Exploring the energy storage density in 60Bi2O3–10SrO-30Fe2O3 lead-free relaxor glass for designing energy storage devices

Strontium doped glass was synthesized by the conventional melt-quenching technique. Systematically measured dielectric properties revealed relaxor ferroelectric-like behavior in a broad range of frequency and temperature. The glassy nature of the present sample was investigated by X-ray diffraction (XRD) measurements. glass transition temperature, crystallization temperatures and melting temperature are determined by differential thermal analysis (DTA). The low frequency Raman spectra displays a Boson peak at 72 cm ⁻¹ , which confirms polar clusters (PCs) formation. The present sample depicts a wide as well as diffuse peak of dielectric permittivity ε`(ω) and tangent loss tan δ. wide as well as diffuse peak shifted to the higher temperatures (from 538 K to 553 K), a typical relaxor behavior is indicated by this type of diffuse transition. The presence of polar clusters (PCs) imbedded in the glass matrix indicates the presence of relaxor ferroelectric (RFE) behavior in this glass. The measured energy storage density of the strontium doped glass was 4 mJ.cm ⁻³ with efficiency of 70% under an applied electric field of 17 kV.cm ⁻¹ at room temperature. Magnetic properties via vibrating-sample magnetometer (VSM) show a typical anti-ferromagnetic behavior. These results depict that the present glass can be regarded a promising candidate for designing energy storage devices.