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Study of the Non-Isothermal Crystallization Kinetics of Lithium Disilicate Glass Ceramic

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The glass ceramic with the crystals of lithium disilicate Li2O · 2SiO2 (LS2) as the main crystal phase is one of the prospective materials in the field of restorative dentistry. In this study, the crystallization kinetics of LS2 glass ceramic obtained from the base glass of the system SiO2–Li2O–Al2O3–K2O–P2O5 were investigated by the non-isothermal method using differential thermal analysis at four different heating rates. The DTA curves showed different exothermic crystallization peaks over the temperature ranges of 645–683 and 807–845°C. The lithium metasilicate, Li2O · SiO2 (LS), and the lithium disilicate, crystallized over these respective temperature ranges, was established by XRD technique. The crystallization kinetic parameters were calculated by the Kissinger plot and Augis-Bennett equations for non-isothermal analysis. The calculated activation energy of crystal growth, EC1= 236 kJ/mol, EC2 = 340 kJ/mol, and the Avrami parameters, n1 = 1.46–1.67, n2 = 2.73–2.91, together with the results from SEM observations, indicated that the crystallization mechanism of LS was substantial surface crystallization while the crystallization mechanism of LS2 was dominant bulk crystallization. The calculated activation energy of glass transition was also determined EV = 516 kJ/mol.

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ACKNOWLEDGMENTS

HNM would like to acknowledge Ho Chi Minh City University of Technology, Vietnam National University—HCMC for providing a doctoral scholarship for her Ph.D. study.

The authors thank Asst. Prof. Duangrudee Chaysuwan and her students (KU) and Dr. Nguyen Xuan Thanh Tram (HCMUT) for the enthusiastic help in HNM’s short-term visit at Dept of Materials Engineering, Faculty of Engineering Kasetsart University, Thailand.

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Authors and Affiliations

  1. Faculty of Materials Technology, Ho Chi Minh City University of Technology, 70000, Ho Chi Minh, Vietnam

    Huynh Ngoc Minh & Do Quang Minh

  2. Sai Gon University, 72000, Ho Chi Minh, Viet Nam

    Bui Xuan Vuong

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  1. Huynh Ngoc Minh
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  2. Bui Xuan Vuong
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  3. Do Quang Minh
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Correspondence to Huynh Ngoc Minh.

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Huynh Ngoc Minh, Vuong, B.X. & Minh, D.Q. Study of the Non-Isothermal Crystallization Kinetics of Lithium Disilicate Glass Ceramic. Glass Phys Chem 44, 524–530 (2018). https://doi.org/10.1134/S108765961901005X

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