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In Situ High‐Temperature Diffraction Study of the Thermal Dissociation of Ti 3 AlC 2 in Vacuum
Author(s) -
Pang WeiKong,
Low ItMeng,
Sun ZhengMing
Publication year - 2010
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2010.03764.x
Subject(s) - materials science , sublimation (psychology) , analytical chemistry (journal) , annealing (glass) , diffraction , synchrotron radiation , neutron diffraction , activation energy , thermal stability , ultra high vacuum , dissociation (chemistry) , in situ , x ray crystallography , chemistry , composite material , optics , nanotechnology , psychology , physics , organic chemistry , chromatography , psychotherapist
In this paper, the effect of high‐temperature vacuum annealing on the dynamic phase stability and phase transition of Ti 3 AlC 2 at up to 1550°C was studied using in situ neutron diffraction. The decomposition of Ti 3 AlC 2 into TiC x at an elevated temperature was observed to occur through the continuous sublimation of Al and Ti species in a dynamic environment of high vacuum. The rate of decomposition decreased with increasing temperature, resulting in negative apparent activation energy (i.e., −71.9 kJ/mol). Depth profiling of vacuum‐annealed Ti 3 AlC 2 by grazing‐synchrotron radiation diffraction has revealed a graded composition of TiC x at the near‐surface.