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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 8, Number 1
January 20, 1987 

Structure Study of Polycrystalline Na3YSi3O9 and Its Substitutes Related to Na4CaSi3O9, Ca3Al2O6 Structure
Chy Hyung Kim*, Ephraim Banks
The study of the Na3YSi3O9 structure, by x-ray diffraction and infrared spectrum, showed that Na3YSi3O9 is similar to Na4CaSi3O9 except for its being pseudo-cubic instead of cubic. The peaks in the x-ray diffraction pattern of Na3YSi3O9 could therefore be indexed on the basis of the Na4CaSi3O9 cell. Also, modified Na3MSi3O9 (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 Na3.2M0.7Si2.9P0.1O8.7 were estimated from x-ray powder diffraction patterns using the Cohen method.
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