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Crystallization and microstructural evolution of MgO–Al2O3–SiO2–TiO2–La2O3 glass-ceramics

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ABSTRACT

Crystallization 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 La2O3 concentrations. 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.

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Authors and Affiliations

  1. Key Laboratory of Inorganic Functional Material and Device, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, People’s Republic of China

    Hui-Juan Wang, Bo-Tao Li, Hui-Xing Lin & Lan Luo

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Hui-Juan Wang

  3. Otto-Schott-Institut, Universität Jena, 07743, Jena, Germany

    Hui-Juan Wang, Tilman Zscheckel, Christian Bocker & Christian Rüssel

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  1. Hui-Juan Wang
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Wang, HJ., Zscheckel, T., Li, BT. et al. Crystallization and microstructural evolution of MgO–Al2O3–SiO2–TiO2–La2O3 glass-ceramics. J Mater Sci 52, 1330–1347 (2017). https://doi.org/10.1007/s10853-016-0428-0

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