کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8208192 1531901 2018 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Temperature-dependent electron paramagnetic resonance detect oxygen vacancy defects and Cr valence of tetragonal Ba(Ti1−xCrx)O3 ceramics
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک و نجوم (عمومی)
پیش نمایش صفحه اول مقاله
Temperature-dependent electron paramagnetic resonance detect oxygen vacancy defects and Cr valence of tetragonal Ba(Ti1−xCrx)O3 ceramics
چکیده انگلیسی
Temperature-dependent electron paramagnetic resonance (EPR) study was employed to detect oxygen vacancy defects in the tetragonal Ba(Ti1−xCrx)O3 (x = 5%) ceramic for the first time. In the rhombohedral phase below −150 °C, an EPR signal at g = 1.955 appeared in the insulating Ba(Ti1−xCrx)O3 (x = 5%) ceramic with an electrical resistivity of 108 Ω cm and was assigned to ionized oxygen vacancy defects. Ba(Ti1−xCrx)O3 ceramics exhibited a tetragonal structure except Ba(Ti1−xCrx)O3 (x = 10%) with a tetragonal-hexagonal mixed phase and a first-order phase transition dielectric behavior (ε′m > 11,000). Mixed valence Cr ions could coexist in ceramics, form CrTi′-VO or CrTi-TiTi′ defect complexes and make no contribution to a dielectric peak shift towards low temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Results in Physics - Volume 8, March 2018, Pages 190-193
نویسندگان
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