Monitoring the Structural and Vibrational Properties in RE-Doped SrTiO3 Ceramic Powders

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• 作者：Yuslín G. Abreu ; Julia C. Soares ; Roberto L. Moreira ; Anderson Dias
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：August 4, 2016
• 年：2016
• 卷：120
• 期：30
• 页码：16960-16968
• 全文大小：520K
• 年卷期：0
• ISSN：1932-7455

文摘

X-ray diffraction and Raman spectroscopy were employed to analyze the effect of the rare earth (RE) doping (ionic radii and concentration) on the crystalline structure of Sr_0.97RE_0.03TiO₃ (RE = Sm³⁺, Eu³⁺, Gd³⁺, Dy³⁺, Tm³⁺, Yb³⁺, Lu³⁺) and Sr_1–xEu_xTiO₃ (x varying from 0.01 to 0.19) ceramic powders. We notice drastic changes in both structural and vibrational properties of the investigated samples for increasing dopant concentration into the SrTiO₃ (ST) lattice. The results showed evidence of RE incorporation into both A- and B-sites of the ST structure. Also, tetragonal local symmetry (I4/mcm space group) was observed in RE-doped samples at room temperature from the cubic (Pm3̅m) phase exhibited by phase-pure ST ceramics. The results obtained for the Sr_1–xEu_xTiO₃ ceramic powders showed that these samples undergo a clear cubic-to-tetragonal phase transition for x ≥ 0.13 at room temperature.