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Sinterability of the oxynitride LaTiO2N with perovskite-type structure
Ist Teil von
Journal of alloys and compounds, 2014, Vol.586, p.567-573
Ort / Verlag
Kidlington: Elsevier B.V
Erscheinungsjahr
2014
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
•LaTiO2N is thermodynamically unstable above 400°C in air and 800°C in argon.•LaTiO2N ceramics with 74–94% TD and 57–90wt% LaTiO2N were prepared by SPS.•The 94% TD is higher than any other counterparts prepared so far.•SPS enables the preparation of almost dense LaTiO2N bulks with adequate purity.
Based on a thermal stability study, the sinterability of the oxynitride LaTiO2N was investigated by spark plasma sintering (SPS). The results show that LaTiO2N is thermodynamically unstable above ca. 400°C in air and ca. 800°C in argon. While it appears impossible to completely avoid decomposition during sintering, LaTiO2N ceramics with relative density of 74–94% and a residual LaTiO2N content of 57–90wt% were prepared. By manipulating kinetics, a relative density of 94% was achieved at 1350°C under an uniaxially applied pressure of 125MPa. This density is higher than any other counterparts prepared by conventional sintering so far. SPS appears a feasible tool for manipulating the sintering kinetics. It enables the preparation of almost dense LaTiO2N bulks with adequate purity.