[en] The vapor pressures and work function changes of Li₄SiO₄, Li₂ZrO₃, Li₂TiO₃, as well as Li₂O at elevated temperatures were measured to investigate their thermochemical behavior. Application of two independent experimental techniques made it possible to understand such behavior from both macroscopic and microscopic standpoints. The experimentally obtained results of vapor pressures and work function changes were closely related to each other, indicating some relevance between macroscopic and microscopic behaviors of hydrogen at the surface of ceramic breeders