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

Seong Mee Hwang, Jong Chan Lim, Sang il Kim, Jeong Yeon Kim, Jihyun Hwang, Chung hyun Lee, Namhee Kwon, In Seo Kim, Kimoon Lee, Soohyung Park, Seung Muk Bae, Jin Ha Hwang, Kiyoung Lee, Hyun Sik Kim

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

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.

Original languageEnglish
Pages (from-to)5471-5479
Number of pages9
JournalJournal of the European Ceramic Society
Volume44
Issue number9
DOIs
StateAccepted/In press - 2023

Keywords

  • Charge compensation
  • Dielectric constant
  • La-doped BaTiO
  • Multilayer ceramic capacitor
  • Resistivity

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