Cation substitution for BaTiO3phase in low-fired glass-ceramics for tunable microwave applications

Junichi Takahashi, Keisuke Kageyama, Hajime Kiyono, Hiroshi Nakano, Hidenobu Itoh

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Cation substitution for the Ba2+ and Ti4+ sites in the BaTiO3 structure was attempted in low-fired glass-ceramics derived from glass powders that have perovskite phase compositions corresponding to (BaTiO3 : REAlO3) = 9:1 and 8:2 (RE = La, Nd and Sm) to control the Curie temperature (7C) of the ferroelectric glass-ceramics. The La3+-substituted (9:1) sample heated at 950°C for 24 h showed a broadened εr-temperature relationship with substantial lowering in Tc to ∼-55°C. The Ba:La ratio in the perovskite particles was estimated to be in the range of 4:1-6.7:1, whereas very little A13+ was incorporated into the same particles. It was found that the Tc of the glass-ceramics fabricated in our serial study could be adjusted by A-site cation substitution in BaTiO3. Tailored glass-ceramic samples with room temperature εr of 200-300 and Tc of around 0&C had good microwave tunability of 30-40% under dc bias voltage of 10-50kV/cm. The high tuning sensitivity of the low-fired glassceramics was confirmed by comparative examination of the dielectric properties of well-crystallized ceramics and thin films.

Original languageEnglish
Pages (from-to)7089-7093
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume44
Issue number9 B
DOIs
Publication statusPublished - 2005 Sep 22
Externally publishedYes

Fingerprint

Glass ceramics
Substitution reactions
Positive ions
Microwaves
ceramics
substitutes
microwaves
cations
glass
Perovskite
Curie temperature
Bias voltage
Phase composition
Dielectric properties
Ferroelectric materials
Tuning
dielectric properties
Powders
Glass
Thin films

Keywords

  • BaTiO phase
  • Cation substitution
  • Dielectric properties
  • Glass-ceramics
  • Lanthanide cations
  • Microwave tunability

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Cation substitution for BaTiO3phase in low-fired glass-ceramics for tunable microwave applications. / Takahashi, Junichi; Kageyama, Keisuke; Kiyono, Hajime; Nakano, Hiroshi; Itoh, Hidenobu.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 44, No. 9 B, 22.09.2005, p. 7089-7093.

Research output: Contribution to journalArticle

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