New Insight on Surface Effects of Ceramic Breeder Materials by Means of Work Function Measurement

Atsushi Suzuki; Tomoya Hirosawa; Kenji Yamaguchi; Michio Yamawaki

doi:dx.doi.org/10.13182/FST98-A11963725

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New Insight on Surface Effects of Ceramic Breeder Materials by Means of Work Function Measurement

Atsushi Suzuki, Tomoya Hirosawa, Kenji Yamaguchi, Michio Yamawaki

Fusion Science and Technology / Volume 34 / Number 3P2 / November 1998 / Pages 887-891

Fusion Blanket and Shield Technology (Poster Session) / dx.doi.org/10.13182/FST98-A11963725

Published:February 8, 2018

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The work function change of Li₄SiO₄ and Li₂TiO₃ were measured in atmosphere of various gas compositions with a high temperature Kelvin probe. The work function change of Li₄SiO₄ was found to be composed of two steps: one was caused by the formation of oxygen vacancies and the other corresponding to the population change of OH⁻ at the surface. While, a single step of the work function change was observed for Li₂TiO₃. That was attributed to the adsorption/desorption processes at the surface. It was suggested that oxygen vacancies are formed in near-surface bulk of Li₄SiO₄, it is not in the case for Li₂TiO₃.