Abstract

In this study, we have attempted to describe the phenomenon of vacancy formation in various types of diamonds (natural type IaAB, synthetic type Ib, synthetic type IIa, and type IaABC suspected of having been pretreated with an unknown method) using electron beam irradiation. After the electron beam irradiation, vacancies were formed in the natural type IaAB and synthetic type IIa diamonds, whereas vacancies were not formed in the synthetic type Ib and pre-treated type IaABC diamonds. From these results, we suggest a model of vacancy creation by electron beam irradiation in various types of diamonds. The irradiation was performed with electron dose densities of 1–6×1017/cm2 at 10 MeV, and with a heat treatment of two hours at a temperature of 900 °C. Electron beam-irradiated and heat-treated samples were analyzed using UV-Vis-NIR, FT-IR, and PL spectroscopy.

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