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首页> 外文期刊>Phase Transitions >Dielectric, thermal and Raman spectroscopy studies of lead-free (Na0.5Bi0.5)(1-x)SrxTiO3 (x=0, 0.04 and 0.06) ceramics
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Dielectric, thermal and Raman spectroscopy studies of lead-free (Na0.5Bi0.5)(1-x)SrxTiO3 (x=0, 0.04 and 0.06) ceramics

机译:无铅(Na0.5Bi0.5)(1-x)SrxTiO3(x = 0、0.04和0.06)陶瓷的介电,热和拉曼光谱研究

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摘要

Lead-free (Na0.5Bi0.5)(1-x)SrxTiO3 (x = 0, 0.04 and 0.06) ceramics with relative densities above 97% were prepared by solid-state synthesis process. Their dielectric, thermal and Raman properties were studied. X-ray diffraction analysis shows perovskite structure with rhombohedral symmetry at room temperature. Sr doping of Na0.5Bi0.5TiO3 (NBT) results in an increase of the dielectric permittivity, diffusing of the permittivity maximum and its shift toward lower temperatures. The temperature of the rhombohedral-tetragonal phase transition indicated by the differential scanning calorimetry (DSC) peak and relaxational dielectric anomaly near the depolarization temperature are also shifted toward lower temperatures. The observed increase and broadening of the permittivity maximum, enhancement of the dielectric relaxation near the depolarization temperature, broadening of the DSC anomaly related to the rhombohedral-tetragonal phase transition and broadening of the Raman bands with increasing Sr content are attributed to the increase of the degree of cationic disorder and evident enhancement of the relaxor-like features in NBT-xST. This enhancement could play a positive role in the improvement of the piezoelectric performance of NBT-based ceramics.
机译:通过固态合成工艺制备了相对密度大于97%的无铅(Na0.5Bi0.5)(1-x)SrxTiO3(x = 0、0.04和0.06)陶瓷。研究了它们的介电,热和拉曼性能。 X射线衍射分析显示钙钛矿结构在室温下具有菱面体对称性。 Sr掺杂的Na0.5Bi0.5TiO3(NBT)导致介电常数的增加,介电常数最大值的扩散及其向较低温度的偏移。由差示扫描量热法(DSC)峰指示的菱形-四边形相变的温度和去极化温度附近的弛豫介电异常也向较低温度移动。观察到的介电常数最大值的增加和扩展,在去极化温度附近的介电弛豫的增强,与菱形-四边形相变有关的DSC异常的扩展以及随着Sr含量增加的拉曼谱带的扩展归因于阳离子障碍的程度和NBT-xST中类似松弛子的特征的明显增强。这种增强作用可以在改善NBT基陶瓷的压电性能中发挥积极作用。

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