Synergistic influences of titanium, boron, and oxygen on large-size single-crystal diamond growth at high pressure and high temperature

Abstract

In this study, the synergistic impact of boron, oxygen and titanium on growing large single-crystal diamonds was studied using different concentrations of B2O3 in a solvent-carbon system under 5.5-5.7 GPa and 1300-1500 ℃. The study found that it was difficult for boron atoms to enter the crystal when boron and oxygen impurities were doped using B2O3 without the addition of Ti. However, a high boron content was achieved in the doped diamonds that were synthesised with the addition of Ti. Additionally, boron-oxygen complexes were found on the surface of the crystal, and oxygen-related impurities appeared in the crystal interior when Ti added in the FeNi-C system. The results showed that the introduction of Ti in the synthesis cavity could effectively control the amount of boron and oxygen in the crystal. This not only has important scientific significance for understanding the synergistic influence of boron, oxygen and titanium on the growth of diamond in the earth, but also for the preparation of high-concentration boron or oxygen containing semiconductor diamond technologies.

Hydrogen Peroxide Synthesis via Electrocatalytic Water Oxidation on sp3 and sp2 Carbon Materials Mediated by Carbonates and Bicarbonates

“…Meanwhile, there are strong absorption peaks around 1130 cm –1 , which are the characteristics of C-centre nitrogen in diamond (isolated substitutional nitrogen atoms). With the introduction of boron impurities, for 1-BDD, 3-BDD, and 5-BDD, only a peak at 1290 cm –1 that was gradually becoming stronger was present, which corresponded to a single phonon absorption peak of boron impurity in diamond. ,, …”

“…The sample assembly is shown in Figure b. After the experiment, the residual solvent in the samples was removed with diluted HNO 3 (H 2 O and HNO 3 3:1, v/v), and the graphite was removed from the surface of the crystals by a hot mixed solution of H 2 SO 4 and HNO 3 (3:1, v/v). − The detailed growth assembly used in this work has been described in our previous work . Then, the samples were cut to obtain the required crystal shape (Figure c).…”

“…40−42 The detailed growth assembly used in this work has been described in our previous work. 42 Then, the samples were cut to obtain the required crystal shape (Figure 1c). The crystalline phases of synthetic diamonds were characterized by Raman spectroscopy (Figure 1d) and Fouriertransform infrared (FT-IR) spectroscopy (Figure 1e).…”

“…With the introduction of boron impurities, for 1-BDD, 3-BDD, and 5-BDD, only a peak at 1290 cm −1 that was gradually becoming stronger was present, which corresponded to a single phonon absorption peak of boron impurity in diamond. 40,42,43 We compared the Raman spectra of diamond and graphite (Figure S3). The lattice of diamond is a tetrahedral structure, and the carbon atoms in the lattice are combined with each other by sp 3 bonds, so the Raman characteristic peak of diamond appears at 1330 cm −1 .…”

Synthesis and nitrogen content regulation of diamond in a high-pressure hydrogen-rich environment

“…Diamond, as a material with extreme functional properties, is widely used for various industrial applications, including abrasives and cutting tools, while large-sized diamond single crystals have an even broader range of applications. [1][2][3][4][5][6][7] Particularly, they are used in aerospace infrared windows, high-end wiredrawing dies, precision machining tools, highend camera filters, and other fields. [8][9][10][11][12] At present, the fabrication of high-end diamond products has attracted the attention of the scientific community, and diamond-based materials are regarded as strategic materials for any country.…”