Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Structure Study of Polycrystalline $Na_3YSi_3O_9$ and Its Substitutes Related to $Na_4CaSi_3O_9,\;Ca_3Al_2O_6$ Structure

  • Kim, Chy-Hyung (Department of Electronic Engineering, Chongju University) ;
  • Banks, Ephraim (Department of Chemistry, Polytechnic Institute of New York)
  • Published : 1987.02.20
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Abstract

The study of the $Na_3YSi_3O_9$ structure, by x-ray diffraction and infrared spectrum, showed that $Na_3YSi_3O_9$ is similar to $Na_4CaSi_3O_9$ except for its being pseudo-cubic instead of cubic. The peaks in the x-ray diffraction pattern of $Na_3YSi_3O_9$ could therefore be indexed on the basis of the $Na_4CaSi_3O_9$ cell. Also, modified $Na_3MSi_3O_9$ (M = Lu, Yb, Tm, Er, Y, Ho, Dy, Gd, Eu, and Sm) type compounds were synthesized by introducing excess sodium, decreasing M(III) concentration, and substituting small amount of phosphorus for silicon. The unit cell parameters of the composition $Na_{3.2}M_{0.7}Si_{2.9}P_{0.1}O_{8.7}$ were estimated from x-ray powder diffraction patterns using the Cohen method.

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