Effect of laser processing on physical properties of (Ba0.85Ca0.15Ti0.9Zr0.1O3) lead-free thick films fabricated by the electrophoretic deposition
authors Ramana, EV; Ferreira, NM; Mahajan, A; Ferro, MC; Figueiras, F; Graca, MPF; Valente, MA
nationality International
journal JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
author keywords Thin films; Laser annealing; Electron microscopy; Raman spectroscopy; Piezoelectricity
keywords PIEZOELECTRIC PROPERTIES; DIELECTRIC-PROPERTIES; CERAMICS; VIBRATION; PRESSURE; BATIO3
abstract In this work, we have fabricated lead-free piezoelectric Ba0.85Ca0.15Ti0.9Zr0.1O3 thick films by the electrophoretic deposition (EPD) followed by a continuous-wave CO2 laser annealing and demonstrated the effect of laser energy on the quality of the final product. Thick films annealed under optimized conditions, 50 W/15 min, show a controlled microstructure/density compared to those derived from higher laser power/annealing time/conventional sintering. The increase in laser power above this limit affects the grain growth kinetics and results in the compositional heterogeneities. From the results of Raman spectra, it was found that the film annealed under optimized conditions has a high degree of crystallinity and tetragonality, while the increase in laser fluence results in the growth of A(1g) mode. The controlled composition and microstructure, thus has resulted in the improved ferroelectricity with a remanent polarization 12 mu C/cm(2), on par with the bulk or larger than the films grown by the chemical solution deposition techniques. From the piezoresponse studies, we found that the film annealed at 75 W/5 min has weak ferroelectric nature with no switchable ferroelectric domains compared to those under optimized conditions. Subtle differences in phase transition temperatures and drop in ferroelectric polarization, for films annealed conventionally or at higher laser fluence, are related to porosity or site defects as well as compositional heterogeneities. Our study demonstrates that the combination of EPD and laser annealing is an effective way to achieve high quality piezoelectric thick films with a controlled composition, useful for energy harvesting applications.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0022-3697
year published 2018
volume 113
beginning page 94
ending page 101
digital object identifier (doi) 10.1016/j.jpcs.2017.10.014
web of science category Chemistry, Multidisciplinary; Physics, Condensed Matter
subject category Chemistry; Physics
unique article identifier WOS:000418108600014
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journal impact factor 2.207
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