Crystallization kinetics, structure and dielectric properties of CaO–B2O3–SiO2 glass–ceramics nucleated by composite nucleating agents
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The crystallization kinetics, structure and dielectric properties of CaO-B2O3–SiO2 (CBS) glass–ceramics, nucleated by composite nucleating agents (TiO2, ZrO2), are systematically investigated. The results reveal that the addition of composite nucleating agent (TiO2/ZrO2) destroyed the continuity of the glass network structure formed by SiO2 and B2O3, promoted the precipitation of wollastonite phase and enhanced the dielectric properties of as-prepared CBS glass–ceramics. However, the composite nucleating agent increased the crystallization temperature of the glass and introduced some impurity phases, influencing the microscopic arrangement of the wollastonite phase, whereas the content of impurity phases decreased with the increase of TiO2 content in the composite nucleating agent. Furthermore, the crystallization kinetics study showed that the composite nucleating agent reduced the crystallization activation energy of glass, and the crystallization of glass is controlled by one-dimensional interfacial crystal growth.
This study was funded by the National Natural Science Foundation of China (Grant No. 51534001).
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