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Effect of dopants ionic radii on dielectric properties of Bi4V2−x ME x O11−δ (where x = 0.0 and 0.15; ME = Mg, Ca, Sr and Ba)

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Abstract

Different alkaline earth metals doped Bi4V2−x ME x O11−δ (where x = 0.0 and 0.15; ME = Mg, Ca, Sr and Ba) samples are synthesized by melt quench technique followed by heat treatment. The γ-phase is stabilized at room temperature in all the doped samples, whereas undoped sample (x = 0.0) exhibits the α-phase at room temperature. These samples are investigated for their dielectric properties with respect to temperature and frequencies. From the scanning electron micrographs, it is clear that liquid-phase sintering has taken place in all the doped samples. The highest dielectric constant is observed in Bi4V1.85Ca0.15O11−δ sample ~105. The minimum loss is observed in Bi4V1.85Ba0.15O11−δ sample, i.e., ~2.58. The highest optical band gap ~2.42 eV is observed for Bi4V1.85Ca0.15O11−δ sample. The obtained results are discussed in the light of ionic radii, oxygen vacancies and disordering in the samples.

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Acknowledgments

The authors are thankful to Dr. B. N. Chudasama and Ms. Samita Thakur, Thapar University for their help in recording the UV/vis spectra and valuable and consistent guidance. Authors are also thankful to DST for financial help under sanction Order No. SR/S2/CMP-0035/2011 dated 19.01.2012.

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  1. School of Physics and Materials Science, Thapar University, Patiala, Punjab, 147004, India

    Sakshi Gupta & K. Singh

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  1. Sakshi Gupta
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  2. K. Singh
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Correspondence to K. Singh.

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Gupta, S., Singh, K. Effect of dopants ionic radii on dielectric properties of Bi4V2−x ME x O11−δ (where x = 0.0 and 0.15; ME = Mg, Ca, Sr and Ba). Appl. Phys. A 121, 1251–1259 (2015). https://doi.org/10.1007/s00339-015-9498-0

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  • DOI: https://doi.org/10.1007/s00339-015-9498-0

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