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8 August 2003 Glass to ferroelectric phase transition induced by ac electric field in PbMg1/3Nb2/3O3 thin films
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Proceedings Volume 5122, Advanced Organic and Inorganic Optical Materials; (2003) https://doi.org/10.1117/12.515667
Event: 2003 Chapter books, 2003, Bellingham, WA, United States
Abstract
The nonlinear dielectric response of epitaxial heterostructures of relaxor ferroelectric PbMg1/3Nb2/3O3 thin films was experimentally studied using digital Fourier analysis. The amplitudes and the phase angles of the dielectric harmonics were determined as a function of temperature and the amplitude of the sinusoidal ac field. The response of the films was reconstructed assuming a linear contribution of the film-electrode interface capacitance. In the films at low amplitudes of ac field, a glass-like behavior was identified by a maximum in the third-order nonlinear dielectric permittivity around the freezing temperature, accompanied by a square field dependence of the amplitudes of the odd harmonics and the absence of the even-order harmonics. With increasing amplitude of ac field, a glass-to-ferroelectric transition was indicated by a deviation from the square field dependence of the amplitudes of the odd harmonics, the appearance of the even-order harmonics, and the switching of the phase angle of the third harmonic to 90°. Such an unstable glassy behavior was suggested to originate due to the presence of interfaces, crystallographic strain, and nanometer-scale structural features.
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M. Tyunina, K. Kundzins, Vismants Zauls, and Juhani Levoska "Glass to ferroelectric phase transition induced by ac electric field in PbMg1/3Nb2/3O3 thin films", Proc. SPIE 5122, Advanced Organic and Inorganic Optical Materials, (8 August 2003); https://doi.org/10.1117/12.515667
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