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Article

Oxygen Vacancies in Perovskite Oxide Piezoelectrics

1
Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FI-90014 Oulu, Finland
2
Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, 18221 Prague, Czech Republic
Materials 2020, 13(24), 5596; https://doi.org/10.3390/ma13245596
Submission received: 10 November 2020 / Revised: 4 December 2020 / Accepted: 7 December 2020 / Published: 8 December 2020
(This article belongs to the Special Issue Piezoelectric Ceramics: From Fundamentals to Applications)

Abstract

The excellent electro-mechanical properties of perovskite oxide ferroelectrics make these materials major piezoelectrics. Oxygen vacancies are believed to easily form, migrate, and strongly affect ferroelectric behavior and, consequently, the piezoelectric performance of these materials and devices based thereon. Mobile oxygen vacancies were proposed to explain high-temperature chemical reactions half a century ago. Today the chemistry-enabled concept of mobile oxygen vacancies has been extrapolated to arbitrary physical conditions and numerous effects and is widely accepted. Here, this popular concept is questioned. The concept is shown to conflict with our modern physical understanding of ferroelectrics. Basic electronic processes known from mature semiconductor physics are demonstrated to explain the key observations that are groundlessly ascribed to mobile oxygen vacancies. The concept of mobile oxygen vacancies is concluded to be misleading.
Keywords: perovskite oxide; ferroelectric; oxygen vacancy; electronic; semiconductor perovskite oxide; ferroelectric; oxygen vacancy; electronic; semiconductor

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MDPI and ACS Style

Tyunina, M. Oxygen Vacancies in Perovskite Oxide Piezoelectrics. Materials 2020, 13, 5596. https://doi.org/10.3390/ma13245596

AMA Style

Tyunina M. Oxygen Vacancies in Perovskite Oxide Piezoelectrics. Materials. 2020; 13(24):5596. https://doi.org/10.3390/ma13245596

Chicago/Turabian Style

Tyunina, Marina. 2020. "Oxygen Vacancies in Perovskite Oxide Piezoelectrics" Materials 13, no. 24: 5596. https://doi.org/10.3390/ma13245596

APA Style

Tyunina, M. (2020). Oxygen Vacancies in Perovskite Oxide Piezoelectrics. Materials, 13(24), 5596. https://doi.org/10.3390/ma13245596

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