Synthesis of AlFe Intermetallic Nanoparticles by High-Energy Ball Milling
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Synthesis of AlFe Intermetallic Nanoparticles by High-Energy Ball Milling G. Rosas1*, J. Chihuaque1, E. Bedolla1, R. Esparza2 and R. Pérez2 1
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Instituto de Investigaciones Metalúrgicas, UMSNH, Edificio U, Ciudad Universitaria, Morelia, Mich., 58000, México. *Email: [email protected]
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Santiago de Querétaro, Qro., 76230, México.
ABSTRACT In this investigation, the chemical and microstructural characteristics of nanostructured AlFe intermetallic produced by high-energy ball milling have been explored. High purity elemental powders were used as the starting material. The ball milling was carried out at room temperature using a SPEX-8000 mixer/mill. The structure, morphology and compositions of the powders were obtained using X-ray diffraction patterns (XRD), scanning and transmission electron microscopy (STEM). High resolution electron microscopy observations have been used in the nanostructured materials characterization. The structural configurations have been explored through comparisons between experimental HREM images and theoretically simulated images obtained with the multislice method of the dynamical theory of electron diffraction.
INTRODUCTION Nanoscale materials have stimulated great interest due to their importance in basic scientific research and potential technological applications, which exhibit unique chemical and physical properties, differing substantially from the bulk counterpart [1-2]. The synthesis of nanostructured materials is one of the main research topics in the nanoscience scientific and technological community [3]. Since the discovery of the carbon, nanotubes by Iijima [4] different methods have been explored to produce nanomaterials [5, 6]. Thus, for example, chemical methods have been commonly used for the synthesis of nanoparticles, nanotubes and nanorods [7, 8]. However, other procedures have also been successful used [9]. Mechanosynthesis has been recently used as a procedure to synthesized nanostructures [10]. Mechanosynthesis processes are known as: mechanical milling, mechanical alloying and reactive milling. Mechanical milling is referring to the milling of a pure metal or compound. Mechanical alloying is referring to the formation of alloys from elemental precursors during the process. Reactive milling uses mechanical processing to induce chemical reactions [11]. Also, mechanosynthesis has been considered as a route of green Chemistry processes [12]. In recent years, the mechanochemical processes have been used for the synthesis of different metallic nanoparticles, nanorods and nanotubes [13, 14]. The magnetic properties of nanostructured iron materials have drawn special attention due to potential applications in sensors and storage
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devices. Also, iron has been found to be one of the main catalytic elements for the growth of nanotubes [15]. In order to know the mechanism of formation of these structures it is important to study their mechanism of growth s
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