title: Hydrogen Absorption of Palladium Thin Films Observed by in Situ Transmission Electron Microscopy with an Environmental Cell.
abstract: A window type of the environmental cell system for a high-voltage electron microscope was developed and applied to in situ observation of a palladium (Pd) thin film. For in situ hydrogenation of Pd thin films, the distances of the lattice fringes were 0.20 and 0.23 nm, which correspond to the lattice d spacings of β-phase (200) and (111) planes. Expansion of the Pd lattice happened as a result of phase transformation from the α phase to the β phase. In particular, the lattice fringes were clearly distinguished, and the dislocation behavior during Pd hydrogenation was easily recognized according to the corresponding inverse fast fourier transform images. Furthermore, significant growth in the number of dislocations was observed at the grain boundary during increasing hydrogen pressure in the cell.
authors.affiliation: Graduate School of Engineering, Hokkaido University , N-13, W-8, Sapporo 060-8628, Japan.
authors.forename: Tengfei
authors.initials: T
authors.lastname: Zhang
authors.affiliation: Graduate School of Engineering, Hokkaido University , N-13, W-8, Sapporo 060-8628, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Nakagawa
authors.affiliation: Graduate School of Engineering, Hokkaido University , N-13, W-8, Sapporo 060-8628, Japan.
authors.forename: Takenobu
authors.initials: T
authors.lastname: Wakasugi
authors.affiliation: Graduate School of Engineering, Hokkaido University , N-13, W-8, Sapporo 060-8628, Japan.
authors.forename: Shigehito
authors.initials: S
authors.lastname: Isobe
authors.affiliation: Creative Research Institution, Hokkaido University , N-21, W-10, Sapporo 001-0021, Japan.
authors.forename: Yongming
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Graduate School of Engineering, Hokkaido University , N-13, W-8, Sapporo 060-8628, Japan.
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Hashimoto
authors.affiliation: Graduate School of Engineering, Hokkaido University , N-13, W-8, Sapporo 060-8628, Japan.
authors.forename: Somei
authors.initials: S
authors.lastname: Ohnuki
keywords: Pd catalysis; dislocation; environmental cell; hydrogenation; thin film