RTU Research Information System
Latviešu English

Publikācija: Gas Sensitivity of Stoichiometric and Excess-Iron Ni-Zn Ferrite Prepared by Sol-Gel Auto-Combustion

Publication Type Scientific article indexed in SCOPUS or WOS database
Funding for basic activity Unknown
Defending: ,
Publication language English (en)
Title in original language Gas Sensitivity of Stoichiometric and Excess-Iron Ni-Zn Ferrite Prepared by Sol-Gel Auto-Combustion
Field of research 2. Engineering and technology
Sub-field of research 2.5 Materials engineering
Authors Andris Šutka
Gundars Mežinskis
Gundars Strīķis
Andrejs Šiškins
Keywords
Abstract Application of new materials offers more sensitive, selective and long-term stable sensor materials. The aim of the present work is to compare gas response to acetone of nanostructured sol-gel auto-combustion derived stoichiometric and excess-iron cubic spinel type nickel-zinc ferrite (Ni0.3Zn0.7Fe2+zO4 where z = 0 and 0.1). Detailed synthesis steps and gas sensing measurement methodology were described. The sensor material was characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM) and direct current (DC) resistance measurements. XRD analysis confirms that samples form the single-phased cubic spinel structure, SEM reveals nanosized grains less than 100 nm in diameter. Plots of resistance versus temperature show adsorbed water contribution to the conductance. With excess-iron, Ni-Zn ferrite changes its DC electrical resistivity, type of conductivity, as well as response to reducing gas (more than 2 times). Obtained relationships can be explained with Fe2+ formation in the material, thus increasing charge carrier (electron) concentration. This leads down to higher oxygen adsorption ability which can act with test gas.
DOI: 10.6001/energetika.v58i3.2467
Hyperlink: http://lmaleidykla.lt/ojs/index.php/energetika/article/view/2467 
Reference Šutka, A., Mežinskis, G., Strīķis, G., Šiškins, A. Gas Sensitivity of Stoichiometric and Excess-Iron Ni-Zn Ferrite Prepared by Sol-Gel Auto-Combustion. Energetika, 2012, Vol.58, No.3, pp.166-172. ISSN 0235-7208. e-ISSN 1822-8836. Available from: doi:10.6001/energetika.v58i3.2467
Additional information Citation count:
  • Scopus  0
ID 14976