Determination of gibbs energy of formation of cuspidine (3Cao.2Sio 2.CaF2) by transpiration method

Hiroyuki Fukuyama, Hideki Tabata, Tadayuki Oshima, Kazuhiro Nagata

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11 Citations (Scopus)

Abstract

The standard Gibbs energy change of the following reaction of cuspidine (3CaO · 2SiO2 · CaF2) with water vapor has been determined by a transpiration method as 3CaO · 2SiO2 · CaF2(s) - H2O(g) = 2(2CaO · SiO 2)(s)+2HF(g) ΔrG°/kJ=265-0.116T (±16) (1 22<T/K<1 469) From this result, the standard Gibbs energy of formation of cuspidine has been evaluated as, ΔAfG°(cuspidine)/kJ mor1-1 = -5 178+0.813T(±19) (1 221<T/K<1 469) The constituent activities of the CaO-Si02-CaF2 system and fluorine emission from the system at elevated temperatures have been evaluated based on the obtained thermodynamic data.

Original languageEnglish
Pages (from-to)1488-1493
Number of pages6
JournalIsij International
Volume44
Issue number9
DOIs
Publication statusPublished - 2004

Keywords

  • 3CaO.2SiOCaF
  • CaO-SiO-CaF system
  • Cuspidine
  • Gibbs energy of formation
  • Mold powder
  • Transpiration method

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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