Publications by authors named "Keiga Fukui"
Te thin films have recently received considerable attention owing to its superior electrical and thermoelectric properties. During the deposition process, if the temperature of the substrate is raised, high crystallinity and improved electrical properties can be expected. In this study, we used radio frequency sputtering for Te deposition to study the relationship between the deposition temperature, crystal size, and electrical performance.
View Article and Find Full Text PDFThe hydride ion (H) is a unique anionic species that exhibits high reactivity and chemical energy. H conductors are key materials to utilize advantages of H for applications, such as chemical reactors and energy storage systems. However, low H conductivity at room temperature (RT) in current H conductors limit their applications.
View Article and Find Full Text PDFArticle Synopsis
- Fast ionic conductors, particularly those involving hydride ions (H), are important for advancing technologies in energy storage and conversion due to their properties like natural abundance and light mass.
- The study focuses on oxygen-doped LaH (LaHO), which exhibits the highest reported ionic conductivity for H at intermediate temperatures, measured at 2.6 × 10 S cm.
- The findings indicate that while the activation energy remains stable, the remarkable decrease in the pre-exponential factor is linked to the temperature-dependent enthalpy of H when influenced by lanthanum ions and oxygen, highlighting the role of H's properties and the crystal structure in facilitating fast ionic conduction.