Geopolymers
Inorganic polymeric new materials
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Mircea Stefanescu
Mircea Stefanescu
“Politehnica” University Faculty of Industrial Chemistry and Environmental Engineering P-ta Victoriei no.2 300006 Timisoara Romania
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Marcela Stoia
Marcela Stoia
“Politehnica” University Faculty of Industrial Chemistry and Environmental Engineering P-ta Victoriei no.2 300006 Timisoara Romania
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Oana Stefanescu
Oana Stefanescu
“Politehnica” University Faculty of Industrial Chemistry and Environmental Engineering P-ta Victoriei no.2 300006 Timisoara Romania
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Paul Barvinschi
Paul Barvinschi
West University Faculty of Physics Bv. V. Parvan no. 4 300223 Timisoara Romania
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Abstract
This article presents a study on obtaining Ni, Zn ferrite starting from Fe(III), Ni (II), Zn (II) nitrates and some polyols: 1,2-propane diol, 1,3-propane diol and glycerol. While heating, a redox reaction takes place between nitrate anion and polyol, with formation of carboxylate type precursors. The obtained precursors have been investigated by thermal analysis, FT-IR spectrometry and atomic absorption spectroscopy. The thermal decomposition of the synthesized precursors up to 350 °C leads to the formation of Ni, Zn ferrite as unique phase, evidenced by XRD. The average diameter of the ferrite crystallites, estimated from XRD data, takes values within the range 20–50 nm, depending on the annealing temperature. Transmission Electron Microscopy has evidenced the obtaining of spherical, agglomerated nanoparticles. The magnetic properties of the synthesized samples, measured in cvasistatic magnetic field (50 Hz) are characteristic for the Ni, Zn ferrite nanoparticles, with narrow hysteresis cycle and values of the saturation magnetization <70 emu/g.
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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
| Volumes per Year |
1 |
| Issues per Year |
24 |
| Founder | Akadémiai Kiadó |
| Founder's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. |
| Publisher | Akadémiai Kiadó Springer Nature Switzerland AG |
| Publisher's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11. |
| Responsible Publisher |
Chief Executive Officer, Akadémiai Kiadó |
| ISSN | 1388-6150 (Print) |
| ISSN | 1588-2926 (Online) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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