期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 586, 期 -, 页码 567-573出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.10.071
关键词
Spark plasma sintering; Perovskite-type oxynitride; Sinterability; Thermal analysis; Kinetics; X-ray diffraction
资金
- European Commission [FP7-PITN-GA-2010-264873]
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 degrees C in air and ca. 800 degrees 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 degrees 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. (C) 2013 Elsevier B. V. All rights reserved.
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