Ultrahigh dielectric permittivity in oxide ceramics by hydrogenation

Authors
Duong, Nguyen XuanJang, Ji-SooJung, Min-HyoungBae, Jong-SeongAhn, Chang WonJin, Jong SungIhm, KyuwookKim, GyehyeonLim, So YeonLee, JongminDung, Dang DucLee, SoonilKim, Young -MinLee, SanghanYang, Sang MoSohn, ChangheeKim, Ill WonJeong, Hu YoungBaek, Seung-HyubKim, Tae Heon
Issue Date
2023-02
Publisher
American Association for the Advancement of Science
Citation
Science Advances, v.9, no.8
Abstract
Boosting dielectric permittivity representing electrical polarizability of dielectric materials has been considered a keystone for achieving scientific breakthroughs as well as technological advances in various multifunctional devices. Here, we demonstrate sizable enhancements of low-frequency dielectric responses in oxygen-deficient oxide ceramics through specific treatments under humid environments. Ultrahigh dielectric permittivity (similar to 5.2 x 10(6) at 1 Hz) is achieved by hydrogenation, when Ni-substituted BaTiO3 ceramics are exposed to high humidity. Intriguingly, thermal annealing can restore the dielectric on-state (exhibiting huge polarizability in the treated ceramics) to the initial dielectric off-state (displaying low polarizability of similar to 10(3) in the pristine ceram-ics after sintering). The conversion between these two dielectric states via the ambient environment-mediated treatments and the successive application of external stimuli allows us to realize reversible control of dielectric relaxation characteristics in oxide ceramics. Conceptually, our findings are of practical interest for applications to highly efficient dielectric-based humidity sensors.
Keywords
PERFORMANCE COLOSSAL PERMITTIVITY; CRYSTAL-STRUCTURE; BATIO3; HUMIDITY; SPECTROSCOPY; IMPEDANCE; CONSTANT; SENSORS; POLARIZATION; CACU3TI4O12
ISSN
2375-2548
URI
https://pubs.kist.re.kr/handle/201004/113999
DOI
10.1126/sciadv.add8328
Appears in Collections:
KIST Article > 2023
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