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Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics

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2020
Authors
Obradović, Nina
Fahrenholtz, William G.
Filipović, Suzana
Marković, Smilja
Blagojević, Vladimir A.
Lević, Steva
Savić, Slobodan
Đorđević, Antonije
Pavlović, Vladimir B.
Article (Published version)
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Abstract
Solid-state mechanical activation of MgO and α-Al2O3 powders was used to produce MgAl2O4. The cation site occupancy in the resulting MgAl2O4 spinel was investigated using different methods. Differential thermal analysis and thermal gravimetry showed that mechanical activation reduced the spinel formation temperature by around 200 °C, and the corresponding activation energy by about 25%. In addition, characteristic temperatures for evaporation of physisorbed water and decomposition of Mg(OH)2 shifted to lower values, and peaks were more pronounced. Raman spectra were used to characterize the degree of inversion as a function of the sintering temperature for all of the sintered specimens, indicating that the breaking point for ordering of the crystal structure was around 1500 °C for non-activated samples, and 1400 °C for activated samples.
Source:
Journal of Thermal Analysis and Calorimetry, 2020, 140, 95-107
Publisher:
  • Springer
Projects:
  • Directed synthesis, structure and properties of multifunctional materials (RS-172057)
Note:
  • Peer-reviewed manuscript: http://dais.sanu.ac.rs/123456789/6910

DOI: 10.1007/s10973-019-08846-w

ISSN: 1588-2926

WoS: 000520712700006

Scopus: 2-s2.0-85074007393
[ Google Scholar ]
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URI
https://dais.sanu.ac.rs/123456789/10027
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  • ITN SANU - Opšta kolekcija / ITS SASA - General collection
Institution
Институт техничких наука САНУ / Institute of Technical Sciences SASA

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