Synthesis and material properties of polymer-derived niobium carbide and niobium nitride nanocrystalline ceramics
| Autor: | Matthew Laskoski, Teddy M. Keller, Arianna Neal, Arica R. Shepherd, Boris Dyatkin, Jadah S. Clarke, Syed B. Qadri, Mehana N. Daftary, Wadia Mahzabeen, M. S. Osofsky, Joseph Prestigiacomo |
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| Rok vydání: | 2021 |
| Předmět: |
Niobium nitride
Materials science Niobium Sintering chemistry.chemical_element 02 engineering and technology Nitride 01 natural sciences chemistry.chemical_compound 0103 physical sciences Materials Chemistry Ceramic 010302 applied physics Hydride Process Chemistry and Technology 021001 nanoscience & nanotechnology Nanocrystalline material Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Chemical engineering visual_art Ceramics and Composites visual_art.visual_art_medium Niobium carbide 0210 nano-technology |
| Zdroj: | Ceramics International. 47:1163-1168 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2020.08.232 |
| Popis: | Nanocrystalline niobium carbide (NbC) ceramics and niobium carbide-niobium nitride (NbC/NbN) composites were synthesized at low temperatures without high-pressure sintering using a single-step polymer-derived approach from a meltable pre-ceramic blend. Niobium hydride (NbH5) and 1,2,4,5-tetrakis(phenylethynyl)benzene (TPEB) reacted at 1500 °C under argon or nitrogen in a tube furnace to form NbC or NbC/NbN with high purities and nanosized grains. Superconductivity measurements indicated that NbC/NbN ceramics exhibited a mixed phase system with two distinct Tc values, and higher elemental niobium content within solids yielded lower Tc. The resulting ceramic monoliths exhibited homogeneous morphologies and controllable amounts of free carbon in the composite matrix. Niobium carbide and nitride composites demonstrated good air oxidation stability up to 450 °C. |
| Databáze: | OpenAIRE |
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