Spectra of Eu3+ in various dielectric matrices (Gd2O3:Eu3+, Y2O3:Eu3+, Eu2O3, and mSiO2/Gd2O3:Eu3+mesoporous particles) are studied by local cathodoluminescence. The results allowed identification...

The feasibility of synthesizing gadolinium tantalum niobates by the liquid-phase method was demonstrated. The methods of X-ray diffraction, electron probe microanalysis, local cathodoluminescence, and photoluminescence were applied to study the samples. It was shown that under the selected synthesis conditions (T ~ 1400°C for 3 hours), no solid solution of niobium-tantalum was formed in the powder samples. When obtaining ceramic samples, it was possible to obtain a solid solution and to study the dependence of the luminescence intensity on the niobium content upon excitation of the samples by an electron beam. The maximum luminescence intensity was observed in the sample with the composition of GdNb_0.9Ta_0.1O₄. It was shown that the inhomogeneity of luminescence is not related to fluctuations in composition, but is related to the inhomogeneous distribution of vacancy centers, which are luminescence centers.

The fabrication of a photovoltaic nuclear electric battery consisting of a radioactive diamond core and an InGaP photoconverter is described. An electrical circuit for a nuclear battery has been proposed. A battery core has been manufactured using a polished self-glowing diamond plate made of artificial single-crystal IIb-diamond activated with 0.008 wt. % 14C. The optimal geometric parameters of the proposed diamond plates have been determined, and a prospective photovoltaic converter was developed. The optimal design of the nuclear diamond battery, including possible increase in power yield, is discussed.

In this work, SiO₂ sol-gel glass doped with Eu³⁺ was investigated its structural and luminescence properties. It was shown that a area containing crystallites of cristobalite with a size of about 45 nm is formed on the glass surface. The Eu³⁺ spectrum in surface area was obtained. It was demonstrated that the main part of the sample is X-ray amorphous; however, the Eu³⁺ spectrum in it demonstrates the presence of short-range order.