High-pressure synthesis of diamond from phenolic resin |
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Authors: | AKIFUMI ONODERA KATSUTOMO TERASHIMA TAKESHI URUSHIHARA KAICHI SUITO HITOSHI SUMIYA SHUICHI SATOH |
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Affiliation: | (1) Faculty of Engineering Science, Osaka University, Toyonaka Osaka 560, Japan;(2) Itami Research Laboratory, Sumitomo Electric Co., Itami Hyogo 664, Japan |
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Abstract: | Two kinds of phenolic resin, novolak and resols, have been studied with an addition of cobalt at pressures between 2 and 4
GPa and at temperatures from 1300 to 1900 °C, all under thermodynamically graphite-stable conditions. Diamond was synthesized
from these resins which had been pre-fired at 500–1000 °C. From such resins, carbon precursors carrying a great number of
radicals, being nearly free of hydrogen and oxygen, and turbostratic in structure, can be constructed. The pressure–temperature
conditions suitable for the diamond synthesis were dependent on the pre-firing temperatures. The cobalt served as a catalyst–solvent,
similar to the case of conventional diamond synthesis from graphite under diamond-stable conditions. Well-defined single crystals
cubo-octahedral in shape, measuring 0.3–0.7 mm across and classified as type Ib were obtained.
This revised version was published online in November 2006 with corrections to the Cover Date. |
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