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

Wenjie Li, Duan Li, Aleksander Gurlo, Zhijian Shen, Ralf Riedel, Emanuel Ionescu

Research output: Contribution to journalArticle

3 Scopus citations

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 100MPa yielded dense monoliths. The lowest open porosity achieved was 0vol% for SrMo(O,N)3 and 7.6vol% 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.

Original languageEnglish (US)
Pages (from-to)3273-3281
Number of pages9
JournalJournal of the European Ceramic Society
Volume35
Issue number12
DOIs
StatePublished - Oct 1 2015

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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