Effect of crystallization temperature on dielectric and energy-storage properties in SrO-Na2O-Nb2O5-SiO2 glass-ceramics. Issue 12 (15th August 2017)

• Record Type: Journal Article
• Authors: Wang, Haitao; Liu, Jinhua; Zhai, Jiwei; Shen, Bo; Pan, Zhongbin; Liu, Jing Ran; Yang, Ke
• Is Part Of: Ceramics international. Volume 43:Issue 12(2017)
• Page Start: 8898
• Page End: 8904
• Publication Date: 2017-08-15
• Subjects: Glass-ceramic -- Breakdown strength -- Energy-storage density -- Discharge efficiency; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.04.026
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The SrO-Na2 O-Nb2 O5 -SiO2 (SNNS) glass-ceramics were prepared through the melt-quenching combined with the controlled crystallization technique. XRD results showed Sr6 Nb10 O30, SrNb2 O6, NaSr2 Nb5 O15 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±7 at 900 °C and BDS of 2182±129 kV/cm at 750 °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 °C, which is about 5 times than that at 950 °C. The discharged efficiency increased from 65.8% at 950 °C to 93.6% at 750 °C under the electric field of 500 kV/cm by decreasing crystallization temperature.