Infrared dielectric response and Raman spectra of tunable Ba0.5Sr0.5TiO3–Mg2TiO4 composite ceramics
Infrared dielectric response and Raman spectra of tunable Ba0.5Sr0.5TiO3–Mg2TiO4 composite ceramics
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DOI：
10.1063/1.3280025
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发表时间：
2010-01
影响因子：
3.2
通讯作者：
Jingji Zhang;J. Zhai;J. Wang;J. Shao;Xiang Lu;X. Yao
中科院分区：
文献类型：
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作者：
Jingji Zhang;J. Zhai;J. Wang;J. Shao;Xiang Lu;X. Yao
用光谱技术研究了（1-y）Ba_（0.5）Sr_（0.5）TiO_（3-y）Mg_（2 TiO_4）（y=0.5-0.8）复相陶瓷的介电性能。Mg 2 TiO 4浓度的增加导致最软模式的硬化，这是由于固有介电常数和介电损耗随y的增加而降低。软模随着y的增加而变硬，成为谐波，这导致Ba_（0.5）Sr_（0.5）TiO_3-Mg_2 TiO_4复合陶瓷的可调性降低。拉曼光谱显示MgO 4弯曲振动的线宽随着y的增加而减小，证实了内在品质因子随着y的增加而增加。
Dielectric properties of (1−y)Ba0.5Sr05TiO3–yMg2TiO4 (y=0.5–0.8) composite ceramics were studied by using spectroscopic techniques. Increasing the concentration of Mg2TiO4 resulted in hardening of the softest mode, which is responsible for the decrease in the intrinsic permittivity and dielectric loss with increasing y. The soft mode hardens with y and becomes harmonic, which caused the reduction in tunability of the Ba0.5Sr05TiO3–Mg2TiO4 composite ceramics. Raman spectra revealed that linewidth of the MgO4 bending vibration decreases with increasing y, confirming the increase in intrinsic quality factor with y.