Structural and dielectric properties of nickel-doped and lanthanum-chromium-doped barium titanate ceramics

Mamoru Fukunaga, L. I. Guobao, Yoshiaki Uesu, Kay Kohn

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Nickel-doped BaTiO3 (BaTi1-xNiyO 3-δ: BTN) and lanthanum-chromium double-doped BaTiO3 (Ba1-xLaxTi1-xCrxO3: BLTC) ceramics were synthesized and their symmetry and dielectric properties were studied. Samples were sintered at 1400°C in air from stoichiometric amounts of BaCO3 and other metal oxides. X-ray diffraction data were obtained at 20°C. Dielectric properties were measured in the temperature range of 78 K to 453 K. With the increase of dopant ratio y, Curie temperature TC of BTN decreases, but when y exceeds about 0.01, a hexagonal phase appears and the dielectric constant becomes smaller. On the other hand, in the entire range of x, BLTC shows a perovskite structure and the compounds with larger x exhibit conductive rhombohedral or orthorhombic phases. In the range of x smaller than 0.1, BLTC shows a diffuse phase transition and a high dielectric constant with small tan δ. The relaxor-like frequency dispersion was observed in BLTC at low temperatures.

Original languageEnglish
Pages (from-to)6926-6928
Number of pages3
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume41
Issue number11 B
DOIs
Publication statusPublished - Nov 2002
Externally publishedYes

Fingerprint

Barium titanate
Lanthanum
lanthanum
Dielectric properties
barium
dielectric properties
Structural properties
chromium
Chromium
Permittivity
Nickel
nickel
ceramics
permittivity
Curie temperature
Perovskite
metal oxides
Phase transitions
Doping (additives)
X ray diffraction

Keywords

  • Barium titanate
  • Ceramics
  • Complex perovskite
  • Ferroelectrics
  • Relaxor

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Structural and dielectric properties of nickel-doped and lanthanum-chromium-doped barium titanate ceramics. / Fukunaga, Mamoru; Guobao, L. I.; Uesu, Yoshiaki; Kohn, Kay.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 41, No. 11 B, 11.2002, p. 6926-6928.

Research output: Contribution to journalArticle

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