About this Abstract |
Meeting |
Materials Science & Technology 2020
|
Symposium
|
Additive Manufacturing of Ceramics and Ceramic Composites: Materials Properties, Processes, and Modeling
|
Presentation Title |
Fundamental Studies of Tritium Diffusivity in Irradiation Defective LiAlO2 and Li2ZrO3: A Frist Principles Density Function Theory Study |
Author(s) |
Hari Paudel, Yuhua Duan |
On-Site Speaker (Planned) |
Yuhua Duan |
Abstract Scope |
Li containing ceramics have been in the center of study in Li ion batteries and tritium science and technology as breeding blanket materials for tritium (T) breeding components in the deuterium-tritium (D-T) fusion reactor. The thermal neutron irradiation of lithium isotope (6Li) in tritium (T) -producing burnable absorber rods (TPBARS) of LiAlO2 and Li2ZrO3 crystal produces vacancies, defects of its constituent elements, and several different trapping sites which hinder tritium diffusion process and releasing behavior. Here we investigate the diffusion mechanisms of tritium and OT species in pure and carbon doped LiAlO2 ceramic pellet in order to understand and quantify the effects on diffusion barriers and diffusion coefficients due to the presence of interstitial and substitutional Li defects, hydroxide (O-T) vacancy defect, and the interactions of T with O-vacancies. We also present diffusion of T in pure Li2ZrO3. |