Crystal growth in zinc borosilicate glasses

Ana T G Kullberg; Andreia A. S. Lopes; João P. B. Veiga; Regina C. C. Monteiro

doi:10.1016/j.jcrysgro.2016.07.022

Crystal growth in zinc borosilicate glasses

Ana T G Kullberg, Andreia A. S. Lopes, João P. B. Veiga, Regina C. C. Monteiro

Research output: Contribution to journal › Conference article › peer-review

7 Citations (Scopus)

Abstract

Glass samples with a molar composition (64+x)ZnO–(16−x)B₂O₃–20SiO₂, where x=0 or 1, were successfully synthesized using a melt-quenching technique. Based on differential thermal analysis data, the produced glass samples were submitted to controlled heat-treatments at selected temperatures (610, 615 and 620 °C) during various times ranging from 8 to 30 h. The crystallization of willemite (Zn₂SiO₄) within the glass matrix was confirmed by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). Under specific heat-treatment conditions, transparent nanocomposite glass-ceramics were obtained, as confirmed by UV–vis spectroscopy. The influence of temperature, holding time and glass composition on crystal growth was investigated. The mean crystallite size was determined by image analysis on SEM micrographs. The results indicated an increase on the crystallite size and density with time and temperature. The change of crystallite size with time for the heat-treatments at 615 and 620 °C depended on the glass composition. Under fixed heat-treatment conditions, the crystallite density was comparatively higher for the glass composition with higher ZnO content.

Original language	English
Pages (from-to)	239-243
Number of pages	5
Journal	Journal Of Crystal Growth
Volume	457
Issue number	SI
DOIs	https://doi.org/10.1016/j.jcrysgro.2016.07.022
Publication status	Published - Jan 2017
Event	5th European Conference for Crystal Growth (ECCG5) - Bologna, Italy Duration: 9 Sept 2015 → 9 Nov 2015 Conference number: 5th

Keywords

Crystal morphology
Growth from melt
Glasses
Oxides
Zinc compounds

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title = "Crystal growth in zinc borosilicate glasses",

abstract = "Glass samples with a molar composition (64+x)ZnO–(16−x)B2O3–20SiO2, where x=0 or 1, were successfully synthesized using a melt-quenching technique. Based on differential thermal analysis data, the produced glass samples were submitted to controlled heat-treatments at selected temperatures (610, 615 and 620 °C) during various times ranging from 8 to 30 h. The crystallization of willemite (Zn2SiO4) within the glass matrix was confirmed by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). Under specific heat-treatment conditions, transparent nanocomposite glass-ceramics were obtained, as confirmed by UV–vis spectroscopy. The influence of temperature, holding time and glass composition on crystal growth was investigated. The mean crystallite size was determined by image analysis on SEM micrographs. The results indicated an increase on the crystallite size and density with time and temperature. The change of crystallite size with time for the heat-treatments at 615 and 620 °C depended on the glass composition. Under fixed heat-treatment conditions, the crystallite density was comparatively higher for the glass composition with higher ZnO content.",

keywords = "Crystal morphology, Growth from melt, Glasses, Oxides, Zinc compounds",

author = "Kullberg, {Ana T G} and Lopes, {Andreia A. S.} and Veiga, {Jo{\~a}o P. B.} and Monteiro, {Regina C. C.}",

note = "The authors thank the Foundation for Science and Technology, Portugal, for financing M-ERA.NET/0010/2012 and UID/CTM/ 500025/2013 projects.; 5th European Conference for Crystal Growth (ECCG5), ECCG5 ; Conference date: 09-09-2015 Through 09-11-2015",

year = "2017",

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doi = "10.1016/j.jcrysgro.2016.07.022",

language = "English",

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AU - Kullberg, Ana T G

AU - Lopes, Andreia A. S.

AU - Veiga, João P. B.

AU - Monteiro, Regina C. C.

N1 - Conference code: 5th

PY - 2017/1

Y1 - 2017/1

N2 - Glass samples with a molar composition (64+x)ZnO–(16−x)B2O3–20SiO2, where x=0 or 1, were successfully synthesized using a melt-quenching technique. Based on differential thermal analysis data, the produced glass samples were submitted to controlled heat-treatments at selected temperatures (610, 615 and 620 °C) during various times ranging from 8 to 30 h. The crystallization of willemite (Zn2SiO4) within the glass matrix was confirmed by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). Under specific heat-treatment conditions, transparent nanocomposite glass-ceramics were obtained, as confirmed by UV–vis spectroscopy. The influence of temperature, holding time and glass composition on crystal growth was investigated. The mean crystallite size was determined by image analysis on SEM micrographs. The results indicated an increase on the crystallite size and density with time and temperature. The change of crystallite size with time for the heat-treatments at 615 and 620 °C depended on the glass composition. Under fixed heat-treatment conditions, the crystallite density was comparatively higher for the glass composition with higher ZnO content.

AB - Glass samples with a molar composition (64+x)ZnO–(16−x)B2O3–20SiO2, where x=0 or 1, were successfully synthesized using a melt-quenching technique. Based on differential thermal analysis data, the produced glass samples were submitted to controlled heat-treatments at selected temperatures (610, 615 and 620 °C) during various times ranging from 8 to 30 h. The crystallization of willemite (Zn2SiO4) within the glass matrix was confirmed by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). Under specific heat-treatment conditions, transparent nanocomposite glass-ceramics were obtained, as confirmed by UV–vis spectroscopy. The influence of temperature, holding time and glass composition on crystal growth was investigated. The mean crystallite size was determined by image analysis on SEM micrographs. The results indicated an increase on the crystallite size and density with time and temperature. The change of crystallite size with time for the heat-treatments at 615 and 620 °C depended on the glass composition. Under fixed heat-treatment conditions, the crystallite density was comparatively higher for the glass composition with higher ZnO content.

KW - Crystal morphology

KW - Growth from melt

KW - Glasses

KW - Oxides

KW - Zinc compounds

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ER -

Crystal growth in zinc borosilicate glasses

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Keywords

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