Effect of Mg loading on the high-frequency tunability of Ba0.8Sr0.2TiO3 ceramics

Takashi Teranishi, Tsuyoshi Sogabe, Hidetaka Hayashi, Akira Kishimoto, Kengo Iokibe, Yoshitaka Toyota

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The effect of Mg loading on the high-frequency tunable properties and dielectric loss of Ba0.8Sr0.2Ti1-xMgxO3 (BSTM) ceramics was investigated. Variation in the lattice parameters and the 90° domain configuration with Mg loading indicated a decrease in the tetragonal distortion. Additionally, the 90° domain size decreased slightly with a low Mg loading, up to 0.1 mol %, resulting in a higher domain-wall density compared with the nondoped specimen. The 0.075 mol% Mg-loaded BSTM ceramic exhibited the highest tunability; this was attributed to the domain-size effect. The loss tangent (tan δ) roughly decreased with Mg loading, due to loaded oxygen vacancies. The maximum figure of merit value (FOM = tunability/tan δ) at 10MHz was achieved for the 0.075 mol% Mg specimen, twice that of the non-doped specimen, due to an increase in the tunability and a decrease in the loss tangent with Mg loading.

Original languageEnglish
Number of pages1
JournalJapanese Journal of Applied Physics
Volume54
Issue number1
DOIs
Publication statusPublished - Jan 1 2015

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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