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Mesoporous fibrous silicon nitride by catalytic nitridation of silicon

AuthorsMinasyan, Tatevik; Liu, Le; Aghayan, Marina; Rodríguez, Miguel A. CSIC ORCID; Aydinyan, Sofiya; Hussainova, Irina
KeywordsMesoporous substrate
Silicon nitride
Catalytic nitridation
Issue Date2019
CitationProgress in Natural Science
Abstract[EN] The catalytic effect of metal oxide/alumina whiskers (CeO2,Mn3O4, NiO, Co3O4,Fe2O3,Cr2O3/AW) was eval-uated on their ability to drive the nitridation of silicon and to generate mesoporousfibrous silicon networks.Silicon powder with different particles size along with the catalyst was nitridized at 1300 °C for 5 h in nitrogenand nitrogen diluted with 10 vol% ammonia atmospheres. Nitridation degree of silicon up to 99% was recordedusing 1.5 wt% CeO2and Fe2O3catalysts in nitrogen-ammonia atmosphere. The catalyzed samples containsubmicronic silicon nitridefibres with a diameter of 400–500 nm and a length of up to few micrometers. Thecompressive strength of 46 ± 1 MPa was measured for silicon samples catalyzed with nickel oxide/aluminawhiskers and nitridized in N2/10 vol%NH3atmosphere. Porous silicon nitride networks were produced with45–52% porosity, pore sizes in the range of 370–1200 nm and median pore in the range of 495–1655 nm.
Publisher version (URL)http://dx.doi.org/10.1016/j.pnsc.2019.03.017
Identifiersdoi: 10.1016/j.pnsc.2019.03.017
issn: 1002-0071
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