Characterization of Transparent Fluorapatite Ceramics Fabricated by Spark Plasma Sintering

Hiroaki Furuse*, Daichi Kato, Koji Morita, Tohru S. Suzuki, Byung Nam Kim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Highly optically transparent polycrystalline fluorapatite ceramics with hexagonal crystal structures were fabricated via a liquid-phase synthesis of fluorapatite powder, followed by spark plasma sintering (SPS). The effect of sintering temperature, as observed using a thermopile, on the optical transmittance and microstructure of the ceramics was investigated in order to determine suitable sintering conditions. As a result, high optical transmittance was obtained in the SPS temperature range of 950–1100 °C. The highest optical transmittance was obtained for the ceramic sample sintered at 1000 °C, and its average grain size was evaluated at only 134 nm. The grain size dramatically increased with temperature, and the ceramics became translucent at SPS temperatures above 1200 °C. The mechanical and thermal properties of the ceramics were measured to evaluate the thermal shock parameter, which was found to be comparable to or slightly smaller than that of single-crystal fluorapatite. This transparent polycrystalline fluorapatite ceramic material should prove useful in a wide range of applications, for example as a biomaterial or optical/laser material, in the future. Furthermore, the knowledge obtained in this study should help to promote the application of this ceramic material.

Original languageEnglish
Article number8157
Issue number22
Publication statusPublished - 2022 Nov
Externally publishedYes


  • fine microstructure
  • fluorapatite
  • spark plasma sintering
  • transparent ceramics

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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