This work is focused on the analysis of phase structure and temperature dependences of electric resistivity ρ(Т) in ZnO-based composite ceramics (ZnO)90(FexOy)10, doped with Fe by the addition of 10 wt.% of one of the iron oxides FexOy.
Słowa kluczowe: Electronic transport, electrical properties, ceramics.
Praca koncentruje się na analizie struktury fazowej oraz zależności temperaturowych rezystywności elektrycznej ρ(Т) kompozytów ceramicznych (ZnO)90(FexOy)10 opartych o ZnO, domieszkowanych Fe poprzez dodanie 10% wag. jednego z tlenków żelaza FexOy.
Keywords: Transport elektronowy, właściwości elektryczne, ceramiki
Nowadays special attention is paid to the search for new ceramic materials based on wide-gap oxides, as well as to the study of their structure and properties for the purpose of their application in various areas of the radioengineering, electronic and optoelectronic industries . Analysis of the literature indicates that single crystals, polycrystalline films, nanostructured powders and wires based on ZnO have been studied in sufficient detail. At the same time, ZnO-based compositions, obtained by ceramic technologies, have not been studied so well. In particular, there is no many research dedicated to the effects of ZnO ceramics doping with magnetic impurities as well as influence synthesis technology and subsequent heat treatments on the chemical and phase compositions (including the magnetic states of phases and also the type of self-defects and complexes formed on their basis, and the mechanisms of electrical conductivity of ceramics. The aim of this work is to study the structure and electrical properties of ZnO-based ceramics doped with iron using various types of FexOy doping agents. Experimental The conventional ceramic technology was used to obtain the ZnO-based samples .The initial compounds for the preparation of the charge were high-purity powders of ZnO, and FexOy (FeO, Fe2O3, Fe3O4) oxides. For preparation of the investigated samples we used the compound (ZnO)90(FexOy)10, where the mass of the FexOy powders corresponded to 10 wt. %.The initial powders were milled for one hour in agate mortar with the addition of distilled water and then dried at room temperature. After this 3% (by weight) of PVA glue was added to the powder as a binder, then mixture were mixed and compacted into tablets with press. These tablets were subjecte [...]
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