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Phase relationships in neodymia and ytterbia containing SiAlONs

Holzer, Stefan; Geßwein, Holger; Hoffmann, Michael Johannes

Abstract:
The Si3N4-rich corner of the phase diagrams for neodymia and ytterbia
containing sialons has been investigated by a systematic variation of
the m and n values for compositions between 0.5 and 2.0 with a step
size of 0.5. Samples requiring nitrides of the rare earth elements have
not been prepared. Sintering has been performed at 1800degreesC for one
hour in a nitrogen atmosphere of 1 MPa. The sintered samples were
characterized by X-ray diffraction analysis to identify the crystalline
phases in equilibrium with sialon. alpha- and beta-sialon, the 21R AlN
polytypoid, and N-melilite M' were found in the Nd containing system.
Materials with Yb showed the formation of alpha- and beta-sialon, and
the AIN polytypoids; 12H and 21R. The m and n values of the
alpha-sialon phase have been calculated via their lattice parameters
that were refined by a least squares routine. The occurence and
composition of the phases were used-to outline their stability region.


Zugehörige Institution(en) am KIT Institut für Keramik im Maschinenbau (IKM)
Publikationstyp Zeitschriftenaufsatz
Jahr 2003
Sprache Englisch
Identifikator ISSN: 0252-1059
KITopen ID: 1000000564
Erschienen in Key engineering materials
Band 237
Seiten 43-48
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