Cerium Doping Effect in Barium Strontium Titanate Glass-Ceramics

Abstract

Abstract: Cerium doping effect in (Ba,Sr)TiO₃ glass-ceramics has been investigated by X-ray photoelectron spectroscopy,ultraviolet-visible diffuse-reflectance spectroscopy,Fourier transform infrared spectroscopy and Raman spectroscopy.Studies were performed on specimens for BaO-SrO-TiO₂-Al₂O₃-SiO₂ glass system (with 0%,1%,2% and 3% mole fraction of cerium).With the change of relative content of Ce³⁺ and Ce⁴⁺,cerium mainly acts as Ce⁴⁺ in the Ti⁴⁺-site of (Ba,Sr)TiO₃ lattice at low content and then cerium substitution gradually occurs in the Ba²⁺/Sr²⁺-site as Ce³⁺ with increasing cerium mole content.The CeO₂ addition in the glass could effectively improve the connectivity of network structure.In (Ba,Sr)TiO₃ glass-ceramics,with the increase of cerium content (0% to 2%),the value of band gap energy decreases,electronic transition energy decreases,then electrons transit from the valence band to the conduction band easily,and the conductivity increases.In contrast,when the mole fraction of cerium increased from 2% to 3%,the value of band gap energy increases,so the conductivity decreases.The results of Raman spectra confirm that cerium ions diffuse into the (Ba,Sr)TiO₃ lattice structure and modify the tetragonality of the barium strontium titanate phase.

Key words: barium strontium titanate, glass-ceramics, ceria, doping effect, band gap

CLC Number:

TQ171

ZHAO Zhangyuan, LIANG Xuewei, ZHANG Yong. Cerium Doping Effect in Barium Strontium Titanate Glass-Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(1): 258-265.

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