Effect of ZnF2 addition on the crystallization behaviour of a zinc borosilicate glass

A. T. G. Kullberg, A. A. S. Lopes, Regina C. C. Monteiro

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A series of zinc borosilicate glasses with a molar composition (65-x) ZnO-x ZnF2-15B(2)O(3)-20SiO(2), where x ranged from 0 to 5 mol%, were prepared by a melt quenching technique. The effect of zinc fluoride (ZnF2) substitution for ZnO on the structural, thermal and crystallization features of the glasses was investigated. Structural information via vibration modes was provided by FTIR analysis that revealed an increased band definition and intensity for the highest content of ZnF2. The incorporation of F- ions caused the Si-O-Si bond breakage and appearance of non-bridging oxygens in the network. DTA results indicated that ZnF2 addition decreased slightly the onset and peak crystallization temperatures, lowering the thermal stability of the glasses. XRD analysis of glasses heat-treated at 615 C revealed the formation of willemite (Zn2SiO4) crystals, which was enhanced in glasses containing the highest ZnF2 addition. Microstructural observations by SEM of heat-treated glasses confirmed that the amount and the mean size of willemite crystals precipitated within the glass matrix increased with the addition of ZnF2, which acted as a crystallization promoting agent.
Original languageEnglish
Pages (from-to)100-104
Number of pages5
JournalJournal of Non-Crystalline Solids
Volume468
DOIs
Publication statusPublished - 15 Jul 2017

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Borosilicate glass
borosilicate glass
Crystallization
Zinc
zinc
crystallization
Glass
glass
zinc fluorides
heat
Crystals
Differential thermal analysis
crystals
Quenching
vibration mode
thermal analysis
Thermodynamic stability
Substitution reactions
thermal stability
quenching

Keywords

  • Borosilicate glasses
  • Glass crystallization
  • Willemite crystals
  • Zinc fluoride

Cite this

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title = "Effect of ZnF2 addition on the crystallization behaviour of a zinc borosilicate glass",
abstract = "A series of zinc borosilicate glasses with a molar composition (65-x) ZnO-x ZnF2-15B(2)O(3)-20SiO(2), where x ranged from 0 to 5 mol{\%}, were prepared by a melt quenching technique. The effect of zinc fluoride (ZnF2) substitution for ZnO on the structural, thermal and crystallization features of the glasses was investigated. Structural information via vibration modes was provided by FTIR analysis that revealed an increased band definition and intensity for the highest content of ZnF2. The incorporation of F- ions caused the Si-O-Si bond breakage and appearance of non-bridging oxygens in the network. DTA results indicated that ZnF2 addition decreased slightly the onset and peak crystallization temperatures, lowering the thermal stability of the glasses. XRD analysis of glasses heat-treated at 615 C revealed the formation of willemite (Zn2SiO4) crystals, which was enhanced in glasses containing the highest ZnF2 addition. Microstructural observations by SEM of heat-treated glasses confirmed that the amount and the mean size of willemite crystals precipitated within the glass matrix increased with the addition of ZnF2, which acted as a crystallization promoting agent.",
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note = "This work is funded by FEDER funds through the COMPETE 2020 Programme and National Funds through FCT - Portuguese Foundation for Science and Technology under the project UID/CTM/50025/2013, and by the project M-ERA.NET/0010/2012.",
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Effect of ZnF2 addition on the crystallization behaviour of a zinc borosilicate glass. / Kullberg, A. T. G.; Lopes, A. A. S.; Monteiro, Regina C. C.

In: Journal of Non-Crystalline Solids, Vol. 468, 15.07.2017, p. 100-104.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of ZnF2 addition on the crystallization behaviour of a zinc borosilicate glass

AU - Kullberg, A. T. G.

AU - Lopes, A. A. S.

AU - Monteiro, Regina C. C.

N1 - This work is funded by FEDER funds through the COMPETE 2020 Programme and National Funds through FCT - Portuguese Foundation for Science and Technology under the project UID/CTM/50025/2013, and by the project M-ERA.NET/0010/2012.

PY - 2017/7/15

Y1 - 2017/7/15

N2 - A series of zinc borosilicate glasses with a molar composition (65-x) ZnO-x ZnF2-15B(2)O(3)-20SiO(2), where x ranged from 0 to 5 mol%, were prepared by a melt quenching technique. The effect of zinc fluoride (ZnF2) substitution for ZnO on the structural, thermal and crystallization features of the glasses was investigated. Structural information via vibration modes was provided by FTIR analysis that revealed an increased band definition and intensity for the highest content of ZnF2. The incorporation of F- ions caused the Si-O-Si bond breakage and appearance of non-bridging oxygens in the network. DTA results indicated that ZnF2 addition decreased slightly the onset and peak crystallization temperatures, lowering the thermal stability of the glasses. XRD analysis of glasses heat-treated at 615 C revealed the formation of willemite (Zn2SiO4) crystals, which was enhanced in glasses containing the highest ZnF2 addition. Microstructural observations by SEM of heat-treated glasses confirmed that the amount and the mean size of willemite crystals precipitated within the glass matrix increased with the addition of ZnF2, which acted as a crystallization promoting agent.

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