Abstract
Substitution characteristics of the halide ions F − Cl − for the OH − ions in the crystal lattice of 12CaO·7Al 2O 3 solid solution were investigated. Single phases of composition 11CaO·7Al 2O 3·CaF 2 and 11CaO·7Al 2O 3·CaCl 2 were formed at 900 °C or above. The OH − ions in 12CaO·7Al 2O 3 solid solution, i.e. 11CaO·7Al 2O 3·Ca(OH) 2, could be replaced wholly or partially by F − or Cl − ions from the corresponding calcium halide, forming 11CaO·7Al 2O 3·Ca(OH,F) 2 and 11CaO·7Al 2O 3·Ca(OH,Cl) 2 solid solutions above 500 °C and above 700 °C, respectively. Lattice constants of 12CaO·7Al 2O 3 solid solution changed continuously with the proportion of F − ions or Cl − ions. The F − ions in 11CaO·7Al 2O 3·CaF 2 could be wholly or partially substituted by Cl − ions from CaCl 2 at 900 °C or more, forming the solid solution 11CaO·7Al 2O 3·Ca(F,Cl) 2. The Cl − ions in 11CaO·7Al 2O 3·CaCl 2 could be partially replaced F − ions from CaF 2 at 1000 °C or above, apparently due to slow chloride loss by evaporation.
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