ISSN:
1662-9752
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
Oxygen/nitrogen (O/N) configuration in RE-J-phase, RE4Si2O7N2 (RE = rare earthelement), was simulated by the Monte Carlo method applied to O/N distribution models. Proportionof local structures of Si2(O,N)7 ditetrahedra and Si(O,N)4 tetrahedra in the J-phase was quantitativelyassessed. For the Lu-J-phase model with the bridging site between two Si atoms being occupied bynitrogen atom, the Si2(O,N)7 ditetrahedra composed of O3≡Si–N–Si≡O2N (〉 40 %), O3≡Si–N–Si≡O3(c.a. 30 %), and O2N≡Si–N–Si≡O2N(c.a. 15 %). Tetrahedra of SiO3N and SiO2N2 were dominant andsmall amount of SiON3 tetrahedra coexisted. For La-J-phase model with the O/N occupancy of0.1/0.9 at the bridging site, configurations of O3≡Si–O–Si≡O2N (c.a. 5%), O3≡Si–O–Si≡O3 (c.a. 3%),and O2N≡Si–O–Si≡O2N (c.a. 2%) were demonstrated in addition to the three configurations ofditretrahedra recognized in the Lu-J-phase. In La-J-phase coexistence of SiO4 tetrahedra waspresented
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.554.43.pdf
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