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Witold Lojkowski Aharon Gedanken Ewa Grzanka Agnieszka Opalinska Tomasz Strachowski Roman Pielaszek Anita Tomaszewska-Grzeda Sergyi Yatsunenko Marek Godlewski Hubert Matysiak Krzysztof J. Kurzyd?owski 《Journal of nanoparticle research》2009,11(8):1991-2002
ZnO nanopowders doped with Mn2+, Ni2+, Co2+ and Cr3+ ions have been synthesised for the first time using a solvothermal reaction with microwave heating. The nanopowders were produced from a solution of zinc acetate and manganese (II), chromium (III), nickel (II) and cobalt (II) acetates, using ethylene glycol as a solvent. The content of Ni2+, Co2+ and Cr3+ ions in the solution and in the solid phase were close to each other up to 5 mol%. The doping level of Mn2+ ions in the solid is about 50% of that in the solution. No phases or compounds other than ZnO were detected by X-ray diffraction with Mn2+, Co2+ and Ni2+ doping. With Cr3+ ions a small amount of chromium oxide was found. None of the powders displayed any luminescence after doping. The Mn2+-doped powder displayed a paramagnetic behaviour. ESR and magnetisation investigations have revealed that no clustering of Mn2+ ions occurred up to a doping level of 3.9 mol%. The average grain size of powders doped with Ni2+, Cr3+, Co2+ and Mn2+ for a 10 mol% ion content in the solution was about 20 nm and the grain size dispersion 30%. With increasing dopant content the grain size decreased. It appears that the solvothermal process employed allows relatively high doping levels of the transition metal ions to be achieved without any dopant clustering or oxide precipitation. 相似文献
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Szafran M. Jach K. Tomaszewska-Grzeda A. Rokicki G. 《Journal of Thermal Analysis and Calorimetry》2003,74(2):639-646
Direct Coagulation Casting (DCC) method was applied for an alumina powder molding. In the paper the results of studies on
the application of the reaction of acetic acid generation from glycerol triacetate catalyzed by lipase PPL for the flocculation
of ceramic slips are presented. The ceramic samples obtained according this method were homogenous of a low content of organic
binder (below 0.5 mass%), high tensile strength in the green state (>1 MPa) and high uniformity of thickening and a uniform
structure.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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