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Publikācija: Study of Defects by Rietveld Technique and Gas Sensing Properties of Non-Stoichiometric Zinc Ferrite

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Nosaukums oriģinālvalodā Study of Defects by Rietveld Technique and Gas Sensing Properties of Non-Stoichiometric Zinc Ferrite
Pētniecības nozare 2. Inženierzinātnes un tehnoloģijas
Pētniecības apakšnozare 2.5. Materiālzinātne
Autori Andris Šutka
Nicola Doebelin
Gundars Mežinskis
Atslēgas vārdi Spinel zinc ferrite, Rietveld, gas sensor
Anotācija Our previous study has shown that by regulating excess iron content in spinel zinc ferrite it is possible to enhance its gas response.1) In this work relationships between structural properties and gas response of the non-stoichiometric zinc ferrites were studied. Stoichiometric and excess iron spinel zinc ferrite nanomaterials were synthesized by using sol-gel combustion. Rietveld refinement of site occupancies from powder XRD data shows that excess iron zinc ferrites contain vacancies on oxygen positions, Fe2+ on octahedral crystallographic sites, and Fe3+ on the tetrahedral site.. As revealed by complex impedance spectra, with increasing oxygen vacancy concentration the depletion layer width decreases. At the same time, with increasing oxygen vacancy concentration increases oxygen adsorption for reaction with a test gas, thus increasing the gas response of spinel zinc ferrite. Long term stability of the non-stoichiometric excess iron spinel zinc ferrite gas sensors also was not studied previously and will be discussed in this work.
Atsauce Šutka, A., Doebelin, N., Mežinskis, G. Study of Defects by Rietveld Technique and Gas Sensing Properties of Non-Stoichiometric Zinc Ferrite. No: The 11th International Conference on Ferrites (ICF 11): Proceedings, Japāna, Okinawa, 15.-19. aprīlis, 2013. Okinawa: 2013, 1.-1.lpp.
Pilnais teksts
ID 16510