indicated a small grain size, microdeformations and partial overlapping of peaks due to phases with different, but similar interplanar spacings. The microdeformations point out the presence of dislocations and the peaks shift associated with the presence of excess vacancies. The use of atomic resolution TEM made it possible to identify the phases, directly observe dislocations and demonstrate the vacancies excess. Atomic resolution TEM is achieved by applying an Exit Wave Reconstruction procedure with 40 low dose images taken at different defocus. The current results suggest that vacancies of metals are predominant in MgO (NiO) crystals and that vacancies of Oxygen are predominant in Al2O3 crystals.

Synthesis, Characterization and Properties of PANI/(La-Nd Doped BaFe12O19) Composites

2017 ◽  
Vol 727 ◽  
pp. 327-334
Author(s):  
Yan Wang ◽  
Jun Wang ◽  
Xiao Fei Zhang ◽  
Ya Qing Liu
Keyword(s):  
Sol Gel ◽  
Network Analyzer ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Structure Morphology ◽  
Xrd Patterns ◽  
Hexagonal Platelet ◽  
Peak Value ◽  
Properties Of Composites

La-Nd co-doped barium hexaferrites, Ba0.7(LamNdn)0.3Fe12O19 (D-BaM), were successfully prepared by sol-gel method. PANI / D-BaM composites were synthesized by in-situ polymerization in solution. The structure, morphology and properties of samples have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), four-probe conductivity tester and vector network analyzer. The XRD patterns showed that the crystal structure of all the samples exist as M-type phases. The SEM images revealed that the particles presented a hexagonal platelet-like morphology. The magnetic properties could be improved by substitutions of La and Nd ions. The saturation magnetization (Ms) and coercive force (Hc) increased with the change of La / Nd ratio to the maximum at La / Nd = 3:1. The doped particles have also been embedded in conductive PANI to prepare electromagnetic materials, and the conductivity kept on the order of 10-2. The microwave absorbing properties of composites at 30 MHz-6 GHz improved obviously, the peak value of reflection loss could reach-7.5 dB.

Synthesis of Silica Modified Large-Sized Hydroxyapatite Whiskers by a Hydrothermal Co-Precipitation Method

2015 ◽  
Vol 645-646 ◽  
pp. 1339-1344 ◽  
Author(s):  
Yan Ting Yin ◽  
Qing Hua Chen ◽  
Ting Ting Yan ◽  
Qing Hua Chen
Keyword(s):  
Bone Repair ◽  
Ethanol Solution ◽  
Morphological Properties ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
New Type ◽  
Ft Ir ◽  
Co Precipitation ◽  
Surface Modified

The objective of this study was to develop a novel silica modified large-sized hydroxyapatite whiskers with improved properties for use in bone repair applications. Large-sized whiskers with a mean length of 250μm were obtained by a hydrothermal co-precipitation method at 150°C, 7.5Mpa in high-pressure reactor. Silica modified hydroxyapatite whiskers were prepared by dissolving TEOS in ethanol solution, then sintering with hydroxyapatite. The compositional and morphological properties of prepared whiskers were studied by means of x-ray diffraction (XRD), Fouier transform infrared (FT-IR), scanning electron microscopy (SEM). The results indicated the evidence of nanosilicon dioxide particles on the surface of HAP whiskers. The size of nanosilicon dioxide particles depends on dropping and stirring rate. Hence, this new type of silica modified large-sized hydroxyapatite whiskers is a valuable candidate for biomedical applications.Key words: hydroxyapatite, hydrothermal co-precipitation, surface modified, whiskers

Synthesis, Characterization and Optical Properties of PLA / P3HT Blends Thin Films

2021 ◽  
Vol 19 (5) ◽  
pp. 132-138
Author(s):  
Maan Abd-Alameer Salih ◽  
Q.S. Kareem ◽  
Mohammed Hadi Shinen
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Spin Coating ◽  
Ring Opening ◽  
Energy Gap ◽  
Ring Opening Polymerization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Conductivity Increase ◽  
Ft Ir

In this exploration Poly lactic corrosive (PLA) was orchestrated the ring-opening polymerization Poly lactic corrosive (PLA) blended with poly(3-hexylthiophene) (P3HT) which prepared by solution. Blends thin films Synthesis by spin coating technique and using Tetrahydrofuran (THF) as solvent. PLA powder was 'characterized by' 'X-ray' 'diffraction', '(FT-IR)'. pure Optical properties (PLA), (PLA)/P3HT blends thin films with different percentage of P3HT (0, 1, 2, and 3) wt% were investigated using UV-VS spectroscopy The results showed that the absorption, absorption coefficient, extinction coefficient and conductivity increase with increasing the rate of deformation P3HT, The energy gap decreases with increasing deformation.

Sign in / Sign up

Export Citation Format

Share Document