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Synthesis and high-temperature evolution of single-phase amorphous Si–Hf–N ceramics

Zhou, C. and Gao, X. and Xu, Y. and Buntkowsky, G. and Ikuhara, Y. and Riedel, R. and Ionescu, E. (2015):
Synthesis and high-temperature evolution of single-phase amorphous Si–Hf–N ceramics.
In: Journal of the European Ceramic Society, 35 (7), Elsevier Science Publishing, pp. 2007-2015, ISSN 09552219,
[Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2015.01.026],
[Article]

Abstract

Novel amorphous polymer-derived Si–Hf–N ceramics were prepared via ammonolysis of single-source precursors which were synthesized by the chemical reaction of a commercially available perhydropolysilazane (PHPS) with different amounts of tetrakis(dimethylamido) hafnium(IV) (TDMAH). The prepared Si–Hf–N materials were annealed in nitrogen atmosphere at different temperatures ranging from 1100 °C to 1800 °C and investigated with respect to their chemical composition, crystallization behavior and phase evolution. The single-source precursors converted upon heat treatment in ammonia environment at 1000 °C into amorphous single-phase ceramics and remained amorphous even after annealing at 1400 °C in nitrogen atmosphere. Electron microscopy investigation showed that the annealing of the highly homogeneous single-phase Si–Hf–N induces local enrichment (clustering) of Hf, leading to amorphous HfN/SiNx nanocomposites. Annealing in nitrogen at 1600 °C leads to the crystallization of HfN and Si3N4. The results of the present work emphasize a convenient preparative access to silicon–metal–nitride nanocomposites from suitable single-source precursors.

Item Type: Article
Erschienen: 2015
Creators: Zhou, C. and Gao, X. and Xu, Y. and Buntkowsky, G. and Ikuhara, Y. and Riedel, R. and Ionescu, E.
Title: Synthesis and high-temperature evolution of single-phase amorphous Si–Hf–N ceramics
Language: English
Abstract:

Novel amorphous polymer-derived Si–Hf–N ceramics were prepared via ammonolysis of single-source precursors which were synthesized by the chemical reaction of a commercially available perhydropolysilazane (PHPS) with different amounts of tetrakis(dimethylamido) hafnium(IV) (TDMAH). The prepared Si–Hf–N materials were annealed in nitrogen atmosphere at different temperatures ranging from 1100 °C to 1800 °C and investigated with respect to their chemical composition, crystallization behavior and phase evolution. The single-source precursors converted upon heat treatment in ammonia environment at 1000 °C into amorphous single-phase ceramics and remained amorphous even after annealing at 1400 °C in nitrogen atmosphere. Electron microscopy investigation showed that the annealing of the highly homogeneous single-phase Si–Hf–N induces local enrichment (clustering) of Hf, leading to amorphous HfN/SiNx nanocomposites. Annealing in nitrogen at 1600 °C leads to the crystallization of HfN and Si3N4. The results of the present work emphasize a convenient preparative access to silicon–metal–nitride nanocomposites from suitable single-source precursors.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 35
Number: 7
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Polymer-derived ceramic, Silicon–hafnium–nitride ceramic, Nanocomposite, Silicon nitride, Hafnium nitride
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 10 Mar 2015 08:33
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2015.01.026
Identification Number: doi:10.1016/j.jeurceramsoc.2015.01.026
Funders: The authors acknowledge the financial support from European Commission through the Marie-Curie ITN project “Functional Nitrides for Energy Applications, FUNEA” (FP7-PITN-GA-2010-264873)., A part of this study was also supported by the Joint Research Project between Japan (JSPS—Japan Society for the Promotion of Science) and Germany (DAAD—German Academic Exchange Service) through Bilateral Program. , YX and GB gratefully acknowledge financial support by the Deutsche Forschungsgemeinschaft. CZ acknowledges financial support from China Scholarship Council (CSC) during his stay at TU Darmstadt.
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