scholarly journals Effect of Thermal Treatment at Inert Atmosphere on Structural and Magnetic Properties of Non-stoichiometric Zinc Ferrite Nanoparticles

2021 ◽  
Vol 52 (5) ◽  
pp. 1632-1648
Author(s):  
Angelika Kmita ◽  
Jan Żukrowski ◽  
Juliusz Kuciakowski ◽  
Marianna Marciszko-Wiąckowska ◽  
Antoni Żywczak ◽  
...  
Keyword(s):  
Zinc Ferrite ◽  
Iron Reduction ◽  
Inert Atmosphere ◽  
Temperature Treatment ◽  
Ferrite Nanoparticles ◽  
High Temperature Treatment ◽  
Magnetic Studies ◽  
Chemical Methods ◽  
Co Precipitation ◽  
Metalorganic Compounds

AbstractZinc ferrite nanoparticles were obtained by chemical methods (co-precipitation and thermal decomposition of metalorganic compounds) and systematically probed with volume (XRD, VSM), microscopic (TEM) and element sensitive probes (ICP-OES, Mössbauer Spectroscopy, XPS, XAFS). Magnetic studies proved the paramagnetic response of stoichiometric ZnFe2O4 (ZF) nanoparticles, while superparamagnetic behavior was observed in as-synthesized, non-stoichiometric ZnxFe3−xO (NZF) nanoparticles. Upon annealing up to 1400 °C in an inert atmosphere, a significant change in the saturation magnetization of NZF nanoparticles was observed, which rose from approximately 50 up to 140 emu/g. We attribute this effect to the redistribution of cations in the spinel lattice and reduction of Fe3+ to Fe2+ during high-temperature treatment. Iron reduction is observed in both ZF and NZF nanoparticles, and it is related to the decomposition of zinc ferrite and associated sublimation of zinc oxide.

Micro Raman, Mossbauer and magnetic studies of manganese substituted zinc ferrite nanoparticles: Role of Mn

2016 ◽  
Vol 91 ◽  
pp. 136-144 ◽  
Author(s):  
Suneetha Thota ◽  
Subhash C. Kashyap ◽  
Shiv K. Sharma ◽  
V.R. Reddy
Keyword(s):  
Zinc Ferrite ◽  
Ferrite Nanoparticles ◽  
Magnetic Studies

Synthesis of nickel-zinc ferrite nanoparticles in polyol: morphological, structural and magnetic studies

2006 ◽  
Vol 203 (3) ◽  
pp. 504-512 ◽  
Author(s):  
Z. Beji ◽  
T. Ben Chaabane ◽  
L. S. Smiri ◽  
S. Ammar ◽  
F. Fiévet ◽  
...  
Keyword(s):  
Zinc Ferrite ◽  
Ferrite Nanoparticles ◽  
Magnetic Studies ◽  
Nickel Zinc

Characterization of Zr-doped TiO2 prepared by homogenous co-precipitation without high-temperature treatment

2007 ◽  
Vol 42 (22) ◽  
pp. 9421-9428 ◽  
Author(s):  
Jozef Lukáč ◽  
Mariana Klementová ◽  
Petr Bezdička ◽  
Snejana Bakardjieva ◽  
Jan Šubrt ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
Doped Tio2 ◽  
Co Precipitation

Synthesis, Characterization and Photocatalytic Activities of Bismuth Vanadate by Facile Co-Precipitation Method

2010 ◽  
Vol 148-149 ◽  
pp. 1469-1472
Author(s):  
Chao Jun Liu ◽  
Yue Hua Xu
Keyword(s):  
Diffuse Reflectance Spectroscopy ◽  
Average Crystallite Size ◽  
Temperature Treatment ◽  
Precipitation Method ◽  
High Temperature Treatment ◽  
Synthesis Conditions ◽  
High Efficient ◽  
Photocatalytic Activities ◽  
Co Precipitation ◽  
Monoclinic Bivo4

Monoclinic BiVO4 photocatalysts were synthesized via facile and straightforward co-precipitation method at room temperature without high temperature treatment and characterized with X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), flourier transfer infrared spectroscopy (FT-IR), Brunauer-Emmett-Teller (BET), and transmission electron microscopy (TEM). The results indicate that through proper selection of synthesis conditions, it is possible to obtain high efficient BiVO4 nanoparticles. The as-prepared monoclinic BiVO4 photocatalysts have an average crystallite size of about 20 nm with the particle size of about 20 to 50 nm. Their photocatalytic activities were evaluated by decolorization of rhodamine B in aqueous solution under visible light irradiation, and the relationship between the photocatalytic activity of BiVO4 and their physicochemical properties were investigated.

scholarly journals KINETICS OF SOLID-STATE MULLITE SYNTHESIS FROM ACTIVATED PRECURSORS

2018 ◽  
Vol 59 (1) ◽  
pp. 36
Author(s):  
N.F. Kosenko ◽  
N.V. Filatova ◽  
Yu.V. Pimkov
Keyword(s):  
Solid State ◽  
Active Form ◽  
Effective Rate ◽  
Temperature Treatment ◽  
High Temperature Treatment ◽  
First Order ◽  
Co Precipitation ◽  
Kinetics Of ◽  
Product Accumulation ◽  
Energy Activation

The solid-state synthesis kinetics of the mullite 3Al2O3∙2SiO2 from aluminium hydroxide and metasilicic acid was studied. Hydrated oxides obtained in an active form as a result of a mechanical activation or co-precipitation (precursors) were subjected to a high-temperature treatment. The reaction rate was described by the kinetic first-order equation. Effective rate constants and energy activation were determined. The positive action of mullite seed crystals on the product accumulation was confirmed.

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