Effect of crystallographic orientation on transparency of alumina prepared using magnetic alignment and SPS

Takaharu Ashikaga, Byung Nam Kim, Hajime Kiyono, Tohru S. Suzuki

Research output: Contribution to journalArticle

7 Citations (Scopus)


Transparent polycrystalline alumina was developed over many years because its attractive properties are expected to find applications in many fields. Crystallographic orientation is one of the effective ways to improve transparency in birefringent ceramics such as alumina, because birefringence at grain boundaries can be suppressed by the alignment of optical axis. Fabrication of high-transparency alumina with an oriented c-axis and fine microstructure can be attained by slip casting in a strong magnetic field, followed by spark plasma sintering at 1150 °C for 20 min. The real in-line transmittance of the textured alumina with a thickness of 0.80 mm was 70% at λ = 640 nm, which was higher than that of randomly-oriented alumina. The c-axis orientation reduced the actual difference of the refractive index and suppressed remarkably the birefringence.

Original languageEnglish
Pages (from-to)2735-2741
Number of pages7
JournalJournal of the European Ceramic Society
Issue number7
Publication statusPublished - 2018 Jul 1



  • Birefringence
  • Index differences
  • Scattering coefficient
  • Strong magnetic field

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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