Sintering behavior and microwave dielectric properties of tricalcium phosphate polymorphs

In Sun Cho, Hyun Seung Ryu, Jeong Ryeol Kim, Dong Wan Kim, Kug Sun Hong

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


The phase transformation and sintering behavior of tricalcium phosphate polymorphs [β- and α-Ca3(PO4)2] are investigated using differential thermal analysis, X-ray powder diffraction, and dilatometry. The low-temperature phase, β-Ca3(PO 4)2, can be sintered at 1125°C prior to phase transformation to α-Ca3(PO4)2. However, it is difficult to obtain dense α-Ca3(PO4) 2 samples owing to volume expansion and subsequent microcrack formation during the transformation of β-Ca3(PO 4)2 to α-Ca3(PO4)2. Herein, we develop α-Ca3(PO4)2 with a density higher than 97% by microwave heating α-Ca3(PO 4)2 without any reversible phase transformation. Also, we initially explore the microwave dielectric properties of tricalcium phosphate. Both tricalcium phosphate polymorphs show dielectric constants lower than 10. Of importance is the fact that a dense α-Ca3(PO4) 2 sample has a high quality factor of 22,000 GHz.

Original languageEnglish
Pages (from-to)2999-3003
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number5 A
Publication statusPublished - 2007 May 8
Externally publishedYes


  • Ca(PO)
  • Dielectric properties
  • Microwave
  • Phase transformation
  • Sintering

ASJC Scopus subject areas

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


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