Effect of SiO₂/Al₂O₃ Ratio on Crystallization and Dielectric Properties of Barium Strontium Titanate Glass-Ceramics

Abstract

The effect of SiO₂/Al₂O₃ ratio on crystallization and dielectric properties of barium strontium titanate (BST) glass-ceramics has been investigated by differential scanning calorimetry (DSC), X-ray diffractometry (XRD), Raman spectrometry, and dielectric measurements. The experimental results showed that appropriate SiO₂/Al₂O₃ ratio promoted the crystallization of a ferroelectric BST phase and improved the dielectric properties of the BST glass-ceramics. These studies revealed that the Al₂O₃ not only served as a network former, but also acted as a network modifier, weakening the network. Additionally, the variation of the SiO₂/Al₂O₃ ratio significantly influenced the dielectric properties of the BST glass-ceramics.

Keywords:

• Barium strontium titanate
• network former
• network modifier
• dielectric properties
• glass ceramics

Acknowledgments

This work was supported by the National Natural Science Foundation of China through NSFC-RFBR project (Grant No. 51111120091) and by the Russian Foundation for Basic Research (grant No. 11-02-91174-NNSF-а). Ivan Baturin acknowledges the financial support of young scientists in the framework of the Ural Federal University development program.