Raman characterization of Pb_2Na_(1-x)La xNb_(5-x)FexO_(15) and Pb _(0.5(5-X))LaxNb_(5-x)Fe_xO_(15) (0 ≤ x ≤ 1) solid solutions

Bouziane M.; Taibi M.; Saviot L.; Boukhari A.

首页> 外文期刊>Physica, B. Condensed Matter >Raman characterization of Pb_2Na_(1-x)La xNb_(5-x)FexO_(15) and Pb _(0.5(5-X))LaxNb_(5-x)Fe_xO_(15) (0 ≤ x ≤ 1) solid solutions

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Raman characterization of Pb_2Na_(1-x)La xNb_(5-x)FexO_(15) and Pb _(0.5(5-X))LaxNb_(5-x)Fe_xO_(15) (0 ≤ x ≤ 1) solid solutions

机译：Pb_2Na_（1-x）La xNb_（5-x）FexO_（15）和Pb_（0.5（5-X））LaxNb_（5-x）Fe_xO_（15）（0≤x≤1）固溶体的拉曼表征

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The ferroelectric compounds Pb2Na1-xLa xNb5-xFexO15 and Pb 0.5(5-x)LaxNb5-xFexO15 (0≤x≤ 1) with the tungsten bronze type structure have been investigated using Raman spectroscopy. The evolution of the spectra as a function of composition at room temperature is reported. In the frequency range 200-1000 cm-1 three main A1 phonons around 240 (ν1), 630 (ν2) and 816 (ν3)cm-1 were observed. The broadening of the Raman lines for high values of x originates from a significant structural disorder. This is in good agreement with the relaxor character of these compositions. The lowest-frequency part of the spectra, below 180 cm-1, reveals a structural change in the studied solid solutions. The behaviour of the Raman shift of the ν1 mode confirms that in Pb2Na1-xLaxNb 5-xFexO15, a clear anomaly occurs in the vicinity of x=0.4.

机译：使用拉曼光谱法研究了具有钨青铜型结构的铁电化合物Pb2Na1-xLa xNb5-xFexO15和Pb 0.5（5-x）LaxNb5-xFexO15（0≤x≤1）。报告了光谱在室温下随组成变化的过程。在200-1000 cm-1的频率范围内，观察到240（ν1），630（ν2）和816（ν3）cm-1的三个主要A1声子。高x值的拉曼谱系的展宽源自明显的结构紊乱。这与这些组合物的松弛特性非常吻合。光谱的最低频率部分（低于180 cm-1）揭示了所研究固溶体的结构变化。 ν1模式的拉曼位移的行为证实了在Pb2Na1-xLaxNb 5-xFexO15中，在x = 0.4附近出现了明显的异常。

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《Physica, B. Condensed Matter》 |2011年第22期|共4页
作者
Bouziane M.; Taibi M.; Saviot L.; Boukhari A.;
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正文语种 eng
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Raman scattering; Relaxor behaviour; Structural change; Tungsten bronze;

机译：拉曼散射;弛豫特性;结构变化;钨青铜;

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机译：Pb_2Na_（1-x）La xNb_（5-x）FexO_（15）和Pb_（0.5（5-X））LaxNb_（5-x）Fe_xO_（15）（0≤x≤1）固溶体的拉曼表征
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Raman characterization of Pb_2Na_(1-x)La xNb_(5-x)FexO_(15) and Pb _(0.5(5-X))LaxNb_(5-x)Fe_xO_(15) (0 ≤ x ≤ 1) solid solutions

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