Production of crystal-oriented lanthanum silicate oxyapatite ceramics with anisotropic electrical conductivity and thermal expansion

Kiyoshi Kobayashi*, Kenya Hirai, Tetsuo Uchikoshi, Yoshio Sakka, Takaya Akashi, Tohru S. Suzuki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Lanthanum silicate oxyapatite (LSO) has a very high oxide-ion conductivity along the c-axis of its hexagonal crystal. The effect of the crystal orientation in LSO ceramics on the anisotropy of their electrical and mechanical properties has not been studied systematically because centimeter-scale ceramics with different degrees of crystal orientation are difficult to produce. We produced crystal-oriented LSO ceramics by slip casting under a strong magnetic field and subsequent sintering. Using LSO ceramics with different degrees of crystal orientation, the electrical conductivity (σ) and linear thermal expansion coefficient (α) were measured. σ parallel to the c-axis (σ||c) increased as the degree of crystal orientation increased, whereas σ perpendicular to the c-axis (σ⊥c) was relatively insensitive to this parameter. The σ||c and σ⊥c values of our samples were almost the same as those of LSO single crystals. α also exhibited anisotropy originating from the asymmetry of the crystal structure.

Original languageEnglish
Article number100100
JournalOpen Ceramics
Volume6
DOIs
Publication statusPublished - 2021 Jun
Externally publishedYes

Keywords

  • Anisotropic properties
  • Crystal-oriented ceramics
  • Lanthanum silicate oxyapatite

ASJC Scopus subject areas

  • Biomaterials
  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

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