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Kitaura, Mamoru*; Fujimori, Kosuke*; Taira, Yoshitaka*; Fujimoto, Masaki*; Zen, H.*; Hirade, Tetsuya; Kamada, Kei*; Watanabe, Shinta*; Onishi, Akimasa*
no journal, ,
Positron annihilation spectroscopy is the only way to investigate the properties of cation vacancies because they are negatively charged. We generated high-energy pulsed gamma rays by the vertical collision of an ultrashort pulse laser and electron beam. In this study, we investigated the vacancy-type defects present in the crystals of GAGG(Gd
Al
GaO
), GAGG: Ce and GAGG: Ce, Mg by positron annihilation lifetime spectroscopy using the high-energy gamma rays. The lifetime of the defect-related component was significantly changed by Mg co-doping. This was understood by considering aggregates of Mg
ions at Al/Ga sites with oxygen vacancies, which resulted in the formation of vacancy clusters.
Yoneda, Yasuhiro; Nakata, Kengo*; Ohara, Koji*
no journal, ,
We analyze real-space fit and inverse Monte Carlo method (RMC) using the same material data and compare the results obtained to characterize each analysis method. We will report the result of barium titanate (BaTiO). BaTiO is one of the substances whose real space fit is very difficult because Ba with high ionicity and Ti with high covalent bond are mixed. We discussed how to extract comparable data from the structural parameters obtained by each analysis method.