The influence of mechanical activation on structural evolution of nanocrystalline SrTiO3 powders

2017
Authors
Zivojinović, JelenaPavlović, Vera P.

Kosanović, Darko

Marković, Smilja

Krstić, Jugoslav

Blagojević, Vladimir A.

Pavlović, Vladimir

Article (Published version)

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Show full item recordAbstract
Structural changes caused by mechanical activation of SrTiO3 powders were investigated using a variety of methods. Average crystallite size continuously decreased with increased activation time to around 20 nm after 120 min activation, while mesopore volume and specific surface area increased accordingly. Higher activation times lead to increased agglomeration of nanoparticles to form agglomerates of around 2 mu m in size, ultimately producing a relatively stable powder, which exhibits lower microstrain than powders activated for shorter periods of time. Raman spectroscopy shows that the behavior of TO2 and TO4 modes is consistent with a decrease in particle size, while behavior of the nonpolar TO3 mode is markedly different, indicating relaxation of the inversion symmetry in polycrystalline SrTiO3. UV-VIS spectra show that mechanical activation has negligible effect on SrTiO3, with a slight shift caused by TiO2 contamination due to presence of air. Other than this, the mechanical acti...vation process preserves the chemical purity of the initial powder.
Keywords:
Mechanical activation / SrTiO3 / Microstructure / Ball milling / Size dependenceSource:
Journal of Alloys and Compounds, 2017, 695, 863-870Publisher:
- Elsevier Science Sa, Lausanne
Funding / projects:
DOI: 10.1016/j.jallcom.2016.10.159
ISSN: 0925-8388
WoS: 000391817600104
Scopus: 2-s2.0-85005917614
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Poljoprivredni fakultetTY - JOUR AU - Zivojinović, Jelena AU - Pavlović, Vera P. AU - Kosanović, Darko AU - Marković, Smilja AU - Krstić, Jugoslav AU - Blagojević, Vladimir A. AU - Pavlović, Vladimir PY - 2017 UR - http://aspace.agrif.bg.ac.rs/handle/123456789/4358 AB - Structural changes caused by mechanical activation of SrTiO3 powders were investigated using a variety of methods. Average crystallite size continuously decreased with increased activation time to around 20 nm after 120 min activation, while mesopore volume and specific surface area increased accordingly. Higher activation times lead to increased agglomeration of nanoparticles to form agglomerates of around 2 mu m in size, ultimately producing a relatively stable powder, which exhibits lower microstrain than powders activated for shorter periods of time. Raman spectroscopy shows that the behavior of TO2 and TO4 modes is consistent with a decrease in particle size, while behavior of the nonpolar TO3 mode is markedly different, indicating relaxation of the inversion symmetry in polycrystalline SrTiO3. UV-VIS spectra show that mechanical activation has negligible effect on SrTiO3, with a slight shift caused by TiO2 contamination due to presence of air. Other than this, the mechanical activation process preserves the chemical purity of the initial powder. PB - Elsevier Science Sa, Lausanne T2 - Journal of Alloys and Compounds T1 - The influence of mechanical activation on structural evolution of nanocrystalline SrTiO3 powders EP - 870 SP - 863 VL - 695 DO - 10.1016/j.jallcom.2016.10.159 ER -
@article{ author = "Zivojinović, Jelena and Pavlović, Vera P. and Kosanović, Darko and Marković, Smilja and Krstić, Jugoslav and Blagojević, Vladimir A. and Pavlović, Vladimir", year = "2017", abstract = "Structural changes caused by mechanical activation of SrTiO3 powders were investigated using a variety of methods. Average crystallite size continuously decreased with increased activation time to around 20 nm after 120 min activation, while mesopore volume and specific surface area increased accordingly. Higher activation times lead to increased agglomeration of nanoparticles to form agglomerates of around 2 mu m in size, ultimately producing a relatively stable powder, which exhibits lower microstrain than powders activated for shorter periods of time. Raman spectroscopy shows that the behavior of TO2 and TO4 modes is consistent with a decrease in particle size, while behavior of the nonpolar TO3 mode is markedly different, indicating relaxation of the inversion symmetry in polycrystalline SrTiO3. UV-VIS spectra show that mechanical activation has negligible effect on SrTiO3, with a slight shift caused by TiO2 contamination due to presence of air. Other than this, the mechanical activation process preserves the chemical purity of the initial powder.", publisher = "Elsevier Science Sa, Lausanne", journal = "Journal of Alloys and Compounds", title = "The influence of mechanical activation on structural evolution of nanocrystalline SrTiO3 powders", pages = "870-863", volume = "695", doi = "10.1016/j.jallcom.2016.10.159" }
Zivojinović, J., Pavlović, V. P., Kosanović, D., Marković, S., Krstić, J., Blagojević, V. A.,& Pavlović, V.. (2017). The influence of mechanical activation on structural evolution of nanocrystalline SrTiO3 powders. in Journal of Alloys and Compounds Elsevier Science Sa, Lausanne., 695, 863-870. https://doi.org/10.1016/j.jallcom.2016.10.159
Zivojinović J, Pavlović VP, Kosanović D, Marković S, Krstić J, Blagojević VA, Pavlović V. The influence of mechanical activation on structural evolution of nanocrystalline SrTiO3 powders. in Journal of Alloys and Compounds. 2017;695:863-870. doi:10.1016/j.jallcom.2016.10.159 .
Zivojinović, Jelena, Pavlović, Vera P., Kosanović, Darko, Marković, Smilja, Krstić, Jugoslav, Blagojević, Vladimir A., Pavlović, Vladimir, "The influence of mechanical activation on structural evolution of nanocrystalline SrTiO3 powders" in Journal of Alloys and Compounds, 695 (2017):863-870, https://doi.org/10.1016/j.jallcom.2016.10.159 . .