| Top-seeded solid-state single crystal growth of 0.75(Na0.5Bi0.5)TiO3-0.25SrTiO3 single crystals in oxygen and their characterization |
Phan Gia Le1,2,6, Jong-Sook Lee1
, Hwang-Pill Kim3
, Wook Jo3
, Hang Xie4, Yunfei Chang4, Wenwei Ge5
, John G. Fisher1
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1School of Materials Science and Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, Republic of Korea
2Department of BioNano Technology, Gachon University, 1342 Seongnamdaero, Sujeong-gu, Seongnam-Si, Gyeonggi-Do, 13120, Republic of Korea
3School of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Unist-gil 50, Eonyang-Eup, Ulju-gun, Ulsan, 44919, Republic of Korea
4Functional Materials and Acousto-Optic Instruments Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin, 150080, People’s Republic of China
5Key Laboratory of Automobile Materials, School of Materials Science and Engineering, Jilin University, Changchun, Jilin, 130022, People’s Republic of China |
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Received: March 11, 2024; Revised: May 14, 2024 Accepted: June 6, 2024. Published online: June 27, 2024. |
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| ABSTRACT |
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In this present work, 0.75(Na0.5Bi0.5)TiO3-0.25SrTiO3 single crystals were grown by top-seeded solid-state crystal growth under an oxygen atmosphere. Growth in oxygen resulted in improved single-crystal growth and density compared to single crystals previously grown in air. X-ray diffraction revealed the simultaneous presence of tetragonal and cubic phases in the crystal while Raman scattering suggested the presence of rhombohedral and tetragonal phases. Piezoresponse force microscopy and electrostatic force microscopy show that the single crystal is in an ergodic relaxor state and electrostatic force microscopy shows that ferroelectric domains can be induced by an electric field. Dielectric property measurements show behaviour typical of an (Na0.5Bi0.5)TiO3-type relaxor material. Polarization and strain vs. electric field hysteresis measurements show that the single crystal is an incipient ferroelectric. A maximum strain of 0.48% was obtained at an electric field of 3.5 kV/mm, giving Smax/Emax = 1365 pm/V, which is an enhancement of 32% compared to 0.75(Na0.5Bi0.5)TiO3-0.25SrTiO3 single crystals grown in air. |
| Key words:
(Na0.5Bi0.5)TiO3 · Single crystal · Piezoelectric properties · Ferroelectric properties · Actuators |
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