scholarly journals Effect of Calcination Temperature on Physical properties of Ni0.6Zn0.4Fe2O4  Ferrite nanoparticles

2021 ◽  
Author(s):  
sivakumar pendyala ◽  
G.k.Sivasankara Yadav
Keyword(s):  
Physical Properties ◽  
Crystallite Size ◽  
Calcination Temperature ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
Combustion Method ◽  
Ferrite Nanoparticles ◽  
Calcination Temperatures ◽  
Auto Combustion ◽  
Lcr Meter

Abstract The influence of Calcination temperature on the physical properties of Ni0.6Zn0.4Fe2O4 ferrite nanoparticles were investigated. These ferrite nanoparticles have been synthesized by sol-gel auto combustion method using citric acid as fuel agent at different calcination temperatures (4000C, 5000C and 6000C). The Morphological investigation, average crystallite size and microstructure of the material were examined by using X-ray diffraction (XRD) and confirmed by field emission scanning electron microscope (FESEM) and FTIR spectra. The Effects of calcination temperature on the dielectric and magnetic properties were calculated by using LCR meter and vibrating sample magnetometer (VSM). The XRD result shows a single-phase cubic spinel structure with average crystallite size increases from 27 to 29.5 nm, with an increase of temperature. The highest saturation magnetization was found at a calcination temperature 6000C with value 80.39 emu/g, and the value coercive field (Hc) was inverse with the crystallite size.

Effect of Annealing Temperature of CoCr2O4 on Structural and Vibrational Properties

2019 ◽  
Vol 11 (11) ◽  
pp. 1079-1081 ◽  
Author(s):  
Prachi Joshi ◽  
Pallavi Saxena ◽  
M. D. Varshney ◽  
V. N. Rai ◽  
A. Mishra
Keyword(s):  
Calcination Temperature ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
Combustion Method ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Auto Combustion ◽  
Different Temperatures ◽  
Disorder Effect ◽  
High Calcination Temperature

CoCr2O4 nanoparticles were prepared by low-temperature sol–gel auto combustion method. In this paper, we have investigated the structural behavior of CoCr2O4 nanoparticles annealed at two different temperatures (600 °C and 800 °C). From the X-ray diffraction (XRD) pattern of CoCr2O4, we have found that there is no change in crystalline structure and it was indexed in the cubic spinel structure with space group Fd3m. It was observed that average crystallite size increases with calcination temperature. High calcination temperature reduced the noise level and enhanced the accuracy of calculated parameters. For both the samples of CoCr2O4, we observed Raman scattering modes at around 471, 516, 539, 561, 590, 626 and 688 cm–1. The additional modes in vibrational spectra appear due to the disorder effect.

scholarly journals Synthesis and Characterization of Ce3+-Doped Ni0.5Cd0.5Fe2O4 Nanoparticles by Sol–Gel Auto-Combustion Method

Coatings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1156
Author(s):  
Danyal Ahmad ◽  
Nasir Mehboob ◽  
Abid Zaman ◽  
Nabeel Ahmed ◽  
Kashif Ahmed ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Crystallite Size ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
Combustion Method ◽  
Xrd Analysis ◽  
Sem Images ◽  
X Ray ◽  
Auto Combustion ◽  
Ray Density

Cerium (Ce)-doped Ni0.5Cd0.5CexFe2−xO4 (0.0 ≤ x ≤ 0.20) was synthesized using the sol–gel auto-combustion method. X-ray diffraction (XRD) analysis revealed that all the samples retained spinel cubic crystal structure with space group Fd3m at 800 °C. Crystal structure parameters, such as lattice constant, average crystallite size, and X-ray density were estimated from the major XRD (311) peak. Bulk density and porosity were also calculated. The average crystallite size was estimated to be in the range of 20–24 nm. SEM images displayed agglomerated particles with a porous morphology. The dielectric constant (ε′) increased and the dielectric loss tangent (tanδ) decreased with rising Ce concentration. The hysteresis loop (M–H loop) was measured at room temperature using a vibrating-sample magnetometer (VSM), which showed a nonlinear decrease in magnetization and coercivity with increasing Ce concentration.

scholarly journals Influence of trivalent rare earth (Dy3+) ions substitution on the structural, magnetic and dielectric properties of nanosized Ni0.6Cd0.4DyxFe2‒xO4 ferrites

2020 ◽  
Author(s):  
Hemant Kumar Dubey ◽  
Preeti Lahiri
Keyword(s):  
Dielectric Constant ◽  
Sol Gel ◽  
Average Crystallite Size ◽  
Combustion Method ◽  
Sem Images ◽  
Tem Analysis ◽  
Low Dielectric ◽  
Auto Combustion ◽  
Crystallite Sizes ◽  
High Dielectric

Abstract In the present work, Ni0.6Cd0.4DyxFe2‒xO4 (x = 0.0, 0.05, 0.10, 0.15 and 0.20) nanoparticles (NPs) were synthesized by using sol-gel auto combustion method. The structural characterization was performed by XRD, FTIR, SEM, TEM and EDS analyses. XRD patterns confirmed that the pure and dysprosium substituted Ni-Cd ferrites are in single phase spinel structures, while a trace of DyFeO3 appears as a minor phase for higher concentrations (x = 0.10, 0.15 and 0.20). The Debye‒Scherrer’s method and Williamson-Hall (W-H) method were used to evaluate the crystallite sizes and lattice strain. The average crystallite size was found to be in the range from 27 to 48 nm. FT-IR confirms the formation of spinel structure. SEM images show that reduction of grain size with Dy3+ content. Elemental composition features of samples were examined by EDS. The average particles size estimated from TEM analysis are in good agreement with results obtained from the XRD. The results showed that saturation magnetization (Ms) decreases and coercivity (Hc) increases with increase in Dy3+ concentrations. The dielectric constant and the loss tangent decrease rapidly with increasing frequency and then reaches a constant value, characteristic of normal behavior of ferrites. The dielectric constant was found to decrease with increasing Dy content in Ni-Cd ferrites. Ferrite sample with Dy3+ concentration, x = 0.05 show high dielectric constant, low dielectric loss and hence can be utilized in high frequency electrical circuits.

Synthesis and Characterization of Cobalt Ferrite Nanoparticles via Sol-Gel Auto Combustion Method

2020 ◽  
Vol 307 ◽  
pp. 58-63
Author(s):  
Che Zaheerah Najeehah ◽  
Kashif Tufail Chaudhary ◽  
Jalil Ali
Keyword(s):  
Crystallite Size ◽  
Spinel Structure ◽  
Cobalt Ferrite ◽  
Sol Gel ◽  
Combustion Method ◽  
Spectral Lines ◽  
Hysteresis Curve ◽  
X Ray ◽  
Tauc Plot ◽  
Auto Combustion

This article reports the synthesis of cobalt ferrite (CoFe2O4) nanoparticles by low-cost sol-gel auto combustion method. The synthesized CoFe2O4 nanoparticles were characterized using X-ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), Energy Dispersive X-ray (EDX), UV-Visible (UV-Vis), Fourier Transform Infrared Spectroscopy (FTIR) and Vibrating Sample Magnetometry (VSM). The XRD pattern inferred the formation of cubic spinel structure with average crystallite size 35.3 nm. The crystallite size was obtained in the range 32-37.5 nm in FESEM analysis. The elemental composition was confirmed using EDX spectroscopy. The presence of spectral lines at positions 465.57 cm-1 and 577.52 cm-1 associated to stretching vibrations of Co-O in octahedral sites and Fe-O in tetrahedral sites confirmed the spinel structure. The magnetic properties such as saturation magnetization (Ms) 67.79 emu/g, coercivity (Oe) 874.76 Oe and remnant (Mr) 29.07 emu/g were obtained from the hysteresis curve. The bandgap 1.409 eV was obtained for synthesized CoFe2O4 using Tauc plot from UV-Vis absorption spectra.

Synthesis and Characterization of Stabilized Tetragonal Nano Zirconia by Precipitation Method

2019 ◽  
Vol 56 ◽  
pp. 142-151
Author(s):  
Hassan Shokry ◽  
Marwa Elkady ◽  
Hesham Hamad
Keyword(s):  
Phase Transformation ◽  
Crystallite Size ◽  
Calcination Temperature ◽  
Average Crystallite Size ◽  
Precipitation Method ◽  
Synthesis And Characterization ◽  
Calcination Temperatures ◽  
Ft Ir ◽  
20 Nm

Nano sized ZrO2 nanopowder was synthesized by precipitation method. Phase transformation was investigated as a function of calcination temperature by XRD, SEM , and FT-IR. It is indicated that the thermal anneling from 400 to 800 °C resulted in increasing the average crystallite size from 12 to 20 nm. As the calcination temperature increased, the crystallite size and the agglomeration were increased. The increase in the monoclinic content and grain growth are caused by the calcination temperatures even calcination at 800 °C.

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