Temperature-field phase diagram and spontaneous polarization in Pb(Sc1/2Ta1/2)O3 single crystal

The temperature-field phase diagram and the temperature dependence of the spontaneous polarization in Pb(Sc1/2Ta1/2)O3 (PST) have been investigated by measuring the permittivity in the dc biasing field and observing the p-E hysteresis loop, respectively. X-ray diffraction studies to clarify the B-si...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2020-07, Vol.59 (SP), p.1
Main Authors: Iwata, Makoto, Arimoto, Yohei, Suzuki, Yota, Takikawa, Yoshinori, Kishimoto, Shunji, Aoki, Ichiro, Sakakura, Terutoshi, Kimura, Hiroyuki
Format: Article
Language:English
Subjects:
critical endpoint
Ferroelectric materials
Ferroelectricity
Hysteresis loops
Landau theory
Phase diagrams
Polarization
PST
Single crystals
Temperature dependence
temperature-field phase diagram
X-ray diffraction
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Summary:The temperature-field phase diagram and the temperature dependence of the spontaneous polarization in Pb(Sc1/2Ta1/2)O3 (PST) have been investigated by measuring the permittivity in the dc biasing field and observing the p-E hysteresis loop, respectively. X-ray diffraction studies to clarify the B-site cation ordering have also been performed. We have confirmed the PST single crystal used in our experiment to be a disordered PST. We have also determined that the ferroelectric critical endpoint (CEP) on the temperature-field phase diagram in the dc biasing field applied along the [111]c direction (in the cubic coordinate) was at 19.3 °C and 4.85 kV cm−1. Our experimental results of the ferroelectric CEP and the spontaneous polarization in disordered PST are discussed in this paper on the basis of the Landau-type phenomenological theory.
ISSN:0021-4922
1347-4065
DOI:10.35848/1347-4065/aba2c0