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<p>Ba<sub>2</sub>FeVO<sub>6</sub>(BFV) double perovskite was synthesized via sol–gel with citrate at 500&#xa0;°C, 700&#xa0;°C, and 900&#xa0;°C to explore phase evolution and multifunctional properties. XRD shows hexagonal R-3c with best crystallinity and phase purity at 900&#xa0;°C. Average crystallite sizes increase from 33.5&#xa0;nm (500&#xa0;°C) to 36.2&#xa0;nm (700&#xa0;°C) and 44.7&#xa0;nm (900&#xa0;°C). BFV700 has the highest <i>ε</i>′ (≈729 at 150&#xa0;°C/0.1 Hz). <i>ε</i>′ increases with temperature, with inflections at 70–90&#xa0;°C indicating vacancy migration and dipolar overlap. BFV500 shows intermediate <i>ε</i>′ (≈294), BFV900 the lowest (≈60) but most stability. Conductivity follows Jonscher’s law; BFV700 shows ~ 10 × higher low-frequency σ than BFV900. Optical band gaps range from 1.98 to 1.99&#xa0;eV (direct) and 1.26 to 1.38&#xa0;eV (indirect). <i>E</i><sub><i>g</i></sub> narrowing at 700&#xa0;°C suggests optimal defect states for photocatalysis. Magnetic hysteresis loops show saturation magnetization dropping from ~ 7.68&#xa0;emu/g at 500&#xa0;°C to ~ 6.8&#xa0;emu/g at 700&#xa0;°C and ~ 1.04 emu/g at 900&#xa0;°C. Coercivity rises from ~ 127 Oe (500&#xa0;°C) to ~ 650 Oe (900&#xa0;°C) as impurity-driven ferrimagnetism gives way to pure, antiferromagnetic coupling. MB adsorption (125&#xa0;mg/g, Langmuir) follows pseudo-second-order kinetics and is exothermic (ΔH° = − 52.56&#xa0;kJ/mol). Data establish clear correlations between sintering temperature and multifunctional properties; identification of BFV700 as optimal demonstrates resolution of research gaps in phase–property mapping and multifunctional performance with potential for energy storage and dye remediation applications.</p>

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Multifunctional evaluation of dielectric, optical, magnetic, and methylene blue adsorption behaviors of Ba2FeVO6 double perovskite

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Ahmed A. Bhran,
  • Rania M. Sabry,
  • M. A. Farag,
  • Abdelrahman G. Gadallah,
  • A. G. Darwish

摘要

Ba2FeVO6(BFV) double perovskite was synthesized via sol–gel with citrate at 500 °C, 700 °C, and 900 °C to explore phase evolution and multifunctional properties. XRD shows hexagonal R-3c with best crystallinity and phase purity at 900 °C. Average crystallite sizes increase from 33.5 nm (500 °C) to 36.2 nm (700 °C) and 44.7 nm (900 °C). BFV700 has the highest ε′ (≈729 at 150 °C/0.1 Hz). ε′ increases with temperature, with inflections at 70–90 °C indicating vacancy migration and dipolar overlap. BFV500 shows intermediate ε′ (≈294), BFV900 the lowest (≈60) but most stability. Conductivity follows Jonscher’s law; BFV700 shows ~ 10 × higher low-frequency σ than BFV900. Optical band gaps range from 1.98 to 1.99 eV (direct) and 1.26 to 1.38 eV (indirect). Eg narrowing at 700 °C suggests optimal defect states for photocatalysis. Magnetic hysteresis loops show saturation magnetization dropping from ~ 7.68 emu/g at 500 °C to ~ 6.8 emu/g at 700 °C and ~ 1.04 emu/g at 900 °C. Coercivity rises from ~ 127 Oe (500 °C) to ~ 650 Oe (900 °C) as impurity-driven ferrimagnetism gives way to pure, antiferromagnetic coupling. MB adsorption (125 mg/g, Langmuir) follows pseudo-second-order kinetics and is exothermic (ΔH° = − 52.56 kJ/mol). Data establish clear correlations between sintering temperature and multifunctional properties; identification of BFV700 as optimal demonstrates resolution of research gaps in phase–property mapping and multifunctional performance with potential for energy storage and dye remediation applications.