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首页> 外文会议>Ferroelectric Thin Films XII >Temperature Dependent Raman Scattering and Dielectric Permittivity Measurements of Pb_(1-x)Sr_x TiO_3 Films
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Temperature Dependent Raman Scattering and Dielectric Permittivity Measurements of Pb_(1-x)Sr_x TiO_3 Films

机译：Pb_（1-x）Sr_x TiO_3薄膜的温度相关拉曼散射和介电常数的测量

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摘要

Pb_(1-x) Sr_x TiO_3 (x = 0 to 1.0) films of thickness ～ 4 μm have been prepared on sapphire and Pt substrates by metalorganic decomposition (MOD) method. X-ray diffraction results show that the films are polycrystalline with a perovskite tetragonal phase at room temperature for x < 0.5 and a cubic phase for x > 0.5. Room temperature Raman spectra show a systematic variation of lattice vibrational modes with x. The most notable changes in the Raman spectra with x are the decrease in the splitting of A_1(3TO) and E(3TO) modes and the disappearance of E(3TO) mode at x ～ 0.6. Although the x-ray diffraction peaks for films with x > 0.5 show a cubic phase at room temperature, the Raman spectra show the characteristic phonon modes of a tetragonal phase even at x = 0.7. The dielectric permittivity versus temperature measurements for films with x ≤ 0.7 show a broad dielectric anomaly corresponding to a diffuse ferroelectric to paraclectric phase transition. The phase transition temperature (T_c) values are consistently lower than the corresponding bulk ceramic alloys. Furthermore, T_c are also determined by monitoring the temperature dependence of the splitting between E(3TO) and A_1(3TO) phonon modes in the Raman spectra of Pb_(1-x)Sr_x TiO_3 films for x ≤ 0.6. There has been good agreement between the two methods.
机译：通过金属有机分解（MOD）法在蓝宝石和Pt衬底上制备了厚度约为4μm的Pb_（1-x）Sr_x TiO_3（x = 0至1.0）薄膜。 X射线衍射结果表明，该膜是多晶的，在室温下对于x ＜0.5具有钙钛矿四方相，对于x＞ 0.5具有立方相。室温拉曼光谱显示晶格振动模式随x的系统变化。拉曼光谱随x的最显着变化是在x〜0.6时，A_1（3TO）和E（3TO）模式的分裂减少以及E（3TO）模式的消失。尽管x> 0.5的薄膜的x射线衍射峰在室温下显示立方相，但拉曼光谱甚至在x = 0.7时也显示出四方相的特征声子模。 x≤0.7的薄膜的介电常数相对于温度的测量结果显示出宽泛的介电异常，对应于从铁电体到旁核的相变。相变温度（T_c）值始终低于相应的块状陶瓷合金。此外，T_c还可以通过监测x≤0.6的Pb_（1-x）Sr_x TiO_3薄膜的拉曼光谱中E（3TO）和A_1（3TO）声子模之间的分裂的温度依赖性来确定。两种方法之间已经达成了很好的协议。

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