The Effect of Barium Sulfate on the Structural Transformations in Tricalcium Silicate

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J. Korean Ceram. Soc. > Volume 11(2); 1974 > Article

Journal of the Korean Ceramic Society 1974;11(2): 17.

3CaO.$SiO_2$의 구조전이에 미치는 $BaSO_4$의 영향

서일영, 최상흘

한양대학교 요업공학과

The Effect of Barium Sulfate on the Structural Transformations in Tricalcium Silicate

ABSTRACT

Miscibility of barium sulfate in tricalcium silicate was investigated by firing 3CaCO3·SiO2 mixture containing barium sulfate at 1530℃. Added amount of barium sulfate to the mixture was zero to 5 mole % with intervals of 1 mole %. Lattice parametres were also calculated. Results were as follow; 1) Dissolution of barium sulfate in tricalcium silicate does not alter the symmetry in room temperature, but influences it's polymorphic transition forms, temperatures and thermal effects; modification triclinic Ⅱ is stabilized in room temperature. 2) Barium sulfate dissolves about up to 2 mole % in tricalcium silicate and more than this amount, tricalcium silicate formation is inhibited. 3) Unit cell volume of tricalcium silicate is slightly decreased with dissolution of barium sulfate, mainly because of contraction in c axis.