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Macroscopic and local approaches of phase transition in sol–gel synthesized (Bi0.5Na0.5)TiO3–SrTiO3 thin films

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Abstract

High-quality (1 − x)(Bi0.5Na0.5)TiO3xSrTiO3 lead-free piezoelectric thin films (x = 0, 0.1, and 0.25) on Pt(111)/Ti/SiO2/Si(100) substrates were prepared by a sol–gel method. The microstructures of the thin films as a function of SrTiO3 doping level and temperature were investigated by X-ray diffraction and Raman spectroscopy. Their temperature- and frequency-dependent piezoelectric properties were studied on the nanoscale using switching spectroscopy piezoresponse force microscopy (SS-PFM). A rhombohedral ferroelectric to pseudocubic relaxor phase transition was observed when either ST content or temperature increased. The significant frequency dependence of both ferroelectric and piezoelectric properties was also disclosed by analyzing polarization hysteresis loops on the macroscopic scale and local switching dynamics at various frequencies. It was determined that the short-range order clusters came out through the long-range ferroelectric order, thus the nanoscale approaches are consistent with macroscopic data at elevated temperatures and various frequency ranges.

Graphical abstract: Macroscopic and local approaches of phase transition in sol–gel synthesized (Bi0.5Na0.5)TiO3–SrTiO3 thin films

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Publication details

The article was received on 21 Mar 2018, accepted on 01 May 2018 and first published on 01 May 2018


Article type: Paper
DOI: 10.1039/C8CP01830H
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    Macroscopic and local approaches of phase transition in sol–gel synthesized (Bi0.5Na0.5)TiO3–SrTiO3 thin films

    H. Lee, J. Luo, Z. Zhou, W. Sun and J. Li, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C8CP01830H

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