期刊
MATERIALS
卷 13, 期 24, 页码 -出版社
MDPI
DOI: 10.3390/ma13245596
关键词
perovskite oxide; ferroelectric; oxygen vacancy; electronic; semiconductor
类别
资金
- Czech Science Foundation [19-09671S]
- European Structural and Investment Funds
- Ministry of Education, Youth and Sports of the Czech Republic through Program Research, Development and Education [SOLID21-CZ.02.1.01/0.0/0.0/16_019/0000760]
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.
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