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Structure and electrical properties of IrO2-doped 0.5Ba0.7Ca0.3TiO3–0.5BaTi0.8Zr0.2O3 ceramics via low-temperature sintering

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Abstract

Lead-free ceramics 0.5Ba0.7Ca0.3TiO3–0.5BaTi0.8Zr0.2O3–xIrO2 (x = 0–1.2 %) were prepared at a low temperature of 1260 °C via sintering the as-synthesized nanoparticles, which were synthesized by a modified Pechini polymeric precursor method. All samples featured high levels of densification under the synthesis conditions; particularly, the ceramic prepared at IrO2 content of 0.4 % achieved the highest relative density (~97.4 %). Phase transition from tetragonal to orthorhombic and a polymorphic phase transition (PPT) region were observed, which were influenced by the IrO2 content. The dielectric properties, temperature coefficient of capacitance, ferroelectric properties, and piezoelectric properties as a function of IrO2 content were thoroughly studied. Optimal electrical properties (remnant polarization, piezoelectric constant, and planar electromechanical coupling factors, i.e., P r = 6.28 μC/cm2, d 33 = 199 pC/N, and k p = 0.258) were obtained around the PPT region. The findings of the ceramic electrical properties by IrO2 doping are believed to be insightful in the development of lead-free dielectric and ferroelectric materials.

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Acknowledgements

The work was supported by Fundamental Research Funds for National University (CUG120118), State Key Laboratory of Advanced Technology for Materials Synthesis Processing (Wuhan University of Technology, 2012-KF-3). The authors express sincere thanks to Dr. Hongquan Wang for FESEM measurements.

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Authors and Affiliations

  1. Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan, 430074, People’s Republic of China

    Yongshang Tian, Yansheng Gong, Dawei Meng & Yuanjian Li

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  1. Yongshang Tian
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  2. Yansheng Gong
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Correspondence to Yansheng Gong or Dawei Meng.

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Tian, Y., Gong, Y., Meng, D. et al. Structure and electrical properties of IrO2-doped 0.5Ba0.7Ca0.3TiO3–0.5BaTi0.8Zr0.2O3 ceramics via low-temperature sintering. J Mater Sci 50, 6134–6141 (2015). https://doi.org/10.1007/s10853-015-9170-2

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