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Enhancing electrical properties through in-situ controlled nanocrystallization of V2O5–TeO2 glass

V 2 O 5 –TeO 2 glass–ceramics (VTGC) were prepared by controlled annealing of the V 2 O 5 –TeO 2 glass (VTG), which illustrates a parent glass matrix with a single charge carrier. The annealing proceeded at six temperatures selected between the glass transition and the maximum of the first crystalli...

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Bibliographic Details
Published in:Journal of materials science 2024-07, Vol.59 (27), p.12600-12612
Main Authors: Okoczuk, Piotr, Kwiatkowska, Agnieszka, Murawski, Leon, Pietrzak, Tomasz K., Wójcik, Natalia A., Garmroudi, Fabian, Wicikowski, Leszek, Kościelska, Barbara
Format: Article
Language:English
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Summary:V 2 O 5 –TeO 2 glass–ceramics (VTGC) were prepared by controlled annealing of the V 2 O 5 –TeO 2 glass (VTG), which illustrates a parent glass matrix with a single charge carrier. The annealing proceeded at six temperatures selected between the glass transition and the maximum of the first crystallization process to obtain various nanocrystallite sizes. Heat treatment caused an increase in DC conductivity by 2.5–3.5 (250–285 °C) order of magnitude. Using thermal analysis, the crystal growth process was determined to be 1D. Structural studies show that the obtained materials are partially amorphous and polycrystalline with nanometer-sized crystallites. Subtle thread-like structures were observed using conductive AFM. The activation energy of the conduction process decreased from 0.38 eV in VTG to 0.18–0.11 eV (250–285 °C) in VTGC. The radii of crystallites were calculated based on the theoretical model of electron hopping between connected semiconducting nanocrystallites and vary between 1.7 and 2.8 nm (250–285 °C). Thermoelectric studies indicate constant carrier concentration. Features characteristic of small polaron hopping-governed materials were observed. We suggest V 3 O 7 nanocrystals as conductive media in VTGC. Graphical abstract
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-024-09957-y