Industrial diamonds grown in Ni70Mn25Co5--graphite--sulfur system under HPHT |
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Authors: | Zhou Lin Jia Xiao-Peng Ma Hong-An Zheng You-Jin and Li Yan-Tao |
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Institution: | [1]National Laboratory of Superhard Materials, Jilin University, Changchun 130012, China [2]Physics Department, Heilongjiang University, Harbin 150080, China [3]Henan Polytechnic University, Jiaozuo 454000, China |
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Abstract: | This paper reports that diamond single crystals were synthesized
from sulfur-added Ni70Mn25Co5+C system under high
pressure and high temperature (HPHT). It was found that additive
sulfur had inhibited the nucleation and growth of diamond to some
extent. X-ray diffraction of the collected sample indicated that
under the synthesis conditions, a new compound MnS had been formed
through the reaction of additive sulfur with manganese in the
catalyst. The MnS has a fcc structure, and its average crystal size
was about 30 nm. By scanning electron microscope, the
{111} surface of diamond was found to be flat, while there was
usually a large depression on the central region of {100}.
Further observation showed that there were many small upside-down
pyramidal pits in the expression. The results of x-ray photoelectron
spectroscopy shows that MnS can only be detected in the depression
in the range of detection precision. It was inferred that MnS had
been dissolved in the melted alloy during the growth experiment, and
precipitated in the sequent quenching process. |
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Keywords: | sulfur diamond morphology MnS |
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