Thermally-driven morphogenesis of niobium nanoparticles as witnessed by in-situ x-ray scattering (CROSBI ID 301045)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Košutová, Tereza ; Horák, Lukáš ; Pleskunov, Pavel ; Hanuš, Jan ; Nikitin, Daniil ; Kúš, Peter ; Cieslar, Miroslav ; Gordeev, Ivan ; Burazer, Sanja ; Choukourov, Andrei ; Dopita, Milan
engleski
Thermally-driven morphogenesis of niobium nanoparticles as witnessed by in-situ x-ray scattering
Highly porous structures consisting of niobium nanoparticles (Nb NPs) are prepared using magnetron sputtering and inert gas aggregation method. Alongside the thermally-driven evolution of nanoparticle morphology, the microstructural genesis is probed in-situ by x-ray diffraction for the temperature range up to 800 °C. The as- deposited Nb NPs are formed by the Nb core and NbOx shell. The elevated temperature triggers the gradual oxidation that proceeds until 200 °C. Above this point the structure is fully amorphous. Further increase of the temperature to 450 °C leads to a transition to the crystalline TT-Nb2O5 phase, which hexagonal structure was solved in the current study. The subsequent rise of the temperature to 600 °C results in the conversion to the orthorhombic T-Nb2O5 phase. Up to this state, the size of nanoparticles corresponds to the size of crystallites. The annealing above 600 °C causes coalescence of NPs with the formation of hundreds- of-nanometers large structures.
Niobium nanoparticles ; Small angle x-ray scattering ; In-situ x-ray diffraction ; Niobium pentoxide ; Thermal evolution
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Podaci o izdanju
277
2021.
125466
10
objavljeno
0254-0584
1879-3312
10.1016/j.matchemphys.2021.125466