Electron Spin Resonances in Reduced BaTiO_3

概要

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Electron spin resonances of reduced BaTi0_2 were observed in X band at 77°K and 55°K. The paramagnetic centers in the crystals reduced at temperatures between 650°C and 1000°C have three equivalent sites, each of which shows tetragonal symmetry. The g tensor is axial symmetric: g〃= 1,930 an g⊥=1,911. Spin-lattice relaxation time is of the order of 1O^<-6>s at 55°K. Resonance of impurity Pt^<3+> disappears in the crystals reduced at above 650℃. These facts indicate that the center observed is an F-center surrounded by two Ti^<4+> and four Ba^<2+> ions. Another kind of complex centers appear in the crystals reduced at 1100℃. The origin of these centers, however, has not been analyzed yet. With the crystals reduced at 1300℃, the two kinds of centers mentioned above completely vanish. This is due to purge of electron traps.
社団法人日本物理学会の論文
1966-02-05