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采用热力学非线性理论,研究了外加电场对立方基底Pb(Zr0.3Ti0.7)O3(PZT)铁电薄膜相变的影响.通过数值计算,得到了“失配应变-外加电场”相图,及外加电场与极化强度的关系.当外加电场达到186kV/cm时,能使生长在SrTiO3基底上PZT铁电薄膜从单斜r相转变为c相.在实验上,采用扫描探针显微镜通过对PZT薄膜施加不同的极化电场来研究了它的电畴翻转.从得到的压电响应相图可以看出,绝大多数的电畴是清晰可见的.当外加极化电场达到200kV/cm时,处于单斜r相的电畴被翻转到c相的极化方向,这与前面理论计算的结果比较符合.
The effect of applied electric field on the phase transformation of cubic (Pb0.3Ti0.7) O3 (PZT) ferroelectric thin films was investigated by using the thermodynamic nonlinear theory. By numerical calculation, the “mismatch strain-applied electric field” phase When the applied electric field reaches 186kV / cm, the PZT ferroelectric thin film grown on the SrTiO3 substrate can be changed from monoclinic r phase to c phase.In the experiment, the scanning probe Microscopic examination of the domain inversion by applying a different polarization electric field to the PZT film reveals that the majority of the domains are clearly visible.When the applied polarization electric field reaches 200 kV / cm, the domain in the monoclinic r-phase is flipped to the polarization of the c-phase, which is in good agreement with the previous theoretical calculations.