Impact of the change in charge compensation mechanism on the electrical, dielectric, and structural properties of La-doped BaTiO3 ceramics
- Authors
- Hwang, Seong-Mee; Lim, Jong-Chan; Kim, Sang-il; Kim, Jeong-Yeon; Hwang, Jihyun; Lee, Chung-hyun; Kwon, Namhee; Kim, InSeo; Lee, Kimoon; Park, Soohyung; Bae, Seung-Muk; Hwang, Jin-Ha; Lee, Kiyoung; Kim, Hyun-Sik
- Issue Date
- Aug-2024
- Publisher
- Elsevier Ltd
- Keywords
- Charge compensation; Dielectric constant; La-doped BaTiO<sub>3</sub>; Multilayer ceramic capacitor; Resistivity
- Citation
- Journal of the European Ceramic Society, v.44, no.9, pp 5471 - 5479
- Pages
- 9
- Journal Title
- Journal of the European Ceramic Society
- Volume
- 44
- Number
- 9
- Start Page
- 5471
- End Page
- 5479
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/32435
- DOI
- 10.1016/j.jeurceramsoc.2023.12.029
- ISSN
- 0955-2219
1873-619X
- 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. © 2023 Elsevier Ltd
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