Dielectric properties of (Bi0.5Nb0.5)xTi1-xO2 ceramics with colossal permittivity

The (Bi0.5Nb0.5)xTi1-xO2 (BNTO, 0 ≤ x ≤ 0.05) ceramics were synthesized by a standard conventional solid-state reaction. The effects of sintering temperature and composition x on the crystal structure, microstructure, and dielectric properties of BNTO ceramics were investigated. A pure rutile phase...

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Bibliographic Details
Published in:Journal of alloys and compounds 2017-10, Vol.722, p.676-682
Main Authors: Song, Yuechan, Liu, Peng, Zhao, Xiaogang, Guo, Baochun, Cui, Xiulei
Format: Article
Language:English
Subjects:
Ceramic
Ceramics
Colossal permittivity
Composition effects
Crystal structure
Dielectric
Dielectric loss
Dielectric properties
Dielectric strength
Dielectrics
Microstructure
Permittivity
Rutile TiO2
Titanium oxides
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Summary:The (Bi0.5Nb0.5)xTi1-xO2 (BNTO, 0 ≤ x ≤ 0.05) ceramics were synthesized by a standard conventional solid-state reaction. The effects of sintering temperature and composition x on the crystal structure, microstructure, and dielectric properties of BNTO ceramics were investigated. A pure rutile phase is achieved as x ≤ 0.01, and secondary phase Bi1.74Ti2O6.624 is detected as x ≥ 0.025. BNTO ceramic with x = 0.025 shows a high dielectric constant (155.1 k) and low dielectric loss (0.042) at 1 kHz (room temperature). Colossal permittivity is primarily related to Maxwell-Wagner effect, electron-pinned defect-dipoles or weak-binding electron. The low dielectric loss is argued to Bi ions which are doped into TiO2 lattice and the formation of Bi1.74Ti2O6.624 phase. •Sintering temperature and x have huge influence on dielectric properties of BNTO.•This work indicates that Bi3+ may be conducive to dielectric properties of BNTO.•Some Bi3+ ions substitute for Ti4+ sites and enter the TiO2 lattice.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2017.06.177