Applied Physics A

, Volume 121, Issue 3, pp 1251–1259 | Cite as

Effect of dopants ionic radii on dielectric properties of Bi4V2−xMExO11−δ (where x = 0.0 and 0.15; ME = Mg, Ca, Sr and Ba)

Article

Abstract

Different alkaline earth metals doped Bi4V2−xMExO11−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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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.School of Physics and Materials ScienceThapar UniversityPatialaIndia

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