Enhanced pyroelectric response is achieved via domain engineering from  grain-oriented, tetragonal-phase, lead-free 0.2(2/3K0.5Bi0.5TiO3-1/3BaTiO3)-0.8Na0.5Bi0.5TiO3 (KBT-BT-NBT) ceramics prepared by a templated grain growth method. The  crystallographic orientation leads to large polarization in tetragonal symmetry; therefore, texturing along this direction is employed to enhance the pyroelectricity. X-ray diffraction analysis revealed a Lotgering factor (degree of texturing) of 93 % along the  crystallographic direction. The textured KBT-BT-NBT lead-free ceramics showed comparable pyroelectric figures of merit to those of lead-based ferroelectric materials at room temperature (RT). In addition to the enhanced pyroelectric response at RT, an enormous enhancement in the pyroelectric response (from 1750 to 90,900 μC m−2 K−1) was achieved at the depolarization temperature because of the sharp ferroelectric to antiferroelectric phase transition owing to coherent 180° domain switching. These results will motivate the development of a wide range of lead-free pyroelectric devices, such as thermal sensors and infra-red detectors.
|Original language||English (US)|
|Number of pages||9|
|Journal||Journal of the European Ceramic Society|
|State||Published - Apr 2021|
Bibliographical noteFunding Information:
This study was supported by the National Research Council of Science & Technology (NST) grant by the Korean government (MSIP) (No. CAP-17-04-KRISS ), the National Research Foundation of Korea ( NRF-2019R1A2B5B01070100 ) and “ Human Resources Program in Energy Technology ” of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) , and granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20174030201800 ). H.-C. Song acknowledges the support from the National R&D Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT ( NRF-2020M3H4A3105594 ), and the Energy Technology Development Project (KETEP) grant funded by the Ministry of Trade, Industry and Energy, Republic of Korea ( 2018201010636A ) and the Korea Institute of Science and Technology ( 2E30410 ). K.-H. Cho acknowledges the support from the National Research Foundation (NRF) of Korea funded by the Ministry of Education ( NRF-2018R1A6A1A03025761 and NRF-2019R1I1A3A01058105 ) and the Ministry of Science and ICT (MSIT) of Korea ( IITP-2020-2020-0-01612 ). S.P. acknowledges the financial support from the National Science Foundation through award number 1936432.
© 2020 Elsevier Ltd
- Ferroelectric phase transition
- Lead-free material
- Template grain growth