Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8208192 | Results in Physics | 2018 | 12 Pages |
Abstract
Temperature-dependent electron paramagnetic resonance (EPR) study was employed to detect oxygen vacancy defects in the tetragonal Ba(Ti1âxCrx)O3 (xâ¯=â¯5%) ceramic for the first time. In the rhombohedral phase below â150â¯Â°C, an EPR signal at gâ¯=â¯1.955 appeared in the insulating Ba(Ti1âxCrx)O3 (xâ¯=â¯5%) ceramic with an electrical resistivity of 108â¯Î©â¯cm and was assigned to ionized oxygen vacancy defects. Ba(Ti1âxCrx)O3 ceramics exhibited a tetragonal structure except Ba(Ti1âxCrx)O3 (xâ¯=â¯10%) with a tetragonal-hexagonal mixed phase and a first-order phase transition dielectric behavior (εâ²mâ¯>â¯11,000). Mixed valence Cr ions could coexist in ceramics, form CrTiâ²-VO or CrTi-TiTiâ² defect complexes and make no contribution to a dielectric peak shift towards low temperature.
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Physical Sciences and Engineering
Physics and Astronomy
Physics and Astronomy (General)
Authors
Dan-Dan Han, Da-Yong Lu, Fan-Ling Meng, Xin-Yu Yu,