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|Title:||Nanohybrids of non-stoichiometric zinc ferrite in amorphous silica|
|Authors:||Zhou, Z.H. |
|Citation:||Zhou, Z.H., Wang, J., Xue, J.M., Chan, H.S.O. (2001). Nanohybrids of non-stoichiometric zinc ferrite in amorphous silica. Journal of Materials Chemistry 11 (12) : 3110-3115. ScholarBank@NUS Repository. https://doi.org/10.1039/b105427a|
|Abstract:||Nanohybrids containing non-stoichiometric zinc ferrite of spinel structure in an amorphous silica matrix exhibit a fundamentally different structure to that formed by stoichiometric zinc ferrite. A unique cluster glass structure, where nanocrystallites of zinc ferrite exist in amorphous Fe-rich pockets, occurred at the significantly high Fe/Zn molar ratio of 10, as supported by the magnetic behaviour and characterisation by XRD and TEM. The occurrence of zinc ferrite crystallites due to the Zn2+ deficiency, together with the confinement of the silica matrix, suppresses the nucleation and crystallisation of α-Fe2O3 to a temperature above 900°C, preserving the cluster glass structure. The Fe/Zn molar ratio also affects the optical properties of nanohybrids consisting of the zinc ferrite nanophase in amorphous silica, which demonstrate a high absorption coefficient to yellow light. The absorption edge was blue-shifted by 0.25 eV when the Fe/Zn ratio was increased from 2 to 10.|
|Source Title:||Journal of Materials Chemistry|
|Appears in Collections:||Staff Publications|
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