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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Monitoring the Structural and Vibrational Properties in RE-Doped SrTiO3 Ceramic Powders
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Monitoring the Structural and Vibrational Properties in RE-Doped SrTiO3 Ceramic Powders

机译：监测稀土掺杂SrTiO3陶瓷粉末的结构和振动性能

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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 Sr0.97RE0.03TiO3 (RE = Sm3+, Eu3+, Gd3+, Dy3+, Tm3+, Yb3+, Lu3+) and Sr1_xEuxTiO3 (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 (Pm (3) over barm) phase exhibited by phase-pure ST ceramics. The results obtained for the Sr1_xEuxTiO3 ceramic powders showed that these samples undergo a clear cubic-to-tetragonal phase transition for x >= 0.13 at room temperature.
机译：利用X射线衍射和拉曼光谱分析稀土（RE）掺杂（离子半径和浓度）对Sr0.97RE0.03TiO3（RE = Sm3 +，Eu3 +，Gd3 +，Dy3 +，Tm3 +， Yb3 +，Lu3 +）和Sr1_xEuxTiO3（x在0.01到0.19之间变化）陶瓷粉末。我们注意到被调查样品的结构和振动特性都发生了急剧变化，以增加进入SrTiO3（ST）晶格中的掺杂剂浓度。结果表明RE掺入ST结构的A位和B位的证据。同样，在室温下，从纯相ST陶瓷表现出的立方（Pm（3）over barm）相中，在稀土掺杂样品中观察到四方局部对称性（I4 / mcm空间群）。对于Sr1_xEuxTiO3陶瓷粉末获得的结果表明，这些样品在室温下经历了清晰的立方到四方相变，且x> = 0.13。

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