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Study on the crack phenomenon of heavy FeS doped Ib diamond crystals with {111} surface as growth surface in Fe-Ni-C system

Abstract

In this paper, the characteristics of heavy FeS doped diamond crystals were studied by using a China-type large volume Cubic high-pressure apparatus(CHPA) with FeNi alloy as catalyst at 6.0GPa-6.5GPa and 1350-1400°C.The crystals were characterized by optical microscopy (OM), scanning electron microscopy (SEM), x-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy (Raman).The OM of the crystal shows that crystals will crack when the doping ratio is increased, and the increase of pressure is beneficial to alleviate the phenomenon of cracking.The XPS spectrum of the crystal shows that S successfully enters the diamond lattice in three bonding modes: C-SO2-C6H5, C-S-SO2-C and C-S under high concentration doping conditions.The infrared spectrum shows that the content of N in the crystal decreases with the increase of doping ratio.Raman spectroscopy analysis shows that the heavy FeS doped Ib type diamond single crystal has a high quality sp3 structure, and full width at half maximum (FWHM) of the crystal gradually broadens as the doping ratio increases.Raman spectroscopy shows that increasing the pressure under the same doping concentration is beneficial to increase the crystallinity of the crystal.

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Publication details

The article was received on 06 Nov 2019, accepted on 04 Dec 2019 and first published on 04 Dec 2019


Article type: Paper
DOI: 10.1039/C9CE01759C
CrystEngComm, 2019, Accepted Manuscript

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    Study on the crack phenomenon of heavy FeS doped Ib diamond crystals with {111} surface as growth surface in Fe-Ni-C system

    S. Fang, H. Ma, Z. Cai, C. Wang, C. Fang, Z. Zhao, Z. Lu, Y. Wang, L. Chen and X. Jia, CrystEngComm, 2019, Accepted Manuscript , DOI: 10.1039/C9CE01759C

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