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Publikācija: Study of Defects by Rietveld Technique and Gas Response of Excess-Iron Zinc Ferrite

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Nosaukums oriģinālvalodā Study of Defects by Rietveld Technique and Gas Response of Excess-Iron Zinc Ferrite
Pētniecības nozare 2. Inženierzinātnes un tehnoloģijas
Pētniecības apakšnozare 2.5. Materiālzinātne
Autori Andris Šutka
Nicola Doebelin
Atslēgas vārdi Zinc ferrite, Rietveld, Gas sensor, Stoichimetry, Sol-gel auto-combustion
Anotācija It has been shown that by regulating excess iron content in spinel zinc ferrite it is possible to enhance its gas response. In this work relationships between structural properties and gas response of the non-stoichiometric zinc ferrites are 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 B sites, and Fe3+ on the A site. As revealed by complex impedance spectra, with increasing oxygen vacancy concentration the depletion layer width decreases. At the same time, 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 will be discussed in this work.
DOI: 10.2497/jjspm.61.S81
Hipersaite: https://www.jstage.jst.go.jp/article/jjspm/61/S1/61_S81/_article 
Atsauce Šutka, A., Doebelin, N. Study of Defects by Rietveld Technique and Gas Response of Excess-Iron Zinc Ferrite. Journal of the Japan Society of Powder and Powder Metallurgy, 2014, Vol.61, No.S1, S81.-S84.lpp. ISSN 0532-8799. e-ISSN 1880-9014. Pieejams: doi:10.2497/jjspm.61.S81
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