| Full text | |
| Author(s): |
Lancelotti, Ricardo F.
;
Chuang, Shih-Yi
;
Zanotto, Edgar D.
;
Sen, Sabyasachi
Total Authors: 4
|
| Document type: | Journal article |
| Source: | ACTA MATERIALIA; v. 285, p. 9-pg., 2024-12-19. |
| Abstract | |
This study investigates the effect of alpha-relaxation induced by physical aging due to a down-jump in fictive temperature (Tf) on the alkali ion hopping dynamics and the resulting ionic conductivity in different network oxide glass-forming systems. Electrochemical impedance spectroscopy, differential scanning calorimetry, and density measurements were used to analyze this effect. Results from ex situ and in situ aging experiments show excellent agreement and demonstrate that alpha-relaxation during aging significantly reduces the ionic conductivity of the glass as its density increases and Tf decreases. In single-alkali Li disilicate and Li metaphosphate glasses, the migration enthalpy Delta Hm of ionic conduction remains constant after aging, while the migration entropy Delta Sm decreases, leading to a corresponding reduction in the hopping rate of mobile alkali ions. In contrast, in the mixed-modifier Na-Mg metaphosphate glass, both Delta Hm and Delta Sm increase after aging. This behavior is potentially explained by a spatial redistribution of Na and Mg cations likely occurring alongside alpha-relaxation during aging. The findings suggest that significant increases in the ionic conductivity of a glass, even by orders of magnitude, can be achieved by raising its Tf. This implies that fast-quenched glass products, such as thin films or fibers, may have novel applications as sensors and solid electrolytes. (AU) | |
| FAPESP's process: | 22/07679-8 - Atomistic origin of structural relaxation in lead metasilicate and lithium disilicate glasses |
| Grantee: | Ricardo Felipe Lancelotti |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass |
| Grantee: | Edgar Dutra Zanotto |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |
| FAPESP's process: | 21/03374-5 - Structural relaxation of glass and its influence on other dynamic processes |
| Grantee: | Ricardo Felipe Lancelotti |
| Support Opportunities: | Scholarships in Brazil - Doctorate |