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Pulse-based electron spin transient nutation measurement of BaTiO₃ fine particle: Identification of controversial signal around g = 2.00
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- Sawai, Takatoshi
- Toray Research Center, Inc.
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- Yamaguchi, Yoji
- Toray Research Center, Inc.
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- Kitamura, Noriko
- Toray Research Center, Inc.
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- Date, Tomotsugu
- Toray Research Center, Inc.
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- Konishi, Shinya
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University
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- Taga, Kazuya
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University
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- Tanaka, Katsuhisa
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University
Bibliographic Information
- Other Title
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- Pulse-based electron spin transient nutation measurement of BaTiO3 fine particle: Identification of controversial signal around <i>g</i> = 2.00
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Description
Two dimensional pulse-based electron spin transient nutation (2D-ESTN) spectroscopy is a powerful tool for determining the spin quantum number and has been applied to BaTiO₃ fine powder in order to identify the origin of the continuous wave electron spin resonance (CW-ESR) signal around g = 2.00. The signal is frequently observed in BaTiO3 ceramics, and the correlation between the signal intensity and positive temperature coefficient of resistivity (PTCR) properties has been reported to date. The CW-ESR spectrum of BaTiO3 fine particles synthesized by the sol-gel method shows a typical asymmetric signal at g = 2.004. The 2D-ESTN measurements of the sample clearly reveal that the signal belongs to the S = 5/2 high spin state, indicating that the signal is not due to a point defect as suggested by a number of researchers but rather to a transition metal ion. Our elemental analysis, as well as previous studies, indicates that the origin of the g = 2.004 signal is due to the presence of an Fe3+impurity. The D value (second-order fine structure parameter) reveals that the origin of the signal is an Fe3+ center with distant charge compensation. In addition, we show a peculiar temperature dependence of the CW-ESR spectrum, suggesting that the phase transition behavior of a BaTiO3 fine particle is quite different from that of a bulk single crystal. Our identification does not contradict a vacancy-mediated mechanism for PTCR. However, it is incorrect to use the signal at g = 2.00 as evidence to support the vacancy-mediated mechanism.
Journal
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- Applied Physics Letters
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Applied Physics Letters 112 (20), 2018-05-14
AIP Publishing
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Details 詳細情報について
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- CRID
- 1050845763220922112
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- NII Article ID
- 120006539615
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- ISSN
- 00036951
- 10773118
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- HANDLE
- 2433/235323
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- Text Lang
- en
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- Article Type
- journal article
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- Data Source
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- IRDB
- CiNii Articles
- OpenAIRE
