Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics

2020
Authors
Obradović, Nina
Fahrenholtz, William G.
Filipović, Suzana

Marković, Smilja

Blagojević, Vladimir A.

Lević, Steva

Savić, Slobodan
Djordjević, Antonije
Pavlović, Vladimir

Article (Published version)

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Solid-state mechanical activation of MgO and alpha-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 degrees 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 degrees C for non-activated samples, and 1400 degrees C for activated samples.
Keywords:
Mechanical activation / DTA / Raman spectroscopy / Sintering kinetics / SpinelSource:
Journal of Thermal Analysis and Calorimetry, 2020, 140, 1, 95-107Publisher:
- Springer, Dordrecht
Funding / projects:
DOI: 10.1007/s10973-019-08846-w
ISSN: 1388-6150
WoS: 000520712700006
Scopus: 2-s2.0-85074007393
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Poljoprivredni fakultetTY - JOUR AU - Obradović, Nina AU - Fahrenholtz, William G. AU - Filipović, Suzana AU - Marković, Smilja AU - Blagojević, Vladimir A. AU - Lević, Steva AU - Savić, Slobodan AU - Djordjević, Antonije AU - Pavlović, Vladimir PY - 2020 UR - http://aspace.agrif.bg.ac.rs/handle/123456789/5344 AB - Solid-state mechanical activation of MgO and alpha-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 degrees 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 degrees C for non-activated samples, and 1400 degrees C for activated samples. PB - Springer, Dordrecht T2 - Journal of Thermal Analysis and Calorimetry T1 - Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics EP - 107 IS - 1 SP - 95 VL - 140 DO - 10.1007/s10973-019-08846-w ER -
@article{ author = "Obradović, Nina and Fahrenholtz, William G. and Filipović, Suzana and Marković, Smilja and Blagojević, Vladimir A. and Lević, Steva and Savić, Slobodan and Djordjević, Antonije and Pavlović, Vladimir", year = "2020", abstract = "Solid-state mechanical activation of MgO and alpha-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 degrees 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 degrees C for non-activated samples, and 1400 degrees C for activated samples.", publisher = "Springer, Dordrecht", journal = "Journal of Thermal Analysis and Calorimetry", title = "Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics", pages = "107-95", number = "1", volume = "140", doi = "10.1007/s10973-019-08846-w" }
Obradović, N., Fahrenholtz, W. G., Filipović, S., Marković, S., Blagojević, V. A., Lević, S., Savić, S., Djordjević, A.,& Pavlović, V.. (2020). Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics. in Journal of Thermal Analysis and Calorimetry Springer, Dordrecht., 140(1), 95-107. https://doi.org/10.1007/s10973-019-08846-w
Obradović N, Fahrenholtz WG, Filipović S, Marković S, Blagojević VA, Lević S, Savić S, Djordjević A, Pavlović V. Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics. in Journal of Thermal Analysis and Calorimetry. 2020;140(1):95-107. doi:10.1007/s10973-019-08846-w .
Obradović, Nina, Fahrenholtz, William G., Filipović, Suzana, Marković, Smilja, Blagojević, Vladimir A., Lević, Steva, Savić, Slobodan, Djordjević, Antonije, Pavlović, Vladimir, "Formation kinetics and cation inversion in mechanically activated MgAl2O4 spinel ceramics" in Journal of Thermal Analysis and Calorimetry, 140, no. 1 (2020):95-107, https://doi.org/10.1007/s10973-019-08846-w . .