Study on Lattice Parameters of (Ca,Mg)- α-Sialon

Abstract

Abstract: By using Guinier-Hagg camera, computer-linked scanner system and associated programs, the lattice parameters of α-Sialon for the
compositions (Ca_0.5Mg_0.5)_xSi_3-xAl_xO_xN_16-x with x ranging from 0.3 to 1.4 were determined. The samples were prepared by hot pressing technique. The
results showed that the crystalline phases in the sintered materials consist of α-Sialon and Mg-containing AlN-polytypoid when x is equal to or
greater than 1.0 and the lattice parameters of (Ca,Mg)-α-Sialon are obviously smaller than Ca-α-Sialon with the same compositions. EDAX
results further revealed that 90% of added Ca⁺⁺ and small amount of Mg⁺⁺ are incorporated into α-Sialon. This result combined with
the fact of formation of magnesium-containing AlN-polytypoid phase in (Ca,Mg)-α-Sialon samples can provide a valid approach to reduce the
amount of glassy phase at the grain boundary.

Key words: Ca, Mg, Sialon, AlN-polytypoid, lattice parameters

CLC Number:

TB323

WANG Pei-Ling,JIA Ying--Xin,ZHANG Cheng,SUN Wei-Ying. Study on Lattice Parameters of (Ca,Mg)- α-Sialon[J]. Journal of Inorganic Materials.

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Study on Lattice Parameters of (Ca,Mg)- α-Sialon

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