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Evolution of the local structure at Hf sites in SiHfOC upon ceramization of a hafnium-alkoxide-modified polysilsesquioxane: A perturbed angular correlation study
dc.creator | Umićević, Ana | |
dc.creator | Cekić, Božidar Đ. | |
dc.creator | Belošević-Čavor, Jelena | |
dc.creator | Koteski, Vasil J. | |
dc.creator | Papendorf, Benjamin | |
dc.creator | Riedel, Ralf | |
dc.creator | Ionescu, Emanuel | |
dc.date.accessioned | 2018-03-01T15:29:55Z | |
dc.date.available | 2018-03-01T15:29:55Z | |
dc.date.issued | 2015 | |
dc.identifier.issn | 0955-2219 | |
dc.identifier.issn | 1873-619X | |
dc.identifier.uri | https://vinar.vin.bg.ac.rs/handle/123456789/185 | |
dc.description.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. | en |
dc.relation | info:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/171001/RS// | |
dc.relation | German Science Foundation (DFG) [DFG: IO 64/7-1] | |
dc.rights | restrictedAccess | en |
dc.source | Journal of the European Ceramic Society | en |
dc.subject | Polymer-derived ceramics (PDCs) | en |
dc.subject | Perturbed angular correlation (PAC) | en |
dc.subject | HfO2/SiOC nanocomposites | en |
dc.subject | Polymer-to-ceramic transformation | en |
dc.subject | Nanostructure evolution | en |
dc.title | Evolution of the local structure at Hf sites in SiHfOC upon ceramization of a hafnium-alkoxide-modified polysilsesquioxane: A perturbed angular correlation study | en |
dc.type | article | en |
dcterms.abstract | Ионесцу, Емануел; Умићевић, Aна; Котески Васил Ј.; Белошевић-Чавор Јелена; Папендорф, Бењамин; Цекиц, Бозидар Д.; Риедел, Ралф; | |
dc.citation.volume | 35 | |
dc.citation.issue | 1 | |
dc.citation.spage | 29 | |
dc.citation.epage | 35 | |
dc.identifier.wos | 000344123700003 | |
dc.identifier.doi | 10.1016/j.jeurceramsoc.2014.08.023 | |
dc.citation.rank | M21a | |
dc.type.version | publishedVersion | |
dc.identifier.scopus | 2-s2.0-85027925752 |
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