Phase transformation and sintering behavior of Ca2P 2O7

Jian Jiang Bian, Dong Wan Kim, Kug Sun Hong

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The phase transformation and sintering behaviors of Ca2P 2O7 with different phase composition were investigated by using X-ray powder diffraction (XRD), dilatometery and scan electron microscopy techniques in this paper. It is found that although α-Ca2P 2O7 (high-temperature form) could be kept during its cooling process, it is metastable and retransformed into β-Ca 2P2O7 (low-temperature form) at about 950 °C during its reheating process. This reversible phase transformation was discussed from the point view of polyhedral distortion. The sample from β-Ca2P2O7 calcined at 1000 °C/2 h densifies much faster than that from α-Ca2P2O 7 and α + β mixture, and bulk density as high as 98% TD can be obtained as it is sintered at 1150 °C. A dense α-Ca 2P2O7 free of micro-crack could not be obtained whatever from the powder of β-Ca2P2O 7 or α-Ca2P2O7 or α + β mixture. Such different sintering behavior was explained in related to the reversible phase transformation between α- and β-Ca 2P2O7.

Original languageEnglish
Pages (from-to)347-351
Number of pages5
JournalMaterials Letters
Volume58
Issue number3-4
DOIs
Publication statusPublished - 2004 Jan
Externally publishedYes

Keywords

  • CaPO
  • Phase transformation
  • Sintering behavior

ASJC Scopus subject areas

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

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