scholarly journals Facile co-precipitation route for magnesium ferrites nanostructure: Synthesis, influence of pH variation on structural properties

2021 ◽  
Vol 53 (1) ◽  
pp. 67-78
Author(s):  
Devi Gole ◽  
S.B. Kapatkar ◽  
Shridhar Mathad ◽  
Rakesh Chavan
Keyword(s):  
Infrared Spectroscopy ◽  
Single Phase ◽  
X Ray Diffraction ◽  
Absorption Bands ◽  
Ph Variation ◽  
X Ray ◽  
Ferrite Sample ◽  
Octahedral Group ◽  
Co Precipitation ◽  
Influence Of Ph

This report presents the synthesis of magnesium ferrite (MgFe2O4) by coprecipitation method and its subsequent characterization by using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) techniques. XRD results confirm the formation of single phase cubic spinel structure, having lattice constant from 8.3216 ? to 8.3252 ?. An infrared spectroscopy study confirms the presence of two main absorption bands indicating tetrahedral and octahedral group complexes, within the spinel lattice. We also report hopping length (LA and LB), strain (?) and dislocation density (?D) of ferrite sample.

scholarly journals Synthesis and Structural Investigation of Nano-Sized Cadmium Ferrite

2016 ◽  
Vol 2 (1) ◽  
pp. 7-12 ◽  
Author(s):  
Rakesh M. Shedam ◽  
Ashok B. Gadkari ◽  
Shridhar N Mathad ◽  
Mahadev R. Shedam
Keyword(s):  
Infrared Spectroscopy ◽  
Structural Investigation ◽  
Spinel Phase ◽  
Lattice Parameter ◽  
X Ray Diffraction ◽  
Absorption Bands ◽  
X Ray ◽  
Ferrite Sample ◽  
Octahedral Group ◽  
Co Precipitation

This report presents the synthesis of cadmium ferrite (CdFe2O4) by Oxalate co-precipitation and its subsequent characterization by using X-ray diffraction (XRD) and Fourier transform Infrared spectroscopy (FTIR) techniques. XRD results confirm the single cubic spinel phase formation with lattice parameter 8.7561Ao. An infrared spectroscopy study shows the presence of main two absorption bands indicating the presence of tetrahedral and octahedral group complexes, respectively, within the spinel lattice. We also report strain, hopping length (LA and LB) and dislocation density  of ferrite sample.

Synthesis of Single-Phase Nanocrystalline YIG by Co-Precipitation: The Influence of pH Value of Precursor Solution and Calcinating

2011 ◽  
Vol 311-313 ◽  
pp. 1294-1299 ◽  
Author(s):  
Liang Zheng ◽  
Hui Zheng ◽  
Jiang Xia Deng ◽  
Zhi Hua Ying ◽  
Jun Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Grain Size ◽  
Single Phase ◽  
Ph Value ◽  
Precursor Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Precipitation ◽  
Influence Of Ph ◽  
Scanning Electron

Single-phase nanocrystalline YIG powders have been successfully synthesized through chemical co-precipitation methods. The influence of pH value of the precursor solution and calcinating conditions (temperatures ranging from 700 to 900°C and times ranging from 0.5 to 12 hours) on the purity and grain size of the single-phase nanocrystalline YIG powders were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) technique. The results show that a pure single-phase YIG powder was obtained as the pH value of precursor solution above 10 and the YIG grain grows bigger as calcinating temperature and time increased. Finally, the optimal condition to form single-phase nanocrystalline YIG with the smallest grain size is calcinating at 750°C for 7 hours.

Investigation of Ti Doping on the Structural, Optical and Magnetic Properties of ZnO Nanoparticles

2021 ◽  
Author(s):  
Raji P ◽  
K Balachandra Kumar
Keyword(s):  
Hexagonal Wurtzite Structure ◽  
Xrd Analysis ◽  
Infrared Analysis ◽  
Near Band Edge ◽  
Band Edge Emission ◽  
X Ray Diffraction ◽  
Absorption Bands ◽  
X Ray ◽  
Co Precipitation ◽  
Ti Doping

Abstract Ti - doped ZnO (TixZn1-xO x= 0.00, 0.05, 0.10, 0.15) nanoparticles have been synthesized through co - precipitation approach. X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence (PL), UV-Visible spectroscopy, and Vibrating Sample Magnetometer (VSM) have been used to characterize the samples. X-Ray Diffraction (XRD) analysis manifested the hexagonal wurtzite structure. The crystallite size decreased from 37 ​nm to 29 ​nm as dopant concentration is increased. Fourier transform infrared analysis showed the absorption bands of ZnO, with few within the intensities. SEM investigation showed the irregular shape and agglomeration of the particles. Ti, Zn, and O composition were determined from EDX analysis and confirmed the purity of the samples.PL spectra showed a near band edge emission and visible emission.Vibrating sample magnetometer (VSM) demonstrated pure and doped samples exhibited ferromagnetism behavior at room temperature.

scholarly journals Structural properties and magnetic interactions in Al3+ and Cr3+ co-substituted CoFe2O4 ferrite

2010 ◽  
Vol 8 (2) ◽  
pp. 419-425 ◽  
Author(s):  
Surendra More ◽  
Ram Kadam ◽  
Ankush Kadam ◽  
Dhanraj Mane ◽  
Govind Bichile
Keyword(s):  
Curie Temperature ◽  
Magnetic Interactions ◽  
X Ray Diffraction ◽  
Absorption Bands ◽  
X Ray ◽  
Cr Content ◽  
Phase Spinel ◽  
Cr Substitution ◽  
Xrd Patterns ◽  
Co Precipitation

AbstractA series of CoAlxCrxFe2−2xO4 systems (x = 0.1 to 0.5 in steps of x = 0.1) spinel ferrites have been synthesized successfully using wet chemical co-precipitation technique. The samples were characterized by X-ray diffraction (XRD), infrared spectroscopy (IR) and magnetization measurements. The powder XRD patterns confirm the single phase spinel structure for the materials synthesized. X -ray diffraction measurements were performed to yield the lattice constant as function of the amount x corresponding to Al-Cr substitution. Lattice parameters, X-ray density, bulk density and particle size decrease whereas porosity increases with the increase in Al-Cr content, ‘x’. Infrared studies show two absorption bands at about 400 cm−1 and 600 cm−1 for octahedral and tetrahedral sites, respectively. Saturation magnetization decreases with the increase in Al-Cr content x. AC magnetic susceptibility measurements were carried out as a function of temperature to measure the Curie temperature, which was found to decrease with Al-Cr content x. The decrease of Curie temperature has been explained by A-B interaction.

scholarly journals POTENTIALS OF INFRARED SPECTROSCOPY AND X-RAY STRUCTURAL ANALYSIS IN ASSESSING MINERAL COMPOSITION OF URINARY CONCREMENTS

2020 ◽  
Vol 20 (4) ◽  
pp. 136-140
Author(s):  
S.M. Kolupayev ◽  
E.P. Bereznyak
Keyword(s):  
Infrared Spectroscopy ◽  
Structural Analysis ◽  
Infrared Spectrum ◽  
Mineral Composition ◽  
Urinary Stones ◽  
X Ray Diffraction ◽  
Absorption Bands ◽  
X Ray ◽  
Extracorporeal Shock Wave ◽  
First Choice

This paper presents the results of the combined use of infrared spectroscopy and X-ray structural analysis in assessing the mineral composition of urinary concrement obtained during extracorporeal shock wave lithotripsy in 34 patients with urolithiasis. Registration of infrared spectra was carried out by an IKS-29 (LOMO) infrared spectrophotometer in the spectral range 4000 - 400 cm-1. X-ray structural analysis was carried out by X-ray diffraction using an X-ray diffractometer DRON-4-07. The mineral composition of 22 (64,70%) urinary stone samples according to infrared spectroscopy data, fully corresponded to the data of X-ray structural analysis. Vevellite, hydroxylapatite and uric acid were identified in most stones. In 4 (11,76%) cases, this method did not allow us to identify the phosphate component in the composition of the concrements accurately. Among the mineral components, which had the same characteristics in the infrared spectrum and corresponded to calcium phosphate, during the X-ray structural analysis, hydroxyapatite was identified in 3 (8,82%) cases, and struvite in 1 (2,94%) sample. 8 (23,52%) samples of urinary concrements had an amorphous-crystalline structure, which in the infrared spectrum was characterized by absorption bands corresponding to vevellite. When X-ray diffraction analysis of these samples was carried out, undifferentiated areas in the form of a halo were determined on the diffractogram that pointed out the presence of an amorphous phase. The data obtained demonstrate the potential of using infrared spectroscopy as the first choice method in assessing the mineral composition of urinary stones. X-ray structural analysis can be recommended as a clarifying technique in order to identify the phosphate component of stones of a crystal structure, as well as in the case of detecting rare, atypical minerals.

scholarly journals Resistivity Enhancement of Sr-Hexaferrite Using Rare Earth Dopant to Minimize Energy Losses

2018 ◽  
Vol 778 ◽  
pp. 195-199 ◽  
Author(s):  
Nahall Niazi ◽  
Omer Farooq ◽  
Fatima Tuz Zahra ◽  
Muhammad Anis-ur-Rehman
Keyword(s):  
Room Temperature ◽  
Single Phase ◽  
Hexagonal Structure ◽  
Precipitation Method ◽  
Strontium Hexaferrite ◽  
Energy Losses ◽  
X Ray Diffraction ◽  
High Frequencies ◽  
X Ray ◽  
Co Precipitation

Strontium hexaferrite is a material of choice due its various magnetic applications. Energy losses are a prominent issue in these magnetic materials. To lower these energy losses, we need to improve the resistivity by reducing eddy current losses. In this work nanoparticles of Gadolinium (Gd) doped Sr-hexaferrite (SrFe12-xGdxO19 x =0 .0, 0.1) have been synthesized by co-precipitation method. Structural analysis was done by using X-ray diffraction technique (XRD). It was found that the formation of single phase i.e. hexagonal structure has been achieved when the samples were sintered at 920°C for 20 minutes. AC electrical properties such as conductivity (𝜎ac), dielectric constant (ε′), dielectric loss (tanδ) and impedance (Z); real (Z') and imaginary (Z") parts have been studied as a function of frequency at room temperature. Aim of the work was to enhance the resistivity and was successfully achieved. Gd doped sample is proposed as an energy efficient material to be used in devices working at high frequencies.

Synthesis of LiFePO4 Cathode Materials by a Chemical Method

2011 ◽  
Vol 675-677 ◽  
pp. 57-60
Author(s):  
Yuan Sun ◽  
Xiu Juan Zhao ◽  
Rui Ming Ren
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Chemical Method ◽  
Single Phase ◽  
Raw Materials ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Co Precipitation ◽  
Scanning Electron

The olivine-type LiFePO4 powder was prepared by a chemical method using the synthesized FePO4⋅2H2O, LiOH and glucose as raw materials. The synthesized FePO4⋅2H2O powder was obtained by co-precipitation method. FePO4⋅2H2O and LiFePO4 powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed the synthesized FePO4⋅2H2O powder at pH of 2.05 was in a single phase and nearly spherical in shape. Using the synthesized powders to prepared LiFePO4 at 600 °C in vacuum for 2 h was nearly spherical in shape and whose size was in the range of 0.1-0.5μm.

STRUCTURE, MORPHOLOGICAL, MAGNETIC AND OPTICAL PROPERTIES OF CuxMg1-xFe2O4 (x = 0, 0.5, 1) NANO FERRITES SYNTHESIZED BY CO-PRECIPITATION METHOD

2021 ◽  
pp. 46-54
Author(s):  
Chinh
Keyword(s):  
Saturation Magnetization ◽  
Spinel Structure ◽  
Single Phase ◽  
Secondary Phase ◽  
Ferromagnetic Material ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xrd Patterns ◽  
Co Precipitation

CuxMg1.xFe2O4 nanoparticles were successfully synthesized by co-precipitation. The samples were calcined at 900 oC for 3 h and X-ray diffraction analysis showed that Cu0.5Mg0.5Fe2O4 had a single phase cubic spinel structure, while formation of secondary phase of Fe2O3 was observed in XRD patterns of CuFe2O4, MgFe2O4. The saturation magnetization (Ms) of Cu0.5Mg0.5Fe2O4 is in between the saturation magnetization values of CuFe2O4 and MgFe2O4 nanoparticles, CuFe2O4 is a ferromagnetic material, while MgFe2O4 and Cu0.5Mg0.5Fe2O4 show superparamagnetic behavior. The synthesized spinel ferrites were fully characterized using scanning electron microscopy (SEM), FTIR spectroscopy, energy dispersive spectroscopy (EDS) and UV-vis spectrophotometry.

Preparation and Characteristics of FePO4·xH2O Powder

2011 ◽  
Vol 675-677 ◽  
pp. 77-80 ◽  
Author(s):  
Hai Li Jing ◽  
Guo Jun Li ◽  
Rui Ming Ren
Keyword(s):  
Electron Microscopy ◽  
Single Phase ◽  
Xrd Analysis ◽  
Preparation Process ◽  
Test Results ◽  
X Ray Diffraction ◽  
Crystal Water ◽  
X Ray ◽  
Co Precipitation ◽  
Scanning Electron

Nano-sized precursor FePO4·xH2O particles were obtained by oxidation co-precipitation using FeSO4⋅7H2O, H2O2 and ammonia. The powder was characterized by differential thermal analysis (DTA) and thermogravimetry (TG), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The TG-DTA results determined the content of crystal water of FePO4·xH2O, i.e. x = 1.5. The SEM observation suggested that FePO4·xH2O particles were spherical in shape and its grain size was about 150 nanometers. The dispersion of the synthesized powder was improved through the addition of surfactant. The XRD analysis indicated that the synthesized FePO4·xH2O was amorphous. After being calcined at 720 °C for 10 hrs, the synthesized FePO4·xH2O at pH of ~3.5 was crystallized and FePO4 in a single phase was obtained. According to the test results, the optimized preparation process parameters were determined.

Raman And Fluorescence Spectra Observed in Laser Microprobe Measurements of Several Compositions in the Ln-Ba-Cu-O System

1990 ◽  
Vol 48 (2) ◽  
pp. 278-279
Author(s):  
Edgar S. Etz ◽  
Thomas D. Schroeder ◽  
Winnie Wong-Ng
Keyword(s):  
Fluorescence Spectra ◽  
Single Phase ◽  
X Ray Diffraction ◽  
Ceramic Powders ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Raman Microprobe ◽  
Methods Of Synthesis ◽  
Compositional Homogeneity ◽  
Processing Techniques

We are investigating by Raman microprobe measurements the superconducting and related phases in the LnBa2Cu3O7-x (for x=0 to 1) system where yttrium has been replaced by several of the lanthanide (Ln = Nd,Sm,Eu,Ho,Er) elements. The aim is to relate the observed optical spectra (Raman and fluorescence) to the compositional and structural properties of these solids as part of comprehensive materials characterization. The results are correlated with the methods of synthesis, the processing techniques of these materials, and their superconducting properties. Of relevance is the substitutional chemistry of these isostructural systems, the differences in the spectra, and their microanalytical usefulness for the detection of impurity phases, and the assessment of compositional homogeneity. The Raman spectra of most of these compounds are well understood from accounts in the literature.The materials examined here are mostly ceramic powders prepared by conventional solid state reaction techniques. The bulk samples are of nominally single-phase composition as determined by x-ray diffraction.

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