Temperature-dependent electron paramagnetic resonance detect oxygen vacancy defects and Cr valence of tetragonal Ba(Ti1−xCrx)O3 ceramics

Temperature-dependent electron paramagnetic resonance detect oxygen vacancy defects and Cr valence of tetragonal Ba(Ti1−xCrx)O3 ceramics

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%)...

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Main Authors: Dan-Dan Han, Da-Yong Lu, Fan-Ling Meng, Xin-Yu Yu
Format: Article
Language:English
Published: Elsevier 2018-03-01
Series:Results in Physics
Online Access:http://www.sciencedirect.com/science/article/pii/S2211379717318545
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spelling doaj-868a56d5858641368067375c8af5bd552020-11-24T20:45:12ZengElsevierResults in Physics2211-37972018-03-018190193Temperature-dependent electron paramagnetic resonance detect oxygen vacancy defects and Cr valence of tetragonal Ba(Ti1−xCrx)O3 ceramicsDan-Dan Han0Da-Yong Lu1Fan-Ling Meng2Xin-Yu Yu3School of Materials Science and Engineering, Jilin University, Changchun 130012, PR China; Research Center for Materials Science and Engineering, Jilin Institute of Chemical Technology, Jilin 132022, PR ChinaResearch Center for Materials Science and Engineering, Jilin Institute of Chemical Technology, Jilin 132022, PR China; Corresponding authors.School of Materials Science and Engineering, Jilin University, Changchun 130012, PR China; Corresponding authors.Research Center for Materials Science and Engineering, Jilin Institute of Chemical Technology, Jilin 132022, PR ChinaTemperature-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. Keywords: Ceramics, Structural, Defects, Dielectricshttp://www.sciencedirect.com/science/article/pii/S2211379717318545
collection DOAJ
language English
format Article
sources DOAJ
author Dan-Dan Han
Da-Yong Lu
Fan-Ling Meng
Xin-Yu Yu
spellingShingle Dan-Dan Han
Da-Yong Lu
Fan-Ling Meng
Xin-Yu Yu
Temperature-dependent electron paramagnetic resonance detect oxygen vacancy defects and Cr valence of tetragonal Ba(Ti1−xCrx)O3 ceramics
Results in Physics
author_facet Dan-Dan Han
Da-Yong Lu
Fan-Ling Meng
Xin-Yu Yu
author_sort Dan-Dan Han
title Temperature-dependent electron paramagnetic resonance detect oxygen vacancy defects and Cr valence of tetragonal Ba(Ti1−xCrx)O3 ceramics
title_short Temperature-dependent electron paramagnetic resonance detect oxygen vacancy defects and Cr valence of tetragonal Ba(Ti1−xCrx)O3 ceramics
title_full Temperature-dependent electron paramagnetic resonance detect oxygen vacancy defects and Cr valence of tetragonal Ba(Ti1−xCrx)O3 ceramics
title_fullStr Temperature-dependent electron paramagnetic resonance detect oxygen vacancy defects and Cr valence of tetragonal Ba(Ti1−xCrx)O3 ceramics
title_full_unstemmed Temperature-dependent electron paramagnetic resonance detect oxygen vacancy defects and Cr valence of tetragonal Ba(Ti1−xCrx)O3 ceramics
title_sort temperature-dependent electron paramagnetic resonance detect oxygen vacancy defects and cr valence of tetragonal ba(ti1−xcrx)o3 ceramics
publisher Elsevier
series Results in Physics
issn 2211-3797
publishDate 2018-03-01
description 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. Keywords: Ceramics, Structural, Defects, Dielectrics
url http://www.sciencedirect.com/science/article/pii/S2211379717318545
work_keys_str_mv AT dandanhan temperaturedependentelectronparamagneticresonancedetectoxygenvacancydefectsandcrvalenceoftetragonalbati1xcrxo3ceramics
AT dayonglu temperaturedependentelectronparamagneticresonancedetectoxygenvacancydefectsandcrvalenceoftetragonalbati1xcrxo3ceramics
AT fanlingmeng temperaturedependentelectronparamagneticresonancedetectoxygenvacancydefectsandcrvalenceoftetragonalbati1xcrxo3ceramics
AT xinyuyu temperaturedependentelectronparamagneticresonancedetectoxygenvacancydefectsandcrvalenceoftetragonalbati1xcrxo3ceramics
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