Effect of rare-earth additions on the structure and dielectric energy storage properties of BaxSr1-xTiO3-based barium boronaluminosilicate glass-ceramics

• A certain content of Yb2O3 can restrain the formation of BaSi2O5and SiO2 phases.
• The addition of rare earth can optimize the microstructure.
• With 0.5 mol% Yb3+, the dielectric energy storage density got the largest value of 3.5 J/cm3.

BaxSr1-xTiO3-based barium boroaluminosilicate (BST-BBAS) glass-ceramics added with La2O3, Gd2O3 and Yb2O3 were fabricated through the melting method followed by controlled crystallization, respectively. The X-ray diffraction and the field emission scanning electron microscopy were investigated the phase composition and microstructure for the BST-BBAS glass-ceramics added with rare-earth additions, then the temperature-dependent dielectric properties and the voltage-withstand measurements were applied to study the effect of rare-earth additions on the dielectric energy storage density. These results show that the certain content of rare-earth additions can optimize the microstructure and phase structure effectively. And with the decrease of ionic radiuses of rare-earth elements, the microstructure of the glass-ceramics become more uniform. When added with 0.5 mol% Yb3+, the theoretical energy storage density of the BST-BBAS glass-ceramics gets the largest value of 3.5 J/cm3 which is about 1.8 times compared to the undoped one.