X-Ray Peak Broadening and Raman Spectroscopy Studies of Ce0.08Fe0.02O2-δ Nanoparticles Prepared by a Sol-Gel-Based Method

2016 ◽  
Vol 881 ◽  
pp. 491-496
Author(s):  
Nilson Santos Ferreira ◽  
A.C.B. de Oliveira ◽  
G.V.S. Mota ◽  
A.C. Cunha ◽  
Marcelo S. Silva
Keyword(s):  
Raman Spectroscopy ◽  
Single Phase ◽  
Sol Gel ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
Calcination Time ◽  
Xrd Pattern ◽  
X Ray ◽  
Peak Broadening ◽  
Spectroscopy Studies

Fe-doped (Ce0.98Fe0.02O2−δ) cerium oxide nanoparticles were synthesized by a sol-gel-based method at 1000 °C during different calcination time (1.0, 1.5, 2.0, and 2.5h). The effect of calcination time on microstructure and structural properties of the Ce0.98Fe0.02O2−δ nanoparticles was studied by X-ray diffraction (XRD) and Raman spectroscopy measurements. Analysis of the XRD pattern shows that all samples exhibited a single-phase fluorite structurewith lattice parameters ranging from 0.540991 Å (1.0h) to0.540635 Å (2.5h). Raman spectroscopy also confirms that the Fe atoms successfully displaced some of the Ce atoms in the CeO2 lattice without forming any impure phases. XRD and Raman spectroscopy results showed that both crystallite size and the particle size increased as the calcination time increased from around 36 nm (1.0h) to 64 nm (2.5h).

Nanosize Effects on Magnetic Properties and Peak Shifting of X-Ray Diffraction Pattern of BaFe12O19 Produced by Sol Gel Method

2013 ◽  
Vol 789 ◽  
pp. 87-92 ◽  
Author(s):  
Dwita Suastiyanti ◽  
Bambang Soegijono ◽  
M. Hikam
Keyword(s):  
Magnetic Properties ◽  
Diffraction Pattern ◽  
Single Phase ◽  
Sol Gel ◽  
Peak Position ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method

The formation of barium hexaferrite, BaFe12O19 single phase with nanosize crystalline is very important to get the best performance especially magnetic properties. The samples were prepared by sol gel method in citric acid-metal nitrates system. Hence the mole ratios of Ba2+/Fe3+ were varied at 1:12 and 1:11.5 with pH of 7 in all cases using ammonia solution. The solution was then heated at 80-90°C for 3 to 4 hours. Then it was kept on a pre-heated oven at 150°C. The samples were then heat treated at 450°C for 24 hours. Sintering process was done at 850°C and 1000°C for 10 hours.Crystallite size was calculated by X-Ray Diffraction (XRD) peaks using scherrer formula. To confirm the formation of a single phase, XRD analyses were done by comparing the sample patterns with standard pattern. The peak shifting of pattern could be seen from XRD pattern using rocking curves at extreme certain 2θ. It was used MPS Magnet Physik EP3 Permagraph L to know magnetic characteristics. This method can produce BaFe12O19 nanosize powder, 22-34 nm for crystallite size and 55.59-78.58 nm for particle size. A little diference in nanosize affects the peak shifting of XRD pattern significantly but shows a little difference in magnetic properties especially for samples at 850°C and 1000°C with mole ratio of 1:12 respectively. The well crystalline powder is formed at mole ratio of 1:11.5 at 850°C since it has the finest particle (55.59 nm) and crystalline (21 nm), the highest remanent magnetization (0.161 T) and the lowest intrinsic coersive (275.8 kA/m). It is also fitting exactly to the standard diffraction pattern with the highest value of best Figure of Merit (FoM), 90%. XRD peak position of this sample is almost same with XRD peak position of another sample with sinter temperature 1000°C at same mole ratio.

scholarly journals Improvement of the optical and photocatalytic properties of ZnAl2O4: 1% La3+, x% Pb2+ nanoparticles synthesized by citrate sol-gel route

2021 ◽  
Author(s):  
Hichem Filali ◽  
Nahman Boukheit ◽  
Rafika Bouhroum ◽  
Wassila Chekirou ◽  
Ahcène Karaali
Keyword(s):  
Raman Spectroscopy ◽  
Single Phase ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Constant Amount ◽  
Pure Zinc ◽  
Characterization Methods ◽  
X Ray ◽  
Gel Technique

Abstract Samples of pure zinc aluminate (ZnAl2O4) and doped both with lead (Pb2+) at different ratios (0, 0.5, 1, 1.5, 2 and 2.5% mol) and a constant amount of lanthanum (La: 1% mol), were prepared by the citrate sol-gel technique, and then annealed at 900°C for 2h. In order to study the structural, optical and thermal properties; different characterization methods were used, such as: powder X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), differential scanning calorimetry (DSC), TGA, Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. The Analyzes by XRD revealed the presence of the cubic single phase ZnAl2O4 for all samples, with a crystallites size between 19 and 25 nm. These results were confirmed using FTIR, Raman spectroscopy and SEM. Also, photocatalytic study for different samples of ZnAl2O4 shows that they can be used like as photocatalyst and good adsorbents for degradation of Hexamethyl crystallized violet dye in aqueous solution.

STRUCTURAL AND MAGNETIC PROPERTIES OF La0.67Sr0.33Mn0.93Zn0.07O3 MANGANITE

2013 ◽  
Vol 22 ◽  
pp. 203-206
Author(s):  
HILAL AHMED ◽  
SHAKEEL KHAN ◽  
WASI KHAN ◽  
RAZIA NONGJAI ◽  
IMRAN KHAN
Keyword(s):  
Single Phase ◽  
Magnetic Measurements ◽  
Sol Gel ◽  
Polycrystalline Sample ◽  
X Ray Diffraction ◽  
Orthorhombic Crystal ◽  
Xrd Pattern ◽  
X Ray ◽  
Field Dependent ◽  
Symmetry Field

The structural and magnetic measurements have been carried out on La 0.67 Sr 0.33 Mn 0.93 Zn 0.07 O 3 (LSMZO) polycrystalline sample. The sample has been prepared through Sol-Gel route. X-ray diffraction (XRD) pattern confirms the single phase nature of the sample with orthorhombic crystal symmetry. Field dependent magnetization shows the hysteresis loop with very low coercive field and the magnetization does not saturate up to the field of 5000 gauss in magnitude.

Structural and Optical Properties of Ti1-x Fex O2 Nanoparticles

2013 ◽  
Vol 432 ◽  
pp. 16-19
Author(s):  
Lila A. Alkhtaby
Keyword(s):  
Raman Spectroscopy ◽  
Single Phase ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Anatase Structure ◽  
X Ray ◽  
Diffraction Patterns ◽  
Group D ◽  
Fe Ions

We have synthesized the Ti1-x Fex O2 (x=0.01, 0.02, 0.03 and 0.05) nanoparticles by the sol gel method to enhance the photocatalyic property of TiO2 .These samples are characterized using x-ray diffraction (XRD), Raman spectroscopy, Ultraviolet /Visible (UV/V) spectroscopy and fluorescence spectroscopy (PL). The x-ray diffraction patterns show that all the sample are formed in single phase with a complete solubility of Fe ions in the TiO2 matrix. TiO2 nanoparticles are tetragonal with anatase structure belong to the space group D41h 9 (141 ) /amd Raman active modes appear at 150, 196, 396, 483, 516 and 637cm-1. UV/V spectra show a decrease in the band gap with the increase in Fe concentration from 3.26 eV (1% Fe concentration) to3.11 eV (5% Fe concentration).

scholarly journals EFFECTS OF Co DOPING ON PROPERTIES OF ILMENITE NiTiO3 CERAMICS

2018 ◽  
Vol 56 (1A) ◽  
pp. 119 ◽  
Author(s):  
Tran Tat Dat
Keyword(s):  
Raman Spectroscopy ◽  
Single Phase ◽  
Sol Gel ◽  
Nanocrystalline Powders ◽  
Rhombohedral Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Doping ◽  
Optical And Magnetic Properties ◽  
Co Doped

Pure and Co-doped NiTiO3 nanocrystalline powders were prepared by the sol-gel method. The effect of Co2+ doping on structural, optical and magnetic properties of NiTiO3 was investigated by X-ray diffraction, UV-vis absorption, Raman spectroscopy and vibration samples magnetometer. It was found that all fabricated samples were in single phase with rhombohedral structure. The presence of Co modifies the optical properties of the NiTiO3 nanocrystalline powders. Co doping in NiTiO3 resulted in decreasing of optical bandgap from 2.34 to 1.91 eV. The undoped and Co-doped samples

Impedance Spectroscopy Study of LiTaO3 Powder Synthesized via Sol-Gel Method

2012 ◽  
Vol 545 ◽  
pp. 275-278 ◽  
Author(s):  
Lili Widarti Zainuddin ◽  
Norlida Kamarulzaman
Keyword(s):  
Room Temperature ◽  
Single Phase ◽  
Sol Gel ◽  
Rhombohedral Structure ◽  
Spectroscopy Study ◽  
X Ray Diffraction ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Impedance Spectroscopy Study

A ceramics sample of LiTaO3 was prepared using a sol-gel method. The sample is annealed at 750 °C for 48 hours. X-ray diffraction analysis indicate the formation of single phase, rhombohedral structure. An ac impedance study was used to analyse the conductivity of LiTaO3 at room temperature and at various temperatures.

Study on optical and magnetic properties of FexNi1-xMn2O4 materials

2021 ◽  
Vol 66 (1) ◽  
pp. 57-64
Author(s):  
Hang Pham Vu Bich ◽  
Yen Nguyen Hai ◽  
Mai Phung Thi Thanh ◽  
Dung Dang Duc ◽  
Hung Nguyen Manh ◽  
...  
Keyword(s):  
Single Phase ◽  
Sol Gel ◽  
Vibrating Sample Magnetometer ◽  
Raman Scattering Spectrum ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scattering Spectrum ◽  
Diffraction Diagram ◽  
Optical And Magnetic Properties ◽  
Scanning Electron

In this study, we present the process of synthesis FexNi1-xMn2O4 (x = 0; 0.1; 0.3; 0.5; 0.7; 0.9; 1) by method sol-gel. Scanning electron microscope results shows that the particle size is about 50 nm. The X-ray diffraction diagram shows that the samples are single phase, changing structure clearly as the x ratio increases from 0 to 1. The lattice constant, the bond length also changes with x-value as shown on the Raman scattering spectrum. The results of the vibrating sample magnetometer show that the magnetism of the material FexNi1-xMn2O4 changes with the value of x and reaches a maximum in the range x from 0.5 to 0.7.

scholarly journals Термодинамические свойства оксипентафторида ванадия (IV), (NH-=SUB=-4-=/SUB=-)-=SUB=-3-=/SUB=-VOF-=SUB=-5-=/SUB=-

2020 ◽  
Vol 62 (7) ◽  
pp. 1123
Author(s):  
Е.В. Богданов ◽  
Е.И. Погорельцев ◽  
А.В. Карташев ◽  
М.В. Горев ◽  
М.С. Молокеев ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Photoelectron Spectroscopy ◽  
Single Phase ◽  
Dielectric Studies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Limits Of Stability ◽  
Three Phase ◽  
Temperature Dependences ◽  
Spectroscopy Studies

Abstract The (NH_4)_3VOF_5 crystals have been synthesized and their homogeneity and single-phase structure has been established by the X-ray diffraction, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy studies. The investigations of the temperature dependences of specific heat, entropy, strain, and pressure susceptibility show the occurrence of three phase transitions caused by the structural transformations in the (NH_4)_3VOF_5 crystals. The T – p phase diagram shows the temperature limits of stability of the crystalline phases implemented in (NH_4)_3VOF_5. The optical and dielectric studies disclose the ferroelastic nature of the phase transitions. An analysis of the experimental data together with the data on the isostructural (NH_4)_3VO_2F_4 crystal makes it possible to distinguish the physical properties of oxyfluorides containing vanadium of different valences (IV and V).

ChemInform Abstract: On the Symmetry of Ba3Al2O6- X-Ray Diffraction and Raman Spectroscopy Studies.

ChemInform ◽  
2009 ◽  
Vol 40 (14) ◽  
Author(s):  
B. Lazic ◽  
V. Kahlenberg ◽  
R. Kaindl ◽  
A. Kremenovic
Keyword(s):  
Raman Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spectroscopy Studies
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