Misfit strain relaxations of (101)-oriented ferroelectric PbTiO3/(La, Sr)(Al, Ta)O3 thin film systems

Abstract

High-index ferroelectric thin films show excellent dielectricity, piezoelectricity and switching behaviors. Understanding the misfit strain relaxation behavior may prove beneficial to gaining insights into the high-quality growth of high-index ferroelectric films. In this study, ferroelectric PbTiO3 thin films were deposited on the (101)-oriented (La, Sr)(Al, Ta)O3 substrate by pulsed laser deposition and were investigated using (scanning) transmission electron microscopy. Two types of misfit dislocations with line directions of <111> and [010] were found at the interface. The <111> dislocation exhibited Burgers vectors of a [011] or [01\(\overline{1}\)1], while the [010] dislocation featured Burgers vectors of a[\(\overline{1}\)01]. The former might be generated by gliding, and the latter by climbing. We propose that the misfit strain relaxation in this film system basically results from the formation of dislocations and the residual misfit strain is relaxed via the formation of 90° ac domains.

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ACKNOWLEDGMENTS

This work is supported by the National Natural Science Foundation of China (Nos. 51571197, 51501194, and 51671194), National Basic Research Program of China (2014CB921002), and the Key Research Program of Frontier Sciences CAS (QYZDJ-SSW-JSC010). Y.L.T. acknowledges the IMR SYNL-T.S. Kê Research Fellowship and the Youth Innovation Promotion Association CAS (No. 2016177). The authors are grateful to Mr. B. Wu and Mr. L.X. Yang for their technical support on the Titan platform of G2 60-300 kV aberration-corrected scanning transmission electron microscope.

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Correspondence to Yinlian Zhu.

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Feng, Y., Tang, Y., Zhu, Y. et al. Misfit strain relaxations of (101)-oriented ferroelectric PbTiO3/(La, Sr)(Al, Ta)O3 thin film systems. Journal of Materials Research 33, 4156–4164 (2018). https://doi.org/10.1557/jmr.2018.422

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