Microstructure and dielectric properties of (Nb + In) co-doped rutile TiO2 ceramics

Jinglei Li, Fei Li, Yongyong Zhuang, Li Jin, Linghang Wang, Xiaoyong Wei, Zhuo Xu, Shujun Zhang

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Abstract

The (Nb + In) co-doped TiO2 ceramics recently attracted considerable attention due to their colossal dielectric permittivity (CP) (∼ 100,000) and low dielectric loss (∼ 0.05). In this research, the 0.5 mol. % In-only, 0.5 mol. % Nb-only, and 0.5-7 mol. % (Nb + In) co-doped TiO 2 ceramics were synthesized by standard conventional solid-state reaction method. Microstructure studies showed that all samples were in pure rutile phase. The Nb and In ions were homogeneously distributed in the grain and grain boundary. Impedance spectroscopy and I-V behavior analysis demonstrated that the ceramics may compose of semiconducting grains and insulating grain boundaries. The high conductivity of grain was associated with the reduction of Ti4+ ions to Ti3+ ions, while the migration of oxygen vacancy may account for the conductivity of grain boundary. The effects of annealing treatment and bias filed on electrical properties were investigated for co-doped TiO2 ceramics, where the electric behaviors of samples were found to be susceptible to the annealing treatment and bias field. The internal-barrier-layer-capacitance mechanism was used to explain the CP phenomenon, the effect of annealing treatment and nonlinear I-V behavior for co-doped rutile TiO2 ceramics. Compared with CaCu3Ti 4O12 ceramics, the high activation energy of co-doped rutile TiO2 (3.05 eV for grain boundary) was thought to be responsible for the low dielectric loss.

Original languageEnglish (US)
Article number074105
JournalJournal of Applied Physics
Volume116
Issue number7
DOIs
StatePublished - Aug 21 2014

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rutile
dielectric properties
ceramics
microstructure
grain boundaries
dielectric loss
annealing
permittivity
conductivity
ions
barrier layers
capacitance
electrical properties
impedance
activation energy
solid state
oxygen
spectroscopy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Li, J., Li, F., Zhuang, Y., Jin, L., Wang, L., Wei, X., ... Zhang, S. (2014). Microstructure and dielectric properties of (Nb + In) co-doped rutile TiO2 ceramics. Journal of Applied Physics, 116(7), [074105]. https://doi.org/10.1063/1.4893316
Li, Jinglei ; Li, Fei ; Zhuang, Yongyong ; Jin, Li ; Wang, Linghang ; Wei, Xiaoyong ; Xu, Zhuo ; Zhang, Shujun. / Microstructure and dielectric properties of (Nb + In) co-doped rutile TiO2 ceramics. In: Journal of Applied Physics. 2014 ; Vol. 116, No. 7.
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Li, J, Li, F, Zhuang, Y, Jin, L, Wang, L, Wei, X, Xu, Z & Zhang, S 2014, 'Microstructure and dielectric properties of (Nb + In) co-doped rutile TiO2 ceramics', Journal of Applied Physics, vol. 116, no. 7, 074105. https://doi.org/10.1063/1.4893316

Microstructure and dielectric properties of (Nb + In) co-doped rutile TiO2 ceramics. / Li, Jinglei; Li, Fei; Zhuang, Yongyong; Jin, Li; Wang, Linghang; Wei, Xiaoyong; Xu, Zhuo; Zhang, Shujun.

In: Journal of Applied Physics, Vol. 116, No. 7, 074105, 21.08.2014.

Research output: Contribution to journalArticle

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