期刊
SCRIPTA MATERIALIA
卷 221, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2022.114993
关键词
Alkali -free; Glass -ceramics; Ultralow dielectric loss; High discharge energy density
类别
资金
- Ministry of Sciences and Technology of China through the 973 -project [2015CB654601]
The study investigates the effect of different (Sr, Ba)/Nb ratios on the properties of SrO-BaO-Nb2O5-SiO2 glass-ceramics. It was found that changes in phase composition and microstructure led to fluctuations in dielectric constant and breakdown strength, with the optimal sample (S5) achieving a discharge energy density of 1.14 J/cm3.
The SrO-BaO-Nb2O5-SiO2 glass-ceramics with different (Sr, Ba)/Nb ratio were prepared by the meltingcrystallized process. With the decrease of (Sr, Ba)/Nb, the bonding species and crystallization activation energy of the glass-ceramics were changed obviously, which caused the change of phase compositions and microstructures on a microscopic scale and the fluctuations of dielectric constant and breakdown strength on a macroscopic scale. Finally, the theoretical energy storage density was up to 18.93 J/cm3 with a dielectric constant of 84 and breakdown strength of 2256.73 kV/cm. What is more, the dielectric loss was less than 0.004 at room temperature. Furthermore, under the electric field of 640 kV/cm the discharge energy density of the optimal sample (S5) reached 1.14 J/cm3 which overtopped what has been reported and the discharge time (t0.9) was less than 16 ns. Above analysis suggested that the alkali-free niobate-based glass-ceramics have broad application prospects.
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