Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 209, Issue 11, Pages 2241-2246Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201228317
Keywords
carbon nanotubes; phase transformations; Raman spectroscopy; spark plasma sintering; synchrotron radiation
Funding
- DFG-Deutschen Forschungsgemeinschaft (German Research Foundation) [BU 547/10-1, BU 547/10-2]
- Venture Cup-MV, Germany [UR 11 007 VC 2011]
- DESY Hasylab Project [II-20090264, I-20110661]
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Spark plasma sintering (SPS) of carbon nanotubes based materials to diamond was conducted at a very low pressure in vacuum and argon atmospheres. The phases and microstructures of the sintered samples were analyzed by Synchrotron X-ray, Raman spectroscopy, and scanning electron microscopy. Diamond phases are created from carbon nanotubes/FeNi mixtures at pressure of 9.55 MPa in vacuum and argon atmospheres during SPS. At this pressure, carbon flowers, and perfect diamond crystals are obtained at 1200 degrees C only in the argon atmosphere. The consequences provide an indirect evidence for the existence of plasma during SPS. The argon atmosphere promotes the plasma generation and thus enhances the diamond transition. (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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