Abstract–-
We have studied the structure, lattice dynamics, and dielectric properties (terahertz spectroscopy) of heteroepitaxial Sr0.5Ba0.5Nb2O6 films grown on MgO (001) substrates by rf cathode sputtering in an oxygen atmosphere. The results demonstrate that the films are heteroepitaxial and homogeneous and have high structural perfection. According to analysis of Raman spectra of the films measured at various temperatures in the range 299–433 K, the behavior of individual vibrational modes shows anomalies at T ≃ 390 ± 10 K, related to the phase transition. The unit cell of barium strontium niobate films 2.4–2.5 μm in thickness is shown to undergo strain both along and across the plane of the interface. Presumably, this is responsible for the increase in the width of the ferroelectric phase transition according to Raman spectroscopy data and also for the observed variations in the dielectric properties of the films in the terahertz frequency range.
Similar content being viewed by others
REFERENCES
Vorotilov, K.A., Mukhortov, V.M., and Sigov, A.S., Integrirovannye segnetoelektricheskie ustroistva (Integrated Ferroelectric Devices), Sigov, A.S., Ed., Moscow: Energoatomizdat, 2011.
Martin, L.W. and Rappe, A.M., Thin-film ferroelectric materials and their applications, Nat. Rev. Mater., 2016, vol. 2, paper 16087.
Kaimieva, O.S., Buyanova, E.S., Petrov, S.A., and Tarakin, N.V., Bismuth- and iron-substituted lanthanum manganite: synthesis and structure, Russ. J. Inorg. Chem., 2019, vol. 64, no. 4, pp. 423–428.
Mittleman, D.M., Perspective: terahertz science and technology, J. Appl. Phys., 2017, vol. 122, paper 230901.
Tonouchi, M., Cutting-edge terahertz technology, Nat. Photonics, 2007, vol. 1, pp. 97–105.
Kuz’minov, Yu.S., Segnetoelektricheskie kristally dlya upravleniya lazernym izlucheniem (Ferroelectric Crystals for Laser Beam Steering), Moscow: Nauka, 1982.
Kanno, I., Piezoelectric MEMS: ferroelectric thin films for MEMS applications, Jpn. J. Appl. Phys., 2018, vol. 57, no. 4, paper 040101.
Cuniot-Ponsard, M., Desvignes, J.M., Bellemain, A., and Bridou, F., Simultaneous characterization of the electro-optic, converse-piezoelectric, and electroabsorptive effects in epitaxial (Sr,Ba)Nb2O6 thin films, J. Appl. Phys., 2011, vol. 109, paper 014107.
Gupta, S., Sharma, S., Ahmad, T., Kaushik, A.S., Jha, P.K., Gupta, V., and Tomar, M., Demonstration of efficient SBN thin film based miniaturized Mach Zehnder EO modulator, Mater. Chem. Phys., 2021, vol. 262, paper 124300.
Pavlenko, A.V., Zakharchenko, I.N., Kudryavtsev, Yu.A., Kiseleva, L.I., and Alikhadzhiev, S.Kh., Structural characteristics of thin Sr0.5Ba0.5Nb2O6 films in the temperature range 20–500°C, Inorg. Mater., 2020, vol. 56, no. 11, pp. 1188–1192.https://doi.org/10.1134/S0020168520100118
Stryukov, D.V. and Pavlenko, A.V., Unit-cell deformation under discontinuous deposition of barium–strontium niobate films, Tech. Phys. Lett., 2019, vol. 45, no. 12, pp. 1191–1193.https://doi.org/10.1134/S1063785019120149
Willmott, P.R., Herger, R., Patterson, B.D., and Windiks, R., Experimental and theoretical study of the strong dependence of the microstructural properties of SrxBa1 – xNb2O6 thin films as a function of their composition, Phys. Rev. B: Condens. Matter Mater. Phys., 2005, vol. 71, no. 14, paper 144114.https://doi.org/10.1103/PhysRevB.71.144114
Pavlenko, A.V., Zinchenko, S.P., Stryukov, D.V., Fedorenko, A.G., and Nazarenko, A.V., Effect of substrate bias on the crystal structure and morphology of barium strontium niobate films grown by rf cathode sputtering, Inorg. Mater., 2021, vol. 57, no. 4, pp. 377–382.https://doi.org/10.1134/S0020168521040117
Antsygin, V.D. and Mamrashev, A.A., Dielectric and optical properties of barium strontium niobate films in the range 0.2–1.3 THz, Avtometriya, 2017, vol. 53, no. 6, pp. 92–96.
Grischkowsky, D. and Keiding, S., THz time-domain spectroscopy of high T c substrates, Appl. Phys. Lett., 1990, vol. 57, no. 10, pp. 1055–1057. https://doi.org/10.1063/1.104280
Amzallag, E., Chang, T.S., Pantell, R.H., and Feigelson, R.S., Raman scattering by SrxBal – xNb2O6, J. Appl. Phys., 1971, vol. 42, no. 8, pp. 3254–3256.
Pugachev, A.M., Zaytseva, I.V., Malinovsky, V.K., Surovtsev, N.V., Ivleva, L.I., and Lykov, P.A., Studying the nonlinear optical response from local polar inhomogeneities in strontium barium niobate crystals of different chemical composition, Bull. Russ. Acad. Sci.: Phys., 2018, vol. 82, no. 3, pp. 261–265.https://doi.org/10.3103/S1062873818030206
Zaytseva, I.V., Pugachev, A.M., Surovtsev, N.V., Ivleva, L.I., and Lykov, P.A., Optical investigations of fluctuation of order parameter in THz range in SrxBa1 – xNb2O6 crystals with different chemical compositions, Ferroelectrics, 2020, vol. 560, no. 1, pp. 102–109.https://doi.org/10.1080/00150193.2020.1722890
Pugachev, A.M., Zaytseva, I.V., Malinovsky, V.K., Surovtsev, N.V., Ivleva, L.I., and Lykov, P.A., Dependence of acoustic anomalies on chemical composition in strontium barium niobate crystals (from conventional ferroelectric to relaxor) probed by Brillouin light scattering, Ferroelectrics, 2019, vol. 542, no. 1, pp. 21–27.https://doi.org/10.1080/00150193.2019.1574657
Buixaderas, E., Gregora, I., Hlinka, J., Dec, J., and Lukasiewicz, T., Raman and IR phonons in ferroelectric Sr0.35Ba0.69Nb2O6.04 single crystals, Phase Transitions, 2013, vol. 86, nos. 2–3, pp. 217–229.https://doi.org/10.1080/01411594.2012.715296
Buixaderas, E., Savinov, M., Kempa, M., Veljko, S., Kamba, S., Petzelt, J., Pankrath, R., and Kapphan, S., Infrared and dielectric spectroscopy of the relaxor ferroelectric Sr0.61Ba0.39Nb2O6, J. Phys.: Condens. Matter, 2005, vol. 17, no. 4, pp. 653–666.https://doi.org/10.1088/0953-8984/17/4/008
ACKNOWLEDGMENTS
We are grateful to N.A. Nikolaev for his assistance in the terahertz measurements and scanning electron microscopic work.
The terahertz dielectric properties and Raman spectra of the samples were measured using equipment at the Optics and Spectroscopy Shared Research Facilities Center, Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences.
In the preparation and scanning electron microscopy characterization of the samples, we used equipment at the High Technologies and Analytics of Nanosystems Shared Research Facilities Center, Novosibirsk State University, and the Nanostructures Shared Research Facilities Center, Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences.
Funding
This work was supported by the Russian Federation Ministry of Science and Higher Education as part of the state research target for the Southern Scientific Center, Russian Academy of Sciences in 2022 and by the Russian Federation President’s Grants Council (grant no. MK-678.2020.2).
The measurements of the terahertz dielectric properties and Raman spectra were supported by the Russian Federation Ministry of Science and Higher Education (state research target, project no. 121032400052-6).
The sample preparation and scanning electron microscopic work was supported by the Russian Federation Ministry of Science and Higher Education (grant no. FSUS-2020-00290.
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
The authors declare that they have no conflicts of interest.
Additional information
Translated by O. Tsarev
Rights and permissions
About this article
Cite this article
Stryukov, D.V., Mamrashev, A.A., Antsygin, V.D. et al. Heteroepitaxial Barium Strontium Niobate Films: Structure, Lattice Dynamics, and Dielectric Properties in the Range 0.1–2.5 THz. Inorg Mater 58, 56–63 (2022). https://doi.org/10.1134/S0020168522010125
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0020168522010125