A Novel Electron Paramagnetic Resonance Phenomenon in a Barium Stronium Titanate Ceramic

Abstract:

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 (Ba_0.85Sr_0.15)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.

• Periodical: Advanced Materials Research (Volumes 295-297)
• Pages: 1050-1054
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.295-297.1050
• Online since: July 2011
• Authors: Da Yong Lu, Xiu Yun Sun
• Keywords: Barium Stronium Titanate, Dielectric Property, EPR, g-Tensor, Point Defect

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