Serga Vera, Burve Regina, Maiorov Mikhail, Krumina Aija, Skaudžius Ramūnas, Zarkov Aleksej, Kareiva Aivaras, Popov Anatoli I
Institute of Solid State Physics, University of Latvia, Kengaraga 8, LV-1063 Riga, Latvia.
Institute of Inorganic Chemistry, Riga Technical University, P. Valdena 3/7, LV-1048 Riga, Latvia.
Materials (Basel). 2020 Sep 17;13(18):4147. doi: 10.3390/ma13184147.
Interest in magnetic nanoparticles is primarily due to their practical use. In this work, for the production of nanocrystalline powders of pure and gadolinium doped iron oxides, the extraction-pyrolytic method (EPM) was used. As a precursor, either iron-containing extract (iron (III) caproate in caproic acid) or its mixture with gadolinium-containing extract (gadolinium (III) valerate in valeric acid) was used. The mixed precursor contained 0.5 mol %, 2.5 mol %, 12.5 mol %, 50 mol %, and 75 mol % gadolinium in relation to the iron content. The formation of iron oxide phases, depending on the preparation conditions, was investigated. According to the results obtained, it was demonstrated that the presence of more than 2.5 mol % gadolinium additive in the mixed precursor inhibits the magnetite-to-hematite transformation process during thermal treatment. Produced samples were characterized by XRD and SEM methods, and the magnetic properties were studied.
对磁性纳米颗粒的兴趣主要源于其实际应用。在这项工作中，为了制备纯的和钆掺杂的氧化铁纳米晶粉末，采用了萃取 - 热解法（EPM）。作为前驱体，使用了含铁萃取物（己酸铁（III））或其与含钆萃取物（戊酸钆（III））的混合物。混合前驱体中钆相对于铁含量分别为0.5摩尔％、2.5摩尔％、12.5摩尔％、50摩尔％和75摩尔％。根据制备条件研究了氧化铁相的形成。根据所得结果表明，混合前驱体中钆添加剂含量超过2.5摩尔％会抑制热处理过程中磁铁矿向赤铁矿的转变过程。对制备的样品进行了XRD和SEM表征，并研究了其磁性能。
