IT Convergence & Components Laboratory, Electronics and Telecomunications Research Institute, Daejeon, Korea.
IEEE Trans Ultrason Ferroelectr Freq Control. 2011 Nov;58(11):2276-80. doi: 10.1109/TUFFC.2011.2084.
Terahertz time-domain spectroscopy has been used to investigate the dielectric and optical properties of ferroelectric Ba(x)Sr(1-x)TiO(3) thin films for nominal x-values of 0.4, 0.6, and 0.8 in the frequency range of 0.3 to 2.5 THz. The ferroelectric thin films were deposited at approximately 700 nm thickness on [001] MgO substrate by pulsed laser deposition. The measured complex dielectric and optical constants were compared with the Cole-Cole relaxation model. The results show that the Cole-Cole relaxation model fits well with the data throughout the frequency range and the dielectric relaxation behavior of ferroelectric Ba(x)Sr(1-x)TiO(3) thin films varies with the films compositions. Among the compositions of Ba(x)Sr(1-x)TiO(3) films with different Ba/Sr ratios, Ba(0.6)Sr(0.4)TiO(3) has the highest dielectric constants and the shortest dielectric relaxation time.
太赫兹时域光谱已被用于研究铁电 Ba(x)Sr(1-x)TiO(3) 薄膜在 0.3 到 2.5 THz 频率范围内的介电和光学性质，x 值分别为 0.4、0.6 和 0.8。铁电薄膜通过脉冲激光沉积在[001]MgO 衬底上沉积约 700nm 厚。测量的复介电常数和光学常数与科尔-科尔弛豫模型进行了比较。结果表明，科尔-科尔弛豫模型在整个频率范围内都很好地拟合了数据，铁电 Ba(x)Sr(1-x)TiO(3) 薄膜的介电弛豫行为随薄膜组成而变化。在不同 Ba/Sr 比的 Ba(x)Sr(1-x)TiO(3) 薄膜组成中，Ba(0.6)Sr(0.4)TiO(3) 具有最高的介电常数和最短的介电弛豫时间。
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