| Full text | |
| Author(s): |
Pizani, P. S.
;
Cunha, T. R.
;
Pena, R. B.
;
Picinin, A.
;
Rodrigues, A. D.
;
Rino, J. P.
Total Authors: 6
|
| Document type: | Journal article |
| Source: | Journal of Non-Crystalline Solids; v. 636, p. 4-pg., 2024-05-10. |
| Abstract | |
Raman spectroscopy and Molecular Dynamics (MD) simulations were employed to explore in detail the effects of temperature on the four stages of the PbO center dot SiO2 system: glass, supercooled liquid, crystalline phases, and liquid. The Qn distribution up to 1153 K and the wavenumber temperature coefficients derived from vibrational anharmonicity were determined from the Raman data, whereas the structural transformation reflected in changes in the Qn population distribution up to 2400 K was inferred from MD simulations. The results indicate that reversible configurational transformations occur only in the higher temperature ranges of the supercooled liquid and more notably in the liquid state. During these transformations, the increase in the Q0 and Q1 populations occurs at the expense of the Q3 and Q4 populations. On the other hand, only vibrational anharmonicity was observed in the glass and crystalline states. (AU) | |
| FAPESP's process: | 17/11868-2 - Correlation between structure and optical properties of (Äx, A'1-x)O + SiO2(A,A'= Pb,Ni,Co,Cr) glass ceramic serie under high hydrostatic pressure |
| Grantee: | Rafaella Bartz Pena |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |
| FAPESP's process: | 19/12383-8 - Study of structural and vibrational properties of glass and glass-ceramic materials via Raman scattering as a function of temperature and high hydrostatic pressures. |
| Grantee: | Thiago Rodrigues da Cunha |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 21/13974-0 - High-pressure studies in glass silicates |
| Grantee: | Ariano De Giovanni Rodrigues |
| Support Opportunities: | Regular Research Grants |
| 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 |