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Sinterability of the oxynitride LaTiO2N with perovskite-type structure

Li, Duan and Li, Wenjie and Fasel, Claudia and Shen, James and Riedel, Ralf (2014):
Sinterability of the oxynitride LaTiO2N with perovskite-type structure.
In: Journal of Alloys and Compounds, Elsevier Science Publishing, pp. 567-573, 586, ISSN 09258388,
[Online-Edition: http://dx.doi.org/10.1016/j.jallcom.2013.10.071],
[Article]

Abstract

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 57–90 wt% were prepared. By manipulating kinetics, a relative density of 94% was achieved at 1350 °C under an uniaxially applied pressure of 125 MPa. 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.

Item Type: Article
Erschienen: 2014
Creators: Li, Duan and Li, Wenjie and Fasel, Claudia and Shen, James and Riedel, Ralf
Title: Sinterability of the oxynitride LaTiO2N with perovskite-type structure
Language: English
Abstract:

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 57–90 wt% were prepared. By manipulating kinetics, a relative density of 94% was achieved at 1350 °C under an uniaxially applied pressure of 125 MPa. 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.

Journal or Publication Title: Journal of Alloys and Compounds
Volume: 586
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Spark plasma sintering, Perovskite-type oxynitride, Sinterability, Thermal analysis, Kinetics, X-ray diffraction
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: 21 Feb 2014 09:37
Official URL: http://dx.doi.org/10.1016/j.jallcom.2013.10.071
Identification Number: doi:10.1016/j.jallcom.2013.10.071
Funders: This work was supported by European Commission through the Marie-Curie ITN project “FUnctional Nitrides for Energy Applications, FUNEA” (FP7-PITN-GA-2010-264873).
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