Thermally induced amorphous to amorphous transition in hot-compressed silica glass

Michael Guerette, Michael R. Ackerson, Jay Thomas, E. Bruce Watson, Liping Huang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In situ Raman and Brillouin light scattering techniques were used to study thermally induced high-density amorphous (HDA) to low-density amorphous (LDA) transition in silica glass densified in hot compression (up to 8 GPa at 1100 °C). Hot-compressed silica samples are shown to retain structural and mechanical stability through 600 °C or greater, with reduced sensitivity in elastic response to temperature as compared with pristine silica glass. Given sufficient thermal energy to overcome the energy barrier, the compacted structure of the HDA silica reverts back to the LDA state. The onset temperature for the HDA to LDA transition depends on the degree of densification during hot compression, commencing at lower temperatures for samples with higher density, but all finishing within a temperature range of 250-300 °C. Our studies show that the HDA to LDA transition at high temperatures in hot-compressed samples is different from the gradual changes starting from room temperature in cold-compressed silica glass, indicating greater structural homogeneity achieved by hot compression. Furthermore, the structure and properties of hot-compressed silica glass change continuously during the thermally induced HDA to LDA transition, in contrast to the abrupt and first-order-like polyamorphic transitions in amorphous ice. Different HDA to LDA transition mechanisms in amorphous silica and amorphous ice are explained by their different energy landscapes.

Original languageEnglish (US)
Article number194501
JournalJournal of Chemical Physics
Volume148
Issue number19
DOIs
StatePublished - May 21 2018

Fingerprint

silica glass
Fused silica
Hot pressing
Silicon Dioxide
silicon dioxide
Ice
ice
Temperature
Brillouin scattering
structural stability
densification
Mechanical stability
thermal energy
Energy barriers
homogeneity
temperature
Thermal energy
Densification
Light scattering
light scattering

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Thermally induced amorphous to amorphous transition in hot-compressed silica glass. / Guerette, Michael; Ackerson, Michael R.; Thomas, Jay; Watson, E. Bruce; Huang, Liping.

In: Journal of Chemical Physics, Vol. 148, No. 19, 194501, 21.05.2018.

Research output: Contribution to journalArticle

Guerette, Michael ; Ackerson, Michael R. ; Thomas, Jay ; Watson, E. Bruce ; Huang, Liping. / Thermally induced amorphous to amorphous transition in hot-compressed silica glass. In: Journal of Chemical Physics. 2018 ; Vol. 148, No. 19.
@article{b1babb1f99854e728844d0e17cdf56dc,
title = "Thermally induced amorphous to amorphous transition in hot-compressed silica glass",
abstract = "In situ Raman and Brillouin light scattering techniques were used to study thermally induced high-density amorphous (HDA) to low-density amorphous (LDA) transition in silica glass densified in hot compression (up to 8 GPa at 1100 °C). Hot-compressed silica samples are shown to retain structural and mechanical stability through 600 °C or greater, with reduced sensitivity in elastic response to temperature as compared with pristine silica glass. Given sufficient thermal energy to overcome the energy barrier, the compacted structure of the HDA silica reverts back to the LDA state. The onset temperature for the HDA to LDA transition depends on the degree of densification during hot compression, commencing at lower temperatures for samples with higher density, but all finishing within a temperature range of 250-300 °C. Our studies show that the HDA to LDA transition at high temperatures in hot-compressed samples is different from the gradual changes starting from room temperature in cold-compressed silica glass, indicating greater structural homogeneity achieved by hot compression. Furthermore, the structure and properties of hot-compressed silica glass change continuously during the thermally induced HDA to LDA transition, in contrast to the abrupt and first-order-like polyamorphic transitions in amorphous ice. Different HDA to LDA transition mechanisms in amorphous silica and amorphous ice are explained by their different energy landscapes.",
author = "Michael Guerette and Ackerson, {Michael R.} and Jay Thomas and Watson, {E. Bruce} and Liping Huang",
year = "2018",
month = "5",
day = "21",
doi = "10.1063/1.5025592",
language = "English (US)",
volume = "148",
journal = "Journal of Chemical Physics",
issn = "0021-9606",
publisher = "American Institute of Physics Publising LLC",
number = "19",

}

TY - JOUR

T1 - Thermally induced amorphous to amorphous transition in hot-compressed silica glass

AU - Guerette, Michael

AU - Ackerson, Michael R.

AU - Thomas, Jay

AU - Watson, E. Bruce

AU - Huang, Liping

PY - 2018/5/21

Y1 - 2018/5/21

N2 - In situ Raman and Brillouin light scattering techniques were used to study thermally induced high-density amorphous (HDA) to low-density amorphous (LDA) transition in silica glass densified in hot compression (up to 8 GPa at 1100 °C). Hot-compressed silica samples are shown to retain structural and mechanical stability through 600 °C or greater, with reduced sensitivity in elastic response to temperature as compared with pristine silica glass. Given sufficient thermal energy to overcome the energy barrier, the compacted structure of the HDA silica reverts back to the LDA state. The onset temperature for the HDA to LDA transition depends on the degree of densification during hot compression, commencing at lower temperatures for samples with higher density, but all finishing within a temperature range of 250-300 °C. Our studies show that the HDA to LDA transition at high temperatures in hot-compressed samples is different from the gradual changes starting from room temperature in cold-compressed silica glass, indicating greater structural homogeneity achieved by hot compression. Furthermore, the structure and properties of hot-compressed silica glass change continuously during the thermally induced HDA to LDA transition, in contrast to the abrupt and first-order-like polyamorphic transitions in amorphous ice. Different HDA to LDA transition mechanisms in amorphous silica and amorphous ice are explained by their different energy landscapes.

AB - In situ Raman and Brillouin light scattering techniques were used to study thermally induced high-density amorphous (HDA) to low-density amorphous (LDA) transition in silica glass densified in hot compression (up to 8 GPa at 1100 °C). Hot-compressed silica samples are shown to retain structural and mechanical stability through 600 °C or greater, with reduced sensitivity in elastic response to temperature as compared with pristine silica glass. Given sufficient thermal energy to overcome the energy barrier, the compacted structure of the HDA silica reverts back to the LDA state. The onset temperature for the HDA to LDA transition depends on the degree of densification during hot compression, commencing at lower temperatures for samples with higher density, but all finishing within a temperature range of 250-300 °C. Our studies show that the HDA to LDA transition at high temperatures in hot-compressed samples is different from the gradual changes starting from room temperature in cold-compressed silica glass, indicating greater structural homogeneity achieved by hot compression. Furthermore, the structure and properties of hot-compressed silica glass change continuously during the thermally induced HDA to LDA transition, in contrast to the abrupt and first-order-like polyamorphic transitions in amorphous ice. Different HDA to LDA transition mechanisms in amorphous silica and amorphous ice are explained by their different energy landscapes.

UR - http://www.scopus.com/inward/record.url?scp=85047246194&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85047246194&partnerID=8YFLogxK

U2 - 10.1063/1.5025592

DO - 10.1063/1.5025592

M3 - Article

VL - 148

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 19

M1 - 194501

ER -