University of Oulu

Tyunina, M., Pacherova, O., Peräntie, J., Savinov, M., Jelinek, M., Jantunen, H., & Dejneka, A. (2019). Perovskite ferroelectric tuned by thermal strain. Scientific Reports, 9(1).

Perovskite ferroelectric tuned by thermal strain

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Author: Tyunina, Marina1,2; Pacherova, Oliva2; Peräntie, Jani1;
Organizations: 1Microelectronics Research Unit, University of Oulu, P.O. Box 4500, FI-90014, Oulu, Finland
2Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 18221, Prague, Czech Republic
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.7 MB)
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Language: English
Published: Springer Nature, 2019
Publish Date: 2019-09-05


Modern environmental and sustainability issues as well as the growing demand for applications in the life sciences and medicine put special requirements to the chemical composition of many functional materials. To achieve desired performance within these requirements, innovative approaches are needed. In this work, we experimentally demonstrate that thermal strain can effectively tune the crystal structure and versatile properties of relatively thick films of environmentally friendly, biocompatible, and low-cost perovskite ferroelectric barium titanate. The strain arises during post-deposition cooling due to a mismatch between the thermal expansion coefficients of the films and the substrate materials. The strain-induced in-plane polarization enables excellent performance of bottom-to-top barium titanate capacitors akin to that of exemplary lead-containing relaxor ferroelectrics. Our work shows that controlling thermal strain can help tailor response functions in a straightforward manner.

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Series: Scientific reports
ISSN: 2045-2322
ISSN-E: 2045-2322
ISSN-L: 2045-2322
Volume: 9
Article number: 3677
DOI: 10.1038/s41598-019-40260-y
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: The authors acknowledge support from the European Structural and Investment Funds and the Ministry of Education, Youth and Sports of the Czech Republic through Programme “Research, Development and Education” (Project No. SOLID21 - CZ.02.1.01/0.0/0.0/16_019/0000760), the Czech Science Foundation (Grant No. 1909671S), the Academy of Finland (Grant No. 298409), and the European Research Council (Advanced Grant No. 291132).
EU Grant Number: (291132) ULTIMATE CERAMICS - Printed Electroceramics with Ultimate Compositions
Academy of Finland Grant Number: 298409
Detailed Information: 298409 (Academy of Finland Funding decision)
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