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Crystallization and microstructural evolution of MgO–Al2O3–SiO2–TiO2–La2O3glass-ceramics
Wang, Hui-Juan1,2,3; Zscheckel, Tilman3; Li, Bo-Tao1; Lin, Hui-Xing1; Bocker, Christian3; Rüssel, Christian3; Luo, Lan1
2017
Source PublicationJournal of Materials Science
ISSN00222461
Volume52Issue:3Pages:1330-1347
AbstractCrystallization and microstructure of glasses with the molar compositions 1MgO·1.2Al2O3·2.8SiO2·1.2TiO2·xLa2O3(x = 0.1 and 0.4) were thermally treated at different temperatures in the range from 950 to 1250 °C and then analyzed by X-ray diffraction and scanning electron microscopy, in combination with energy-dispersive X-ray spectroscopy and electron backscatter diffraction. It was found that the microstructure is first homogeneous with the precipitation of randomly distributed crystals and then indialite domains with embedded perrierite and rutile crystals are formed. For higher temperatures or prolonged times, more domains appear and expand into the bulk of the sample. Finally, the entire sample consists of the indialite domains and the boundaries that are enriched in rutile, perrierite, and magnesium aluminotitanate. Nevertheless, very distinct differences are observed between the samples with different La2O3concentrations. For the sample with x = 0.4, the domains were detected at lower temperatures, while the quantity and size of the domains increase faster due to the promoted precipitation of indialite. For the sample with x = 0.1, in addition to the domain boundaries, secondary boundaries between the “regions” (assemblages of the domains) are observed in a larger length scale. The average size of the crystalline phases found between the “regions” is larger than that typically observed at the domain boundaries. The sizes of the crystals at the boundaries decrease with higher concentrations of La2O3, and the crystals (especially perrierite) within the domains become larger, resulting in a more homogeneous microstructure. This results in better dielectric properties, i.e., much higher quality factor for the sample with x = 0.4 in comparison to that with x = 0.1 after heat-treatment at 1150 or 1250 °C. © 2016, Springer Science+Business Media New York.
DOI10.1007/s10853-016-0428-0
EI Accession Number20164202925879
EI KeywordsCrystal microstructure
EI Classification Number482.2 Minerals - 804 Chemical Products Generally - 804.2 Inorganic Compounds - 931.2 Physical Properties of Gases, Liquids and Solids - 933.1.1 Crystal Lattice
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Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/25639
Collection中国科学院上海硅酸盐研究所
Affiliation1.Key Laboratory of Inorganic Functional Material and Device, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai; 200050, China;
2.University of Chinese Academy of Sciences, Beijing; 100049, China;
3.Otto-Schott-Institut, Universität Jena, Jena; 07743, Germany
Recommended Citation
GB/T 7714
Wang, Hui-Juan,Zscheckel, Tilman,Li, Bo-Tao,等. Crystallization and microstructural evolution of MgO–Al2O3–SiO2–TiO2–La2O3glass-ceramics[J]. Journal of Materials Science,2017,52(3):1330-1347.
APA Wang, Hui-Juan.,Zscheckel, Tilman.,Li, Bo-Tao.,Lin, Hui-Xing.,Bocker, Christian.,...&Luo, Lan.(2017).Crystallization and microstructural evolution of MgO–Al2O3–SiO2–TiO2–La2O3glass-ceramics.Journal of Materials Science,52(3),1330-1347.
MLA Wang, Hui-Juan,et al."Crystallization and microstructural evolution of MgO–Al2O3–SiO2–TiO2–La2O3glass-ceramics".Journal of Materials Science 52.3(2017):1330-1347.
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