Temperature effects on the structure of lead metasilicate glass, supercooled liquid, crystal, and liquid: Vibrational anharmonicity and configurational transformations analyzed by molecular dynamics and Raman scattering

被引：1

作者：

Pizani, P. S. ^{[1
,2
]}

Cunha, T. R. ^{[1
,2
]}

Pena, R. B. ^{[1
,2
]}

Picinin, A. ^{[1
]}

Rodrigues, A. D. ^{[1
]}

Rino, J. P. ^{[1
,2
]}

机构：

[1] Univ Fed Sao Carlos, Phys Dept, BR-13565905 Sao Carlos, SP, Brazil

[2] Univ Fed Sao Carlos, Ctr Res Technol & Educ Vitreous Mat, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2024年 / 636卷

基金：

巴西圣保罗研究基金会;

关键词：

Raman spectroscopy; Molecular Dynamics; Vibrational Anharmonicity; Lead Metasilicate; Temperature Effects on the Structure; SILICATE-GLASSES; SPECTROSCOPY; PRESSURE;

D O I：

10.1016/j.jnoncrysol.2024.122992

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页数：4