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High performance Bi0.5Na0.5TiO3-BiAlO3-K0.5Na0.5NbO3 lead-free pyroelectric ceramics for thermal detectors.
- Source :
-
Applied Physics Letters . 4/2/2018, Vol. 112 Issue 14, p1-1. 1p. 1 Chart, 5 Graphs. - Publication Year :
- 2018
-
Abstract
- Both high pyroelectric properties and good temperature stability of ferroelectric materials are desirable when used for applications in infrared thermal detectors. In this work, we report lead-free ternary 0.97(0.99Bi0.5Na0.5TiO3-0.01BiAlO3)-0.03K0.5Na0.5NbO3 (BNT-BA-KNN) ceramics, which not only exhibits a large pyroelectric coefficient (<italic>p ∼</italic> 3.7 × 10−8 C cm−2 K−1) and figures of merit (<italic>Fi</italic>, <italic>Fv</italic>, and <italic>Fd</italic>) but also shows excellent thermal stable properties. At room temperature, <italic>Fi</italic>, <italic>Fv</italic>, and <italic>Fd</italic> are determined as high as 1.32 × 10−10 m/V, 2.89 × 10−2 m2/C, and 1.15 × 10−5 Pa−1/2 at 1 kHz and 1.32 × 10−10 m/V, 2.70 × 10−2 m2/C, and 1.09 × 10−5 Pa−1/2 at 20 Hz, respectively. During the temperature range of RT to 85 °C, the achieved <italic>p</italic>, <italic>Fi</italic>, <italic>Fv</italic>, and <italic>Fd</italic> do not vary too much. The high depolarization temperature and the undispersed ferroelectric-ergodic relaxor phase transition with a sharp pyroelectric coefficient peak value of ∼400 × 10−8 C cm−2 K−1 are suggested to be responsible for this thermal stability, which ensures reliable actual operation. The results reveal the BNT-BA-KNN ceramics as promising lead-free candidates for infrared thermal detector applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 112
- Issue :
- 14
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 128917788
- Full Text :
- https://doi.org/10.1063/1.5020424