CRYSTALLISATION BEHAVIOUR AND MICROSTRUCTURE OF ErF3 NANOCRYSTALS IN AN OXYFLUORIDE GLASS
The crystallisation of ErF3 nanocrystals in oxyfluoride glass with the composition 55SiO2.20Al2O3.15Na2O.10ErF3 (mol%) was observed after heat treatment above the glass transition temperature. The crystallisation mechanism of this glass was substantiated by microstructural and compositional changes...
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| Veröffentlicht in: | Ceramics international 2013, Vol.39 (6), p.6107-6112 |
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| container_title | Ceramics international |
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| creator | Mallik, A Pal, B Kundu, P Basumajumdar, A |
| description | The crystallisation of ErF3 nanocrystals in oxyfluoride glass with the composition 55SiO2.20Al2O3.15Na2O.10ErF3 (mol%) was observed after heat treatment above the glass transition temperature. The crystallisation mechanism of this glass was substantiated by microstructural and compositional changes in the crystalline phase. Investigations, using dilatometry, XRD, TEM and DSC, showed that a maximum crystal size of 20 nm was obtained after varying the heat treatment time and temperature. TEM images of the as-annealed glass before heat treatment showed no phase separation after quenching the melt. However, after heat treatment for 10 h at 620 C, ordered regions of dark contrast (0.5 nm) with respect to the matrix appeared. These regions are believed to be associated with the onset of nucleation of the fluorite phase. |
| doi_str_mv | 10.1016/j.ceramint.2013.01.028 |
| format | Article |
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The crystallisation mechanism of this glass was substantiated by microstructural and compositional changes in the crystalline phase. Investigations, using dilatometry, XRD, TEM and DSC, showed that a maximum crystal size of 20 nm was obtained after varying the heat treatment time and temperature. TEM images of the as-annealed glass before heat treatment showed no phase separation after quenching the melt. However, after heat treatment for 10 h at 620 C, ordered regions of dark contrast (0.5 nm) with respect to the matrix appeared. These regions are believed to be associated with the onset of nucleation of the fluorite phase.</description><identifier>ISSN: 0272-8842</identifier><identifier>DOI: 10.1016/j.ceramint.2013.01.028</identifier><language>eng</language><subject>Crystallization ; Glass ; Heat treatment ; Microstructure ; Nanocrystals ; Oxyfluorides ; Transmission electron microscopy</subject><ispartof>Ceramics international, 2013, Vol.39 (6), p.6107-6112</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,4024,27923,27924,27925</link.rule.ids></links><search><creatorcontrib>Mallik, A</creatorcontrib><creatorcontrib>Pal, B</creatorcontrib><creatorcontrib>Kundu, P</creatorcontrib><creatorcontrib>Basumajumdar, A</creatorcontrib><title>CRYSTALLISATION BEHAVIOUR AND MICROSTRUCTURE OF ErF3 NANOCRYSTALS IN AN OXYFLUORIDE GLASS</title><title>Ceramics international</title><description>The crystallisation of ErF3 nanocrystals in oxyfluoride glass with the composition 55SiO2.20Al2O3.15Na2O.10ErF3 (mol%) was observed after heat treatment above the glass transition temperature. The crystallisation mechanism of this glass was substantiated by microstructural and compositional changes in the crystalline phase. Investigations, using dilatometry, XRD, TEM and DSC, showed that a maximum crystal size of 20 nm was obtained after varying the heat treatment time and temperature. TEM images of the as-annealed glass before heat treatment showed no phase separation after quenching the melt. However, after heat treatment for 10 h at 620 C, ordered regions of dark contrast (0.5 nm) with respect to the matrix appeared. 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The crystallisation mechanism of this glass was substantiated by microstructural and compositional changes in the crystalline phase. Investigations, using dilatometry, XRD, TEM and DSC, showed that a maximum crystal size of 20 nm was obtained after varying the heat treatment time and temperature. TEM images of the as-annealed glass before heat treatment showed no phase separation after quenching the melt. However, after heat treatment for 10 h at 620 C, ordered regions of dark contrast (0.5 nm) with respect to the matrix appeared. These regions are believed to be associated with the onset of nucleation of the fluorite phase.</abstract><doi>10.1016/j.ceramint.2013.01.028</doi><tpages>6</tpages></addata></record> |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | Crystallization Glass Heat treatment Microstructure Nanocrystals Oxyfluorides Transmission electron microscopy |
| title | CRYSTALLISATION BEHAVIOUR AND MICROSTRUCTURE OF ErF3 NANOCRYSTALS IN AN OXYFLUORIDE GLASS |
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