Crystalline Structure, Defect Chemistry and Room Temperature Colossal Permittivity of Nd-doped Barium Titanate

Dielectric materials with high permittivity are strongly demanded for various technological applications. While polarization inherently exists in ferroelectric barium titanate (BaTiO 3 ), its high permittivity can only be achieved by chemical and/or structural modification. Here, we report the room-...

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Bibliographic Details
Published in:Scientific reports 2017-02, Vol.7 (1), p.42274-42274, Article 42274
Main Authors: Sun, Qiaomei, Gu, Qilin, Zhu, Kongjun, Jin, Rongying, Liu, Jinsong, Wang, Jing, Qiu, Jinhao
Format: Article
Language:English
Subjects:
140/133
140/146
639/301/357/995
639/925/357/354
Aeronautics
Asymmetry
Barium
Ceramics
Chemical composition
Chemistry
Defects
Dielectric properties
Grain size
Humanities and Social Sciences
multidisciplinary
Nanocrystals
Nanoparticles
Particle size
Plasma sintering
Polarization
Science
Symmetry
Temperature effects
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Summary:Dielectric materials with high permittivity are strongly demanded for various technological applications. While polarization inherently exists in ferroelectric barium titanate (BaTiO 3 ), its high permittivity can only be achieved by chemical and/or structural modification. Here, we report the room-temperature colossal permittivity (~760,000) obtained in x Nd: BaTiO 3 ( x  = 0.5 mol%) ceramics derived from the counterpart nanoparticles followed by conventional pressureless sintering process. Through the systematic analysis of chemical composition, crystalline structure and defect chemistry, the substitution mechanism involving the occupation of Nd 3+ in Ba 2+ -site associated with the generation of Ba vacancies and oxygen vacancies for charge compensation has been firstly demonstrated. The present study serves as a precedent and fundamental step toward further improvement of the permittivity of BaTiO 3 -based ceramics.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep42274