1. A sodium bismuth titanate-based material with both high depolarization temperature and large pyroelectric response.
- Author
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He, Shuang, Guo, Shaobo, Cao, Fei, Yao, Chunhua, and Wang, Genshui
- Subjects
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TITANATES , *HIGH temperatures , *BISMUTH , *LEAD-free ceramics , *INFRARED detectors , *DIELECTRIC loss , *PERMITTIVITY , *CERAMICS - Abstract
Practical pyroelectric materials require excellent pyroelectric performance, high depolarization temperature, and good temperature stability. In this work, the microstructure, ferroelectric, dielectric, and pyroelectric properties were studied systematically in (Bi0.5Na0.5)TiO3–0.1%MnCO3 (BNT–Mn) lead-free ceramics. It is observed that the pyroelectric coefficient p reaches 2.90 × 10−4 C m−2 K−1 at room temperature in the samples. Due to the low dielectric constant (291) and dielectric loss (0.010), the figures of merit (FoMs) Fi, Fv, and FD are as high as 1.03 × 10−10 m/V, 4.05 × 10−2 m2/C, and 1.86 × 10−5 Pa−1/2, measured at 1 kHz. With the increase in temperature, the p and FoMs change slightly, showing good temperature stability. More importantly, a relatively high depolarization temperature of 205 °C is achieved, which should help deliver reliable operation in practice. In general, all performances reveal that BNT–Mn ceramics are expected to pave the way for uncooled infrared detector applications. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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