A Novel Electron Paramagnetic Resonance Phenomenon in a Barium Stronium Titanate Ceramic
The electron paramagnetic resonance (EPR) technique was employed to investigate the point defects in barium strontium titanate ceramics. All samples showed a strong EPR signal with g = 2.000, which was indexed as intrinsic Ti-vacancy defects. In (Ba0.85Sr0.15)TiO3 ceramic, which showed a tetragonal symmetry and consisted of the crystallites with average size of ~ 220 nm, a novel EPR powder spectrum was observed - the g-factor of the g = 2.000 signal evolved into a g-tensor, and the two weak signals with g3 = ~ 2.6 and g1 = ~ 1.6 gradually shifted toward the g2 = 2.000 signal and approached to each other with increasing temperature.
Pengcheng Wang, Liqun Ai, Yungang Li, Xiaoming Sang and Jinglong Bu
D. Y. Lu and X. Y. Sun, "A Novel Electron Paramagnetic Resonance Phenomenon in a Barium Stronium Titanate Ceramic", Advanced Materials Research, Vols. 295-297, pp. 1050-1054, 2011