Stability of cuspidine (3CaO·2SiO2·CaF2) and phase relations in the CaO-SiO2-CaF2 system

Takashi Watanabe, Hiroyuki Fukuyama, Kazuhiro Nagata

Research output: Contribution to journalArticlepeer-review

75 Citations (Scopus)


Primary crystallization field of cuspidine (3CaO·2SiO2·CaF2) has been experimentally determined in the 2CaO·SiO2-SiO2-CaF2 system by quenching method and differential thermal analysis (DTA). Hermetically closed platinum capsules were used as a sample container to prevent fluorine loss in the form of HF and SiF4 by reaction of CaF2 with moisture or SiO2 for quenching experiments. Combining the present study with the partial phase diagrams previously reported, the whole phase diagram of the CaO-SiO2-CaF2 system has been developed. Cuspidine equilibrates with (2CaO·SiO2)2CaF2, CaO·SiO2, 3CaO·2SiO2, 2CaO·SiO2 and CaF2 in solid state. Cuspidine coexists with liquid phases at temperatures between 1387 K and 1680 K.

Original languageEnglish
Pages (from-to)489-497
Number of pages9
JournalIsij International
Issue number5
Publication statusPublished - 2002
Externally publishedYes


  • CaSiOF
  • CaSiOF
  • CaO-SiO -CaF
  • Cuspidine
  • Mold powder
  • Phase diagram
  • Phase equilibria

ASJC Scopus subject areas

  • Metals and Alloys


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