37 research outputs found
Ground state of superheavy elements with : systematic study of the electron-correlation, Breit, and QED effects
For superheavy elements with atomic numbers , the concept
of the ground-state configuration is being reexamined. To this end,
relativistic calculations of the electronic structure of the low-lying levels
are carried out by means of the Dirac-Fock and configuration-interaction
methods.The magnetic and retardation parts of the Breit interaction as well as
the QED effects are taken into account. The influence of the relativistic, QED,
and electron-electron correlation effects on the determination of the
ground-state is analyzed
Hot Pressing of Ho2O3 and Dy2O3 Based Magneto-Optical Ceramics
The paper presents results of a research on fabrication of magneto-optical ceramics based on Ho2O3 and Dy2O3 sesquioxides. The ceramics were made by hot pressing of powders prepared by self-propagating high-temperature synthesis. The methods and modes of the powder treatment developed made it possible to significantly increase the thickness of the ceramics without deterioration in optical quality in comparison with the samples obtained by vacuum sintering. The characteristics of the ceramics, such as transmission spectrum, thermal conductivity, linear thermal expansion coefficient, microhardness, elastic modulus, and crack resistance have been investigated. © 2021 The Author(s).The study was funded by the Russian Science Foundation, research project No. 18-13-00355, https://rscf.ru/en/project/18-13-00355