INFLUENCE OF pH ON PHYSICAL PROPERTIES OF NICKEL-ZINC NANOCRYSTALLINE POWDERS SYNTHESIZED BY A SOL-GEL AUTO-COMBUSTION METHOD

2008 ◽  
Vol 22 (18n19) ◽  
pp. 3153-3158 ◽  
Author(s):  
M. R. BARATI ◽  
S. A. SEYYED EBRAHIMI ◽  
A. BADIEI
Keyword(s):  
Crystallite Size ◽  
Zinc Ferrite ◽  
Ph Value ◽  
Sol Gel ◽  
Combustion Process ◽  
Nanocrystalline Powders ◽  
Nanocrystalline Powder ◽  
Nickel Zinc ◽  
Auto Combustion ◽  
Influence Of Ph

In this research a sol-gel auto-combustion route has been proposed to synthesize nickel-zinc ferrite nanocrystalline powder, using metal nitrates, citric acid as fuel and ammonia as pH adjusting agent. The influence of pH value of the solution on phase evolution, crystallite size and morphology of as-burnt powders were investigated by XRD, SEM and TEM techniques. The results revealed that with pH=7 the single phase nickel-zinc ferrite nanocrystalline powders with crystallite size of about 27nm were formed directly after auto combustion process.

Influence of Different Calcination Conditions on the Microstructure and Phase Constitution of Nickel-Zinc Ferrite Nanocrystalline Powders Prepared by a Sol-Gel Auto-Combustion Method

2008 ◽  
Vol 368-372 ◽  
pp. 598-600 ◽  
Author(s):  
M.R. Barati ◽  
S.A. Seyyed Ebrahimi ◽  
A. Badiei
Keyword(s):  
Zinc Ferrite ◽  
Sol Gel ◽  
Combustion Method ◽  
Nanocrystalline Powders ◽  
Nanocrystalline Powder ◽  
Phase Constitution ◽  
Nickel Zinc ◽  
Metal Nitrates ◽  
Auto Combustion

In this work, nickel-zinc ferrite nanocrystalline powder has been prepared by a sol-gel autocombustion technique using nitrate-citrate gel obtained from metal nitrates and citric acid solution. Characterization of the nitrate-citrate gel, as-burnt powder and calcined powder at different calcination conditions were investigated by using XRD, FTIR and SEM techniques. The results revealed that the nitrate-citrate gel exhibits a self-propagating behavior after ignition and showed that the different calcination conditions affect the crystallite size of the synthesized powder as well as its phase constitution.

Synthesis of nanocrystilline ferrites by sol–gel combustion process: the influence of pH value of solution

2004 ◽  
Vol 270 (1-2) ◽  
pp. 216-223 ◽  
Author(s):  
Zhenxing Yue ◽  
Wenyu Guo ◽  
Ji Zhou ◽  
Zhilun Gui ◽  
Longtu Li
Keyword(s):  
Ph Value ◽  
Sol Gel ◽  
Combustion Process ◽  
Gel Combustion ◽  
Influence Of Ph

Study of Sol-Gel Auto-Combustion Method Prepare Ni0.6-xZn0.4MgxFe2O4

2012 ◽  
Vol 463-464 ◽  
pp. 1052-1056
Author(s):  
Ai Xiang Zeng ◽  
Jun Yuan
Keyword(s):  
Crystal Structure ◽  
Zinc Ferrite ◽  
Single Phase ◽  
Sol Gel ◽  
Combustion Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nickel Zinc ◽  
Auto Combustion ◽  
Scanning Electron

Ni0.6-xZn0.4MgxFe2O4were synthesized by sol-gel auto-combustion method with Zn(NO3.) 2 •6H2O. , Ni(NO3.) )2•6H2O. , Mg(NO3.) )2•6H2O. , Fe(NO3.) )3•9H2O. , COOO2. and NH3•H2O. X-ray diffraction (XRD) analysises show that the sample is single phase and the doping of magnesium makes no difference to nickel-zinc ferrite’s crystal structure; nickel-zinc ferrite has formed after auto-combustion. Scanning electron microscope analysises show that after sintered the sample’s size is more even and the doping of magnesium makes the size smaller and more even too.

scholarly journals Magnetic and Mössbauer Spectroscopy Studies of Zinc-Substituted Cobalt Ferrites Prepared by the Sol-Gel Method

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1799 ◽  
Author(s):  
Qing Lin ◽  
Jianmei Xu ◽  
Fang Yang ◽  
Jinpei Lin ◽  
Hu Yang ◽  
...  
Keyword(s):  
Quantum Interference ◽  
Room Temperature ◽  
Ph Value ◽  
Sol Gel ◽  
Combustion Process ◽  
Zinc Content ◽  
Zinc Ion ◽  
Cubic Phase ◽  
Mössbauer Spectrometer ◽  
Auto Combustion

Zinc ion-substituted cobalt ferrite powders Co1−xZnxFe2O4 (x = 0–0.7) were prepared by the sol-gel auto-combustion process. The structural properties and magnetic of the samples were investigated with X-ray diffraction (XRD), superconducting quantum interference device, and a Mössbauer spectrometer. The results of XRD showed that the powder of a single cubic phase of ferrites calcined when kept at 800 °C for 3 h. The lattice constant increases with increase in Zn concentration, but average crystallite size does not decrease constantly by increasing the zinc content, which is related to pH value. It was confirmed that the transition from ferrimagnetic to superparamagnetic behaviour depends on increasing zinc concentration by Mössbauer spectra at room temperature. Magnetization at room temperature increases for x ≤ 0.3, but decreases for increasing Zn2+ ions. The magnetization of Co0.7Zn0.3Fe2O4 reached maximum value (83.51 emu/g). The coercivity decreased with Zn2+ ions, which were doped on account of the decrease of the anisotropy constant.

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