Crystallization, Dielectric, and Energy Storage Properties of Phosphate Glass–Ceramics

Abstract

Abderrahim Ihyadn, Daoud Mezzane, M’barek Amjoud, Abdelilah Lahmar, Lahcen Bih, Abdelhadi Alimoussa, Igor Luk’yanchuk and Mimoun El Marssi

The BaO-Na2O-Nb2O5-WO3-P2O5 glass-ceramics were synthesized using a melt-quenching technique coupled with a controlled crystallization process. It was found that increasing crystallization temperature promoted the increase of ceramic phases precipitated and the average grains size of glass-ceramics, resulting in the increase of the dielectric constant. The large dielectric constant of 315 was achieved for glass crystallized at 1000°C. In addition, a thermally stable dielectric constant was noticed in the temperature range from 25 °C to 250 °C. Low dielectric losses below 0.04 were obtained for all samples. The recoverable energy density (Wrec) was enhanced as the crystallization temperature increased. The sample heated at 1000°C exhibited a high Wrec of 177mJ/cm3 with an energy efficiency of 73.8% under 120 kV/cm. These results suggest that phosphate glasses based on niobate glass-ceramics are a promising material for pulse capacitors.

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