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 1 2002

Keywords

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

ASJC Scopus subject areas

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

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