High pressure and high temperature treatment of chemical vapor deposited polycrystalline diamond: From opaque to transparent. Issue 8 (July 2023)

• Record Type: Journal Article
• Authors: Zheng, Linpeng; Wang, Junpu; Li, Qian; Zhang, Jiawei; Zhou, Li; He, Duanwei; Zhan, Guodong (David); Li, Bodong; Aljohar, Abdulwahab
• Is Part Of: Journal of the European Ceramic Society. Volume 43:Issue 8(2023)
• Page Start: 3096
• Page End: 3103
• Publication Date: 2023-07
• Subjects: CVD diamond -- High pressure and high temperature -- Transparent CVD Diamond -- Modification -- Transparency mechanism; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2023.02.008
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: The enhanced optical properties of chemical vapor deposited (CVD) diamond have been pursued in academia and industry for many applications. However, the barrier of CVD technology limits the application field of diamond. Herein, the performance of CVD polycrystalline diamond thick films was improved by high-pressure and high-temperature (HPHT) treatment. The microstructures of CVD polycrystalline diamond films 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 almost full optical transparency. Through spectroscopic and microstructural analyses, the modification mechanism of CVD polycrystalline diamond under HPHT conditions is proposed. The results show that the HPHT treatment can significantly enhance the optical properties of the starting CVD polycrystalline diamond films.