SALES, T.S.N.BOSCH-SANTOS, B.SAIKI, M.PEREIRA, L.F.CARBONARI, A.W.SAXENA, R.N.BURIMOVA, A.2017-10-252017-10-25SALES, T.S.N.; BOSCH-SANTOS, B.; SAIKI, M.; PEREIRA, L.F.; CARBONARI, A.W.; SAXENA, R.N.; BURIMOVA, A. Determination of Si content in Fe-doped HfSiO4 nanoparticles by neutron activation analysis. In: INTERNATIONAL TOPICAL MEETING ON INDUSTRIAL RADIATION AND RADIOISOTOPE MEASUREMENT APPLICATIONS, 10th, July 09-13, 2017, Chicago, IL, USA. <b>Abstract...</b> p. 76-77. Disponível em: http://repositorio.ipen.br/handle/123456789/27956.http://repositorio.ipen.br/handle/123456789/27956New synthesis method of Fe-doped hafnium silicate nanoparticles (NPs) with tetragonal structure is reported. The procedure implies auto-controlled incorporation of Si from the quartz to the iron-doped hafnium oxide NPs. X-ray diffraction data has shown that lattice parameters of Fe-HfSiO4 thus obtained are very close to those previously known for hafnon. It was established that the hafnon-like phase has stabilized at T=1173K which is ~500K lower than the corresponding transition of bare bulk hafnium silicate. The fractions of Si and Fe in the composite matrix were evaluated via neutron activation analysis (NAA). Delayed gamma NAA results allowed to assume that (i) Fe initially substituted Hf in the HfO2 lattice; (ii) there was no migration of iron atoms from Hf to Si sites throughout the formation of hafnon-like phase; (iii) Fe-doped hafnium oxide has taken as much Si from the quartz as was needed for the arrangement of Fe1-x-Hf x SiO4 tetragonal system. Our results are consistent with those observed for similar materials, such as metal (Fe,V) doped zircon, where metal has also demonstrated catalytic effect on phase stabilization.76-77openAccessResumo de eventos científicoshttps://orcid.org/0000-0002-4499-5949