http://www.cnr.it/ontology/cnr/individuo/prodotto/ID251900
Structural Data from X-ray Powder Diffraction of a New Phase Formed in the Si3N4-La2O3-Y2O3 System After Oxidation in Air (Articolo in rivista)
- Type
- Label
- Structural Data from X-ray Powder Diffraction of a New Phase Formed in the Si3N4-La2O3-Y2O3 System After Oxidation in Air (Articolo in rivista) (literal)
- Anno
- 1999-01-01T00:00:00+01:00 (literal)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- F. Monteverde, G. Celotti (literal)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
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- Titolo
- Structural Data from X-ray Powder Diffraction of a New Phase Formed in the Si3N4-La2O3-Y2O3 System After Oxidation in Air (literal)
- Abstract
- A new phase formed at high temperature with composition (Y2/3La1/3)2Si2O7 was found among the reaction products of a hot pressed Si3N4-based
material (with Y2O3 and La2O3 as sintering aids) after oxidation experiments. This phase was also directly synthesized from oxide precursors (SiO2,
Y2O3, La2O3) at 1600C, under the condition of a silica excess. After identifying a proper monoclinic cell, the structure of such a compound was success
fully refined by Rietveld method starting from the existing model of G-form of La2Si2O7. The new phase turned out to be isostructural with it, showing
however a characteristic inhomogeneous substitution of Y atoms by La ones in only half the cell positions and a rather distorted arrangement of Si±O tetrahedra. (literal)
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