Raman, Dilatometric, and Dielectric Insights into Pr3+-Doped Pb–Sb Silicate Glasses toward Ion-Conducting Glass Electrolytes
Year: 2025
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide This work reports new physical insights concerning the effect of red lead (Pb 3 O 4 ) addition (10–35 mol %) on the structural, dilatometric, dielectric, and conductivity properties of Sb 2 O 3 –SiO 2:Pr 2 O 3 glasses for potential solid-state electrolyte applications. The melt-quenched glasses were scrutinized via Raman spectroscopy including a temperature-dependent evaluation revealing progressive polymerization of the glass network up to 30 mol % Pb 3 O 4, followed by depolymerization at 35 mol %. Harmonizing with the structural evolution, thermal analysis by dilatometry showed that the thermal expansion coefficients/softening temperatures first decreased/increased from 10 to 30 mol % Pb 3 O 4 and then increased/decreased for 35 mol % Pb 3 O 4 . The dielectric properties and ac conductivity were measured over 0.02–1 MHz and 20–240 °C. An increase in Pb 3 O 4 from 10 to 30 mol % led to reduced dielectric constant and conductivity, which is attributed to a more compact and polymerized structure that limits ion mobility. Here, conduction is primarily polaronic, supported by mixed-valence Pb 2+ /Pb 4+ and Sb 3+ /Sb 5+ ions. At 35 mol % Pb 3 O 4, network depolymerization introduced nonbridging oxygens and structural disorder, enhancing the free volume and ion migration pathways. Consequently, ionic conduction, particularly of Pb 2+, becomes dominant, significantly boosting the conductivity. Although Pb 2+ ions are relatively immobile compared to Li + or Na +, the insights gained offer a foundational understanding and guide the development of similar glass systems doped with lighter and more mobile alkali ions for practical battery applications.
Language: English
Subfield: Ceramics and Composites
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Funder: Ministry of Education, India
OpenAlex ID: W4414413900