Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glasses
Differential thermal analysis and scanning electron microscopy were used to determine the influence of the addition of BaO on the crystallization mechanism of Li2O-ZrO2-SiO2 systems. As the concentration of BaO in the samples increased, a transition occurred in the predominant crystallization mechan...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2002-03-01
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| Series: | Materials Research |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392002000100004 |
| _version_ | 1831775373781630976 |
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| author | Cristian Berto da Silveira Sílvia Denofre de Campos Elvio A. de Campos Antônio Pedro Novaes de Oliveira |
| author_facet | Cristian Berto da Silveira Sílvia Denofre de Campos Elvio A. de Campos Antônio Pedro Novaes de Oliveira |
| author_sort | Cristian Berto da Silveira |
| collection | DOAJ |
| description | Differential thermal analysis and scanning electron microscopy were used to determine the influence of the addition of BaO on the crystallization mechanism of Li2O-ZrO2-SiO2 systems. As the concentration of BaO in the samples increased, a transition occurred in the predominant crystallization mechanism, which passed from superficial to volumetric. To determine the maximum nucleation rate, the crystallization kinetics of the sample containing 20 mole % BaO, which showed the most uniform crystallization, was studied by counting the nuclei with an image analyzer. The first nuclei appeared at the first endothermic inflection point (at the start of Tg, at 440 °C), while the maximum number of nuclei was counted at the midpoint of the glass transition region (446 °C). These results are similar to those observed for other materials that crystallize in volume, and confirm scanning electron microscopy data. |
| first_indexed | 2024-12-22T09:12:48Z |
| format | Article |
| id | doaj.art-3e907b1b003043d29a5a8d44c4b81fbb |
| institution | Directory Open Access Journal |
| issn | 1516-1439 |
| language | English |
| last_indexed | 2024-12-22T09:12:48Z |
| publishDate | 2002-03-01 |
| publisher | Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
| record_format | Article |
| series | Materials Research |
| spelling | doaj.art-3e907b1b003043d29a5a8d44c4b81fbb2022-12-21T18:31:23ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392002-03-0151212610.1590/S1516-14392002000100004Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 GlassesCristian Berto da SilveiraSílvia Denofre de CamposElvio A. de CamposAntônio Pedro Novaes de OliveiraDifferential thermal analysis and scanning electron microscopy were used to determine the influence of the addition of BaO on the crystallization mechanism of Li2O-ZrO2-SiO2 systems. As the concentration of BaO in the samples increased, a transition occurred in the predominant crystallization mechanism, which passed from superficial to volumetric. To determine the maximum nucleation rate, the crystallization kinetics of the sample containing 20 mole % BaO, which showed the most uniform crystallization, was studied by counting the nuclei with an image analyzer. The first nuclei appeared at the first endothermic inflection point (at the start of Tg, at 440 °C), while the maximum number of nuclei was counted at the midpoint of the glass transition region (446 °C). These results are similar to those observed for other materials that crystallize in volume, and confirm scanning electron microscopy data.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392002000100004glass ceramicsbarium oxidecrystallizationLi2O-ZrO2-SiO2 glass |
| spellingShingle | Cristian Berto da Silveira Sílvia Denofre de Campos Elvio A. de Campos Antônio Pedro Novaes de Oliveira Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glasses Materials Research glass ceramics barium oxide crystallization Li2O-ZrO2-SiO2 glass |
| title | Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glasses |
| title_full | Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glasses |
| title_fullStr | Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glasses |
| title_full_unstemmed | Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glasses |
| title_short | Crystallization Mechanism and Kinetics of BaO-Li2O-ZrO2-SiO2 Glasses |
| title_sort | crystallization mechanism and kinetics of bao li2o zro2 sio2 glasses |
| topic | glass ceramics barium oxide crystallization Li2O-ZrO2-SiO2 glass |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392002000100004 |
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