The enhanced optical properties of chemical vapor deposited(CVD)diamond have been pursued in academia and industry.However,the barrier of CVD technology limits the application field of diamond.Herein,the performance of CVD polycrystalline diamond was successfully improved by high-pressure and high-temperature(HPHT)treatment.The microstructures of CVD polycrystalline diamond before and after HPHT treatments were thoroughly examined using optical microscope,UV-visible and infrared absorption,Raman spectroscopy,scanning electron microscope(SEM)and transmission electron microscope(TEM).It is found that the transparency of the CVD samples at 10 GPa increases dramatically with processing temperatures,from the original opacity to al-most full optical transparency.Through spectroscopic and microstructural analyses,the modification mechanism of CVD polycrystalline diamond under HPHT conditions is pro-posed.The HPHT treatment improves the optical properties of the initial CVD polycrys-talline diamond while reducing the technical difficulty of synthesizing high transparency diamond materials with pure sp3 bonding,which has dual scientific and practical signifi-cance.
关键词
CVD金刚石/透明度/高温高压/改性机理
Key words
CVD diamond/Transparency/High temperature and high pressure/Modifica-tion mechanism
维普
万方数据