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Issue 30, 2017
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Temperature and composition dependent phase transitions of lead-free piezoelectric (Bi0.5Na0.5)TiO3–BaTiO3 thin films

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Abstract

Extensive studies on (Bi0.5Na0.5)TiO3–BaTiO3 piezoceramics have aroused growing interest in developing high-performance piezoelectric films based on this promising lead-free piezoelectric system. High quality (1 − x%) (Bi0.5Na0.5)TiO3x% BaTiO3 (x = 0–15) thin films were synthesized on Pt(111)/Ti/SiO2/Si(100) substrates via a sol–gel method. The phase transitions as functions of composition and temperature were investigated by X-ray diffraction (XRD) and temperature-dependent Raman spectra analysis. A morphotropic phase boundary (MPB) located at 5 ≤ x ≤ 10 was found in the films, being identical to that in bulk materials. Additionally, complicated structural changes with temperature in a wide composition range were observed, which correspond to the evolution from a low-symmetry ferroelectric phase or a relaxor phase to high-symmetry relaxor phases. The ferroelectricity and piezoelectricity were also systematically studied with an emphasis on the influence of composition and phase structure. A phase diagram focusing on the above two kinds of phase transitions has been proposed in this work.

Graphical abstract: Temperature and composition dependent phase transitions of lead-free piezoelectric (Bi0.5Na0.5)TiO3–BaTiO3 thin films

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Publication details

The article was received on 25 May 2017, accepted on 03 Jul 2017 and first published on 03 Jul 2017


Article type: Paper
DOI: 10.1039/C7CP03530F
Citation: Phys. Chem. Chem. Phys., 2017,19, 19992-19997
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    Temperature and composition dependent phase transitions of lead-free piezoelectric (Bi0.5Na0.5)TiO3–BaTiO3 thin films

    Z. Zhou, J. Luo, W. Sun and J. Li, Phys. Chem. Chem. Phys., 2017, 19, 19992
    DOI: 10.1039/C7CP03530F

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