Large dielectric constants and good thermal stability of Nb2O5-doped BaTiO3–Bi(Mg1/2Ti1/2)O3 ceramics with core–shell structure

Hyeon Min Yu, Su Hwan Go, Seok June Chae, Yeon Gyeong Chae, Eun Ji Kim, Jae Min Eum, Hyun Ryu, Sahn Nahm

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

0.96BaTiO3-0.04Bi(Mg1/2Ti1/2)O3 (0.96BT-0.04BMT) + y wt.% Nb2O5 ceramics (0.0 ≤ y ≤ 2.0) were sintered at 1275 °C to fabricate a ceramic with a large εr for an X8R multilayer ceramic capacitor (MLCC). Addition of Nb2O5 afforded a core–shell structure, and the compositions of the core and shell regions were similar to those of BT and BT-BMT, respectively. The sample (y = 1.25) exhibited a large εr of 2285 with a good temperature stability satisfying the X8R specification because of a broad shell-region phase-transition peak at −17 °C and a decreased εr of the core-region phase-transition peak. The 0.1 wt% BaO–CaO–SiO2 (BCS) was used to reduce the sintering temperature, and the 9-layered MLCC produced using a BCS-doped 0.96BT-0.04BMT + 1.25 wt% Nb2O5 ceramic at 1200 °C showed a large capacitance of 67 nF with a good temperature stability thus complying with EIA-X8R regulations.

Original languageEnglish
Pages (from-to)21695-21707
Number of pages13
JournalCeramics International
Volume49
Issue number13
DOIs
Publication statusPublished - 2023 Jul 1

Bibliographical note

Funding Information:
This study was supported by the Technology Innovation Program of the MOTIE/KEIT grant funded by the Ministry of Trade, Industry & Energy (MOTIE , Korea; Project No. 20010938 , Development of 630 V high-capacity MLCC materials and components for power trains).

Publisher Copyright:
© 2023

Keywords

  • BaTiO and titanates
  • Capacitors
  • Core–shell structure
  • Dielectric properties
  • Powders: solid state reaction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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