Dependence of dielectric and piezoelectric properties on film thickness for highly {100}-oriented lead magnesium niobate–lead titanate (70/30) thin films
Dependence of dielectric and piezoelectric properties on film thickness for highly {100}-oriented lead magnesium niobate–lead titanate (70/30) thin films
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DOI：
10.1557/jmr.2001.0040
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发表时间：
2001-01
影响因子：
2.7
通讯作者：
Jeong Hwan Park;S. Trolier-McKinstry
中科院分区：
文献类型：
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作者：
Jeong Hwan Park;S. Trolier-McKinstry
采用化学溶液法制备了厚度为0.35 ~ 2.1mm的{100}取向的镁钛酸铅-钛酸铅（PMN-PT）（70/30）薄膜。随着厚度的增加，择优取向程度变化不大。然而，所测得的介电常数，reversible极化，和压电系数（d_31）增加，随着膜厚度的增加。在镀Pt的Si衬底上，高度{100}取向的PMN-PT薄膜的有效d_31系数范围为−16至−96 pC/N。极化过程中的紫外线照射导致薄膜的异常老化行为和较低的整体老化速率。初始的非线性老化行为归因于光生载流子产生的内部空间电荷场的存在。随着空间电荷场随时间衰减，d_31的幅度增加，直到极化后450-500分钟，此时d_31保持不变或略有下降。因此，极化后500-600 min，d_31的变化限于1-2%/十年。
Fiber textured {100}-oriented lead magnesium niobate–lead titanate (PMN–PT) (70/30) films with thicknesses between 0.35 and 2.1 mm were prepared using chemical solution processing. The degree of preferred orientation changed little with increasing thickness. However, the measured dielectric constant, remanent polarization, and piezoelectric coefficients (d_31) increased with increasing film thickness. The effective d_31 coefficients of highly {100}-oriented PMN–PT films on Pt-coated Si substrates were found to range from −16 to −96 pC/N. Ultraviolet illumination during poling resulted in abnormal aging behaviors and lower overall aging rates for the films. The initial nonlinear aging behavior was attributed to the presence of an internal space-charge field that developed from photoinduced charge carriers. As the space-charge field decays over time, the magnitude of d_31 increased until 450–500 min after poling, at which time d_31 remained either constant or declined slightly. Thus, the changes in d_31 were limited to 1–2%/decade 500–600 min after poling.