Presentation Information
[10a-C310-14]Growth Control and High Hydride-ion Conductivity in Strain-Engineered SrLiH3 Epitaxial Films
〇(D)Erika Fukushi1, Nozomi Wada1, Takayuki Harada2, Hiroyuki Oguchi1 (1.Shibaura Tech., 2.NIMS)
Keywords:
Hydrides,Hydride-ion conductor,epitaxial thin film
SrLiH3 is a stable perovskite hydride with negligible electronic conduction, making it a promising hydride-ion conductor. However, higher hydride-ion conductivity is required for device applications. Here, we aimed to enhance hydride-ion conduction in SrLiH3 epitaxial films by introducing lattice strain through interfacial stress. To clarify why films with similar thickness show different conductivities, films with various thicknesses and deposition rates were prepared by radical-hydrogen reactive infrared laser deposition. Their structures were examined by X-ray diffraction and reciprocal space mapping, and their conductivities were evaluated by AC impedance spectroscopy. The results suggest that an unidentified phase forms during initial growth and that the growth state strongly affects conductivity. We discuss the relationship among thickness, deposition rate, strain, and conductivity as a guideline for growth control toward high hydride-ion conduction in stable hydride films.