Thermal stability of MAX phases
The susceptibility of MAX phases to thermal dissociation at 1300-1550 °C in high vacuum has been studied using in-situ neutron diffraction. Above 1400 °C, MAX phases decomposed to binary carbide (e.g. TiCx) or binary nitride (e.g. TiNx), primarily through the sublimation of A-elements such as Al or...
| Main Authors: | , |
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| Format: | Journal Article |
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Trans Tech Publications Ltd
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/48124 |
| Summary: | The susceptibility of MAX phases to thermal dissociation at 1300-1550 °C in high vacuum has been studied using in-situ neutron diffraction. Above 1400 °C, MAX phases decomposed to binary carbide (e.g. TiCx) or binary nitride (e.g. TiNx), primarily through the sublimation of A-elements such as Al or Si, which results in a porous surface layer of MXx being formed. Positive activation energies were determined for decomposed MAX phases with coarse pores but a negative activation energy when the pore size was less than 1.0 ìm. The insights for tailor-design of MAX phases with controlled thermal stability and intercalated MXenes for energy storage are addressed. © (2014) Trans Tech Publications, Switzerland. |
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