Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
V
Cr
by photoemission spectroscopyHaruyama, Yuichi*; Teraoka, Yuden; Matsui, Shinji*
no journal, ,
In this study, we have investigated the chemical composition and the electronic structure near surface region in the ternary transition metal alloy TiVCr by means of photoemission spectroscopy. The photoemission spectra in TiVCr were measured as a function of annealing temperature and photon energy. With increasing annealing temperature, the intensity originating from Ti increased. This indicates that the redistribution of the constituent transition metals was caused by the annealing. From the photon energy dependence of the energy distribution curves and constant initial state spectra in the 3p-3d resonant photoemission region of each transition metal, the orbital character of the observed features in the valence band region was clarified.
Haruyama, Yuichi*; Teraoka, Yuden; Matsui, Shinji*
no journal, ,
An alloy of TiVCr system is a solid-sulution type three elements alloy with a BCC crystal structure. It is known as a hydrogen storage material. The amount of hydrogen storage is about 2.3w%. It is relatively larger comparing to that of other hydrogen storage metals. Prior to hydrogen storage, an initial activation process is needed to change its surface atomic structure. We performed inner-shell photoemission spectroscopy, balence band photoemission spectroscopy, and X-ray absorption near-edge spectroscopy measurements to study an electronic structure and effects of hydrogen absorption in a hydrogen storage alloy such as the TiVCr. Furthermore, thermal annealing effects of them were investigated. With increasing thermal anneal temperature, photoemission intensity of Ti increased comparing to V and Cr. This fact implies that Ti segregates near surface by thermal annealing.
Hasegawa, Takayuki*; Uemura, Masaharu*; Takueuchi, Kazuki*; Kodaka, Takuya*; Fukada, Noboru*; Umesaki, Norimasa*; Fukushima, Sei*; Teraoka, Yuden; Haruyama, Yuichi*; Niibe, Masahito*; et al.
no journal, ,
no abstracts in English