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<p>Bi<sub>(1–2/3x)</sub>Sr<sub>x</sub>VO<sub>4</sub>–TiO<sub>2</sub> (x = 0, 0.1, 0.15) composite materials were prepared by the conventional solid state reaction method at optimized temperature of 750&#xa0;°C. The effect of Strontium (Sr) element in the stoichiometric system of BiVO<sub>4</sub>–TiO<sub>2</sub> on structural phase, micro-morphology, elemental composition, band energy and dielectric properties were systematically analyzed for the first time. All the composite materials synthesized with different concentrations of Sr have two structural phases, monoclinic structure which belongs to BiVO<sub>4</sub> whereas tetragonal structure belongs to the rutile TiO<sub>2</sub>. The relative dielectric permittivity (ɛ<sub>r</sub>) gradually increased from ~ 61 to 122 with the increase of Sr concentration in the Bi<sub>(1–2/3x)</sub>Sr<sub>x</sub>VO<sub>4</sub>–TiO<sub>2</sub> (x = 0, 0.1, 0.15) composite. The temperature dependent ac electrical conductivity (σ<sub>ac</sub>) of the prepared materials was estimated in the frequency range from 50 to 3&#xa0;MHz. The estimated microwave dielectric permittivity (ɛ<sub>r</sub>) gradually increased from ~ 68 to 77 and decreased the temperature co-efficient of resonant frequency (TCF) from − 134 to − 110 at 3.9&#xa0;GHz with the increase of Sr concentration in the Bi<sub>(1–2/3x)</sub>Sr<sub>x</sub>VO<sub>4</sub>–TiO<sub>2</sub> (x = 0, 0.1, 0.15). Results were discussed in detail for their potential dielectric applications.</p>

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Enlightening the effect of strontium in the BiVO4–TiO2 diphase composites for dielectric devices

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • K. Yukesh Kumar,
  • N. Sivakumar,
  • G. M. Bhalerao,
  • G. Anbalagan,
  • Kentaro Tashiro,
  • Ali Alsulmi

摘要

Bi(1–2/3x)SrxVO4–TiO2 (x = 0, 0.1, 0.15) composite materials were prepared by the conventional solid state reaction method at optimized temperature of 750 °C. The effect of Strontium (Sr) element in the stoichiometric system of BiVO4–TiO2 on structural phase, micro-morphology, elemental composition, band energy and dielectric properties were systematically analyzed for the first time. All the composite materials synthesized with different concentrations of Sr have two structural phases, monoclinic structure which belongs to BiVO4 whereas tetragonal structure belongs to the rutile TiO2. The relative dielectric permittivity (ɛr) gradually increased from ~ 61 to 122 with the increase of Sr concentration in the Bi(1–2/3x)SrxVO4–TiO2 (x = 0, 0.1, 0.15) composite. The temperature dependent ac electrical conductivity (σac) of the prepared materials was estimated in the frequency range from 50 to 3 MHz. The estimated microwave dielectric permittivity (ɛr) gradually increased from ~ 68 to 77 and decreased the temperature co-efficient of resonant frequency (TCF) from − 134 to − 110 at 3.9 GHz with the increase of Sr concentration in the Bi(1–2/3x)SrxVO4–TiO2 (x = 0, 0.1, 0.15). Results were discussed in detail for their potential dielectric applications.