Evolution of the local structure at Hf sites in SiHfOC upon ceramization of a hafnium-alkoxide-modified polysilsesquioxane: A perturbed angular correlation study
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Аутори
Umićević, AnaCekić, Božidar Đ.
Belošević-Čavor, Jelena
Koteski, Vasil J.
Papendorf, Benjamin
Riedel, Ralf
Ionescu, Emanuel
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
The evolution of the environment of Hf sites in a hafnium-alkoxide-modified polysilsesquioxane upon polymer-to-ceramic transformation was investigated via the perturbed angular correlation (PAC) method. The results of the PAC measurements on samples thermally treated at temperatures from 400 to 1300 degrees C indicate that Hf is surrounded only by oxygen at all studied temperatures. This finding is in agreement with the evolution pathway of polymer-derived SiHfOC ceramics, which were reported to be generated as single-phase amorphous materials upon pyrolysis of alkoxide-modified polysiloxanes and subsequently to phase separate and crystallize towards HfO2/SiOC nanocomposites. Thus, the results presented here support our previous statement that there is a thermodynamic control on the phase separation and crystallization behavior of Si-M-O-C (M = metal) ceramics (Ionescu et al. 96;2013:1899-1903), which in the case of Hf leads to the precipitation and crystallization of hafnia nanopartic...les within a SiOC matrix. (C) 2014 Elsevier Ltd. All rights reserved.
Кључне речи:
Polymer-derived ceramics (PDCs) / Perturbed angular correlation (PAC) / HfO2/SiOC nanocomposites / Polymer-to-ceramic transformation / Nanostructure evolutionИзвор:
Journal of the European Ceramic Society, 2015, 35, 1, 29-35Финансирање / пројекти:
- Истраживање интерметалика и полупроводника и могућа примена у обновљивим изворима енергије (RS-MESTD-Basic Research (BR or ON)-171001)
- German Science Foundation (DFG) [DFG: IO 64/7-1]
DOI: 10.1016/j.jeurceramsoc.2014.08.023
ISSN: 0955-2219; 1873-619X
WoS: 000344123700003
Scopus: 2-s2.0-85027925752
Колекције
Институција/група
VinčaTY - JOUR AU - Umićević, Ana AU - Cekić, Božidar Đ. AU - Belošević-Čavor, Jelena AU - Koteski, Vasil J. AU - Papendorf, Benjamin AU - Riedel, Ralf AU - Ionescu, Emanuel PY - 2015 UR - https://vinar.vin.bg.ac.rs/handle/123456789/185 AB - The evolution of the environment of Hf sites in a hafnium-alkoxide-modified polysilsesquioxane upon polymer-to-ceramic transformation was investigated via the perturbed angular correlation (PAC) method. The results of the PAC measurements on samples thermally treated at temperatures from 400 to 1300 degrees C indicate that Hf is surrounded only by oxygen at all studied temperatures. This finding is in agreement with the evolution pathway of polymer-derived SiHfOC ceramics, which were reported to be generated as single-phase amorphous materials upon pyrolysis of alkoxide-modified polysiloxanes and subsequently to phase separate and crystallize towards HfO2/SiOC nanocomposites. Thus, the results presented here support our previous statement that there is a thermodynamic control on the phase separation and crystallization behavior of Si-M-O-C (M = metal) ceramics (Ionescu et al. 96;2013:1899-1903), which in the case of Hf leads to the precipitation and crystallization of hafnia nanoparticles within a SiOC matrix. (C) 2014 Elsevier Ltd. All rights reserved. T2 - Journal of the European Ceramic Society T1 - Evolution of the local structure at Hf sites in SiHfOC upon ceramization of a hafnium-alkoxide-modified polysilsesquioxane: A perturbed angular correlation study VL - 35 IS - 1 SP - 29 EP - 35 DO - 10.1016/j.jeurceramsoc.2014.08.023 ER -
@article{ author = "Umićević, Ana and Cekić, Božidar Đ. and Belošević-Čavor, Jelena and Koteski, Vasil J. and Papendorf, Benjamin and Riedel, Ralf and Ionescu, Emanuel", year = "2015", abstract = "The evolution of the environment of Hf sites in a hafnium-alkoxide-modified polysilsesquioxane upon polymer-to-ceramic transformation was investigated via the perturbed angular correlation (PAC) method. The results of the PAC measurements on samples thermally treated at temperatures from 400 to 1300 degrees C indicate that Hf is surrounded only by oxygen at all studied temperatures. This finding is in agreement with the evolution pathway of polymer-derived SiHfOC ceramics, which were reported to be generated as single-phase amorphous materials upon pyrolysis of alkoxide-modified polysiloxanes and subsequently to phase separate and crystallize towards HfO2/SiOC nanocomposites. Thus, the results presented here support our previous statement that there is a thermodynamic control on the phase separation and crystallization behavior of Si-M-O-C (M = metal) ceramics (Ionescu et al. 96;2013:1899-1903), which in the case of Hf leads to the precipitation and crystallization of hafnia nanoparticles within a SiOC matrix. (C) 2014 Elsevier Ltd. All rights reserved.", journal = "Journal of the European Ceramic Society", title = "Evolution of the local structure at Hf sites in SiHfOC upon ceramization of a hafnium-alkoxide-modified polysilsesquioxane: A perturbed angular correlation study", volume = "35", number = "1", pages = "29-35", doi = "10.1016/j.jeurceramsoc.2014.08.023" }
Umićević, A., Cekić, B. Đ., Belošević-Čavor, J., Koteski, V. J., Papendorf, B., Riedel, R.,& Ionescu, E.. (2015). Evolution of the local structure at Hf sites in SiHfOC upon ceramization of a hafnium-alkoxide-modified polysilsesquioxane: A perturbed angular correlation study. in Journal of the European Ceramic Society, 35(1), 29-35. https://doi.org/10.1016/j.jeurceramsoc.2014.08.023
Umićević A, Cekić BĐ, Belošević-Čavor J, Koteski VJ, Papendorf B, Riedel R, Ionescu E. Evolution of the local structure at Hf sites in SiHfOC upon ceramization of a hafnium-alkoxide-modified polysilsesquioxane: A perturbed angular correlation study. in Journal of the European Ceramic Society. 2015;35(1):29-35. doi:10.1016/j.jeurceramsoc.2014.08.023 .
Umićević, Ana, Cekić, Božidar Đ., Belošević-Čavor, Jelena, Koteski, Vasil J., Papendorf, Benjamin, Riedel, Ralf, Ionescu, Emanuel, "Evolution of the local structure at Hf sites in SiHfOC upon ceramization of a hafnium-alkoxide-modified polysilsesquioxane: A perturbed angular correlation study" in Journal of the European Ceramic Society, 35, no. 1 (2015):29-35, https://doi.org/10.1016/j.jeurceramsoc.2014.08.023 . .