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Sol–gel based synthesis and enhanced processability of MAX phase Cr2GaC
- Source :
- Journal of Materials Chemistry C. 7:6034-6040
- Publication Year :
- 2019
- Publisher :
- Royal Society of Chemistry (RSC), 2019.
-
Abstract
- MAX phases are typically prepared by high-temperature (oftentimes high-pressure) solid-state methods. Here, we report a new wet chemistry based synthesis technique starting from an aqueous solution of metal nitrates and citric acid to prepare MAX phase Cr2GaC. This solution-processable precursor mixture has the potential to be easily scaled, painted, printed or fabricated onto supports – an advantage that is demonstrated by the formation of hollow carbon microspheres which are decorated with Cr2GaC particles. A small amount of chromium carbide and oxide remains in the product, however, the amount of the latter can be reduced by a larger excess in citric acid in the precursor gel. The transformation mechanism of the initial amorphous gel into highly crystalline and anisotropic MAX phase particles is investigated by detailed thermal analysis. Transmission electron microscopy studies are conducted to elucidate the microstructure of the sol–gel-prepared particles as well as the decorated hollow microspheres. From magnetic susceptibility measurements, the density of states at the Fermi level is deduced reflecting the quality of the Pauli paramagnet Cr2GaC.
- Subjects :
- Materials science
Aqueous solution
Oxide
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
Microstructure
01 natural sciences
0104 chemical sciences
chemistry.chemical_compound
chemistry
Chemical engineering
Transmission electron microscopy
Phase (matter)
Materials Chemistry
MAX phases
0210 nano-technology
Wet chemistry
Sol-gel
Subjects
Details
- ISSN :
- 20507534 and 20507526
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Chemistry C
- Accession number :
- edsair.doi...........acc8e58643edf4b6e99b7b4a920cf8f8