11. Česko-Slovenská studentská vědecká konference ve fyzice (ČSSVK2020)

Phase stability of actinide carbides

18 Sept 2020, 11:00

15m

Teoretická fyzika Teoretická fyzika

Speaker

Mr Jakub Oprštěný (VSB-TU Ostrava)

Description

Electronic, structural, mechanical, magnetic and thermodynamical properties of uranium and thorium sesquicarbides (${\text{U}}_2{\text{C}}_3$ and ${\text{Th}}_2{\text{C}}_3$ ) were investigated by the means of first principles calculations, with special interest in the effects of $5f$ electrons. Utilized models included various approximations of exchange-correlation electronic terms, spin-orbital interaction (with a major effect on ${\text{U}}_2{\text{C}}_3$ and egligible effect on ${\text{Th}}_2{\text{C}}_3$ ) and Hubbard $U$ model for electronic Coulomb interaction. The magnitude of these effects is demonstrated on the direct comparison of various physical quantities, such as band structure, enthalpy of formation, magnetic ordering, heat capacity, elastic constants, etc. and compared with experimental data.

Presentation materials

opr0019_bp.pdf

opr0019-cssvk2020.pdf