Impact of the change in charge compensation mechanism on the electrical, dielectric, and structural properties of La-doped BaTiO3 ceramics

Authors
Hwang, Seong-MeeLim, Jong-ChanKim, Sang-ilKim, Jeong-YeonHwang, JihyunLee, Chung-hyunKwon, NamheeKim, InseoLee, KimoonPark, SoohyungBae, Seung-MukHwang, Jin-HaLee, KiyoungKim, Hyun-Sik
Issue Date
2024-08
Publisher
Elsevier BV
Citation
Journal of the European Ceramic Society, v.44, no.9, pp.5471 - 5479
Abstract
La-doped BaTiO3 ceramics are essential materials in electronic devices, finding applications in multilayer ceramic capacitors and positive temperature coefficient thermistors. While the electrical properties of La-doped BaTiO3 have been investigated, the impact of its room-temperature resistivity anomaly on dielectric properties remains unclear. We synthesized pristine and La-doped BaTiO3 (0.1 - 0.5 mol%) powders via hydrothermal methods, and then sintered bulk samples. Their resistivities (DC and AC), Curie temperature, room-temperature dielectric constant, and lattice volume with varying La doping concentrations were characterized. Beyond 0.3 mol%, the shift from electronic to ionic charge compensation mechanisms resulted in abrupt changes in resistivities, Curie temperature, and dielectric constant near 0.3 mol%. Given minimal changes in average grain size and relative density near 0.3 mol% La, the dominant factor influencing the dielectric constant peaking near this concentration was the shift in charge compensation mechanism.
Keywords
BARIUM-TITANATE; HYDROTHERMAL SYNTHESIS; CRYSTAL-STRUCTURE; POWDERS; SIZE; TEMPERATURE; BEHAVIOR; PARTICLE; DY; La -doped BaTiO 3; Multilayer ceramic capacitor; Resistivity; Dielectric constant; Charge compensation
ISSN
0955-2219
URI
https://pubs.kist.re.kr/handle/201004/149943
DOI
10.1016/j.jeurceramsoc.2023.12.029
Appears in Collections:
KIST Article > 2024
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