Thermal, electrical, and dielectric properties of xNa2O-(0.4-x)B2O3-0.4SiO2-0.2P2O5 glassy systems for advanced material applications

• Published in: Journal of alloys and compounds 2025-01, Vol.1010, p.177878, Article 177878
• Main Authors: Biswas, Dipankar, Rakshit, Ashes, Hota, Souvik Brahma, Kabi, Soumyajyoti, Kuiri, Bibhatsu, Roy, Debasish, Mondal, Rittwick
• Format: Article
• Language: English
• Subjects: AC and DC conductivity; Dielectric relaxation process; Impedance spectroscopy; Quaternary glass; Thermal stability; XRD
• ISSN: 0925-8388
• DOI: 10.1016/j.jallcom.2024.177878

This study investigates the xNa2O–(0.4-x)B2O3–0.4SiO2–0.2 P2O5 glassy system (NBSP) with Na2O content ranging from x = 0.10 to 0.25, synthesized using melt-quenching techniques. The effects of varying Na2O concentrations on the glass’s structural, thermal, and electrical properties are systematically analysed. Increasing Na2O content leads to a decrease in glass density. Concurrently, the molar volume increases, reflecting an expansion of the glass network. X-ray diffraction (XRD) and scanning electron microscopy (SEM) shows the formation of crystallites inside the glass matrix. XRD analysis reveals a decrease in crystallite size and increased microstrain with higher Na2O concentrations. Thermal stability remains relatively stable with a slight decrease in glass transition temperature, making the glasses suitable for high-temperature applications. Electrical conductivity studies show increased conductivity with higher Na2O content. The dielectric loss and dielectric constant increase with temperature but decrease at higher frequencies. Analysis using the Kohlrausch–Williams–Wats model shows that the charge carriers exhibit non-Debye-type relaxation behaviour. Impedance spectroscopy confirms that higher Na2O concentrations enhance ionic conduction with lower bulk resistance. It is suggested that glasses with higher Na2O content, especially x = 0.20 and x = 0.25, are promising for energy storage applications due to their enhanced ionic mobility and favorable electrical properties. •The study explores xNa2O–(0.4-x)B2O3–0.4SiO2–0.2 P2O5 glasses prepared via melt quenching.•Electrical property has been analyzed employing several theoretical models.•Increasing Na2O content enhances both AC and DC conductivity.•Ions and polarons take part in charge conduction process.•Glasses show potential as electrodes in energy storage, combining high conductivity with stable dielectric behavior.