Abstract
The CaO–B2O3–SiO2 (CBS) glasses with addition of xLa2O3 (0 ≤ x ≤ 20 wt%) were prepared by conventional quenching method, the glass structure, phase transformation and microware dielectric properties were studied. The glass structure analysis by magic angle spinning nuclear magnetic resonance (MAS-NMR) and infrared (IR) spectroscopy indicated that [BO4] transformed into [BO3] and the proportion of Si–O–Si bridge oxygen bond in [SiO4] tetrahedrons decreased obviously with the addition of La2O3. The differential thermal analysis (DTA) revealed that the CBS glass system kept better glass-forming ability and the transition temperature (T g) decreased from 743 to 724 °C after addition of La2O3. As the content of La2O3 increases, the crystallization tendency of CaB2O4 is suppressed, while that for Ca2SiO4 is promoted. With appropriate content of La2O3 (5 wt%), the sample possess excellent dielectric properties (ε r ≈ 4.1, tanδ ≈ 1.7 × 10−3 at 15 GHz). The variations of dielectric properties are believed to be appreciably associated with the relative content of the phases present.
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Acknowledgements
The structure testing was supported by National Center for Magnetic Resonance in Wuhan and Southwest University of Science and Technology. The authors appreciate the financial support from the fund of the State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals (No. SKL-SPM-201535, 201548), the 551 project of Kunming, the Basic Applied Research Foundation (No. 2016FD125, 2016FB083) and Science &Technology Program (NO. 2014DC019) of Yunnan Province.
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Xiang, Y., Han, J., Lai, Y. et al. Glass structure, phase transformation and microwave dielectric properties of CaO–B2O3–SiO2 glass–ceramics with addition of La2O3 . J Mater Sci: Mater Electron 28, 9911–9918 (2017). https://doi.org/10.1007/s10854-017-6746-4
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DOI: https://doi.org/10.1007/s10854-017-6746-4