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Synthesis and rapid sintering of dense SrA(O,N)3 (A=Mo, W) oxynitride ceramics

Li, Wenjie and Li, Duan and Gurlo, Aleksander and Shen, Zhijian and Riedel, Ralf and Ionescu, Emanuel (2015):
Synthesis and rapid sintering of dense SrA(O,N)3 (A=Mo, W) oxynitride ceramics.
In: Journal of the European Ceramic Society, Elsevier Science Publishing, pp. 3273-3281, 35, (12), ISSN 09552219,
[Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2014.12.014],
[Article]

Abstract

SrMo(O,N)3 and SrW(O,N)3 oxynitride powders were synthesized via a solvothermal route followed by ammonolysis. Their rapid densification by spark plasma sintering with a heating rate of 300–400 °C/min under a uniaxial pressure of 100 MPa yielded dense monoliths. The lowest open porosity achieved was 0 vol% for SrMo(O,N)3 and 7.6 vol% for SrW(O,N)3. The compacted monoliths were characterized by elemental analysis, electron microscopy (SEM, TEM) coupled with energy dispersive X-ray spectroscopy (EDX), as well as X-ray diffraction (XRD). Rietveld refinement of the XRD patterns revealed in the case of the compacted SrMo(O,N)3 the formation of small amount of ternary oxides (Sr3Mo2O7/SrMoO4/Sr3MoO6), molybdenum nitride (Mo2N), as well as metallic Mo. On the contrary, SrW(O,N)3 exhibited significant decomposition after consolidation, with SrWO4/Sr3WO6 being main components beside SrMo(O,N)3, accompanied by tungsten nitride (WN) and metallic W. Thus, rapid SPS enables the densification of oxynitrides with high density and acceptable purity that were hardly achieved earlier.

Item Type: Article
Erschienen: 2015
Creators: Li, Wenjie and Li, Duan and Gurlo, Aleksander and Shen, Zhijian and Riedel, Ralf and Ionescu, Emanuel
Title: Synthesis and rapid sintering of dense SrA(O,N)3 (A=Mo, W) oxynitride ceramics
Language: English
Abstract:

SrMo(O,N)3 and SrW(O,N)3 oxynitride powders were synthesized via a solvothermal route followed by ammonolysis. Their rapid densification by spark plasma sintering with a heating rate of 300–400 °C/min under a uniaxial pressure of 100 MPa yielded dense monoliths. The lowest open porosity achieved was 0 vol% for SrMo(O,N)3 and 7.6 vol% for SrW(O,N)3. The compacted monoliths were characterized by elemental analysis, electron microscopy (SEM, TEM) coupled with energy dispersive X-ray spectroscopy (EDX), as well as X-ray diffraction (XRD). Rietveld refinement of the XRD patterns revealed in the case of the compacted SrMo(O,N)3 the formation of small amount of ternary oxides (Sr3Mo2O7/SrMoO4/Sr3MoO6), molybdenum nitride (Mo2N), as well as metallic Mo. On the contrary, SrW(O,N)3 exhibited significant decomposition after consolidation, with SrWO4/Sr3WO6 being main components beside SrMo(O,N)3, accompanied by tungsten nitride (WN) and metallic W. Thus, rapid SPS enables the densification of oxynitrides with high density and acceptable purity that were hardly achieved earlier.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 35
Number: 12
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Perovskite, Oxynitride, Spark plasma sintering, Densification, Microstructure
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: 22 Jun 2015 10:57
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2014.12.014
Additional Information:

8th International Symposium on Nitrides in Conjunction with the 7th International Workshop on Spinel Nitrides and Related Materials and the Annual Meeting of the Marie Curie ITN 7th Framework Programme FUNEA

Identification Number: doi:10.1016/j.jeurceramsoc.2014.12.014
Funders: Financial support of this work by European Commission through the Marie-Curie ITN project “Functional Nitrides for Energy Applications, FUNEA” (FP7-PITN-GA-2010-264873) is gratefully acknowledged.
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