| 摘要 |
The invention relates to a new group of nitrogen rich alpha-sialon compositions with the general formula M<SUB>x</SUB>Si<SUB>12(m+n)</SUB>Al<SUB>(m+n)</SUB>O<SUB>n</SUB>N<SUB>16-n</SUB>, where x (=m/v)<=2, v is the average valency of the M cation, and the ratio m/(m+n)>=0.7. The new compositions obtained by this method have one of the following elements M, or combinations thereof, in the cavity of the alpha-sialon structure: Li, Na, Mg, Ca, Sr, Ba, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Th, Pa or U.
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