Journal
CERAMICS INTERNATIONAL
Volume 43, Issue 12, Pages 8898-8904Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.04.026
Keywords
Glass-ceramic; Breakdown strength; Energy-storage density; Discharge efficiency
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Funding
- Ministry of Sciences and Technology of China through National Basic Research Program of China (973 Program) [2015CB654601]
- China Postdoctoral Science Foundation [2015M581660]
- Guizhou Normal University
- National Natural Science Foundation of China [61604087]
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The SrO-Na2O-Nb2O5-SiO2 (SNNS) glass-ceramics were prepared through the melt-quenching combined with the controlled crystallization technique. XRD results showed Sr6Nb10O30, SrNb2O6, NaSr2Nb5O15 with tungsten bronze structure and NaNbO3 with the perovskite structure. With the decrease of crystallization temperature, dielectric constant firstly increased and then decreased, while breakdown strength (BDS) was increased. High BDS of the glass-ceramics is attributed to the dense and uniform microstructure at low crystallization temperature. The optimal dielectric constant of 140 +/- at 900 degrees C and BDS of 2182 +/- 129 kV/cm at 750 degrees C were obtained in SNNS glass-ceramics. The theoretical energy-storage density was significantly improved up to the highest value of 15.2 +/- 1.0 J/cm(3) at 800 degrees C, which is about 5 times than that at 950 degrees C. The discharged efficiency increased from 65.8% at 950 degrees C to 93.6% at 750 degrees C under the electric field of 500 kV/cm by decreasing crystallization temperature.
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