Near infrared transmittance of translucent Si3N4 sinteredceramics

Wenwu Yang, Junichi Hojo, Naoya Enomoto, Yumi Tanaka, Miki Inada

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Si3N4 was sintered with AlN-MgO additives by spark plasma sintering. The optical transmittances of sintered bodies were studied in the wavelength range of 0.4-5.5 μm, especially with emphasis on near infrared region. When the additive content was large, the sintered body was composed of α-SiAlON and showed high transmittance in both visible and near infrared regions. When the additive content was small, the sintered body was composed of β-Si3N4 and exhibited high transmittance in visible region but low transmittance in near infrared region. The electron spin resonance spectra indicated that the reduction of near infrared transmittance was due to the absorption by unpaired electrons derived from nitrogen vacancies.

Original languageEnglish
Pages (from-to)155-157
Number of pages3
JournalMaterials Letters
Publication statusPublished - 2013

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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