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

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.

Recent advances in rare earth co-doped luminescent tungsten oxygen complexes

Rare earth (RE) materials have been employed in almost every corner of modern industry, such as lighting application, defense technology, industrial catalysis and so on. Particularly, RE-based tungsten oxygen complexes...

Фосфоресценция кислорода при возбуждении на длине волны 765 nm

— The phosphorescence of oxygen in the liquid phase and in a solution in carbon tetrachloride was studied upon excitation at a wavelength of 765 nm using an LED array as a source of direct optical excitation. A comparison is made of the observed efficiency of oxygen phosphorescence at a wavelength of 1270 nm upon its excitation at a wavelength of 765 nm with its excitation at other wavelengths, which partially or completely coincide with the absorption lines of molecular oxygen complexes. Key words: phosphorescence, singlet oxygen, molecular complexes, optical excitation, LED matrices.

Linear free energy relationships for transition metal chemistry: case study of CH activation with copper–oxygen complexes

We propose a computational framework for developing Taft-like linear free energy relationships to characterize steric effects on the catalytic activity of transition metal complexes.

Комбинационное рассеяние света стекловидным тетработатом лития, активированным Tb-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=-

Raman spectra of glassy lithium tetraborate activated with terbium oxide of various concentrations were investigated. Most of the observed structure in the Raman spectra of the Li2B4O7: Tb2O3 glass is due to mixed vibrations of complex boron- and terbium-oxygen complexes which are typical to a superposition of tetragonal Li2В4О7 and cubic Tb2О3 structures.

Фосфоресценция жидкого кислорода при возбуждении на кооперативных переходах в видимой области спектра

The phosphorescence of liquid oxygen were studied upon its excitation at the cooperative transitions of O2-O2 molecular oxygen complexes with using for direct optical excitation of LED matrices with radiation in the near UV and visible spectral regions with wavelengths partially or completely coinciding with the absorption lines of molecular complexes