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Título: | Microstructure characterization of multifunctional As4S4/Fe3O4 nanocomposites prepared by high-energy mechanical milling |
Autor: | Shpotyuk, O.; Bujnáková, Z.; Sayagués, María Jesús CSIC ORCID; Baláž, P.; Ingram, A.; Shpotyuk, Y.; Demchenko, P. | Palabras clave: | Electron microscopy Mechanical milling X-ray diffraction Nanocomposite Interface defects Positron annihilation Microstructure |
Fecha de publicación: | oct-2017 | Editor: | Elsevier | Citación: | Materials Characterization 132: 303-311 (2017) | Resumen: | Multifunctional AsS/FeO nanocomposites prepared by high-energy mechanical milling are probed by complementary methods of positron annihilation lifetime (PAL) spectroscopy, supported by microstructure characterization using X-ray powder diffraction (XRPD) with analysis applied to the first sharp diffraction peak (FSDP), morphology studies by transmission electron microscopy (TEM) with energy-dispersive spectroscopy (EDS) and high-resolution TEM (HRTEM). These nanocomposites are shown to consist of FeO crystallites with particle sizes of 8–21 nm, and far-separated β-AsS crystallites surrounded by amorphous As-S phase. In respect to PAL data, the effect of milling is identified as possible conversion from Ps traps to positron-trapping sites depending on preferential chemistry of atomic surrounding. So, the interfacial triple junctions at the intersections of FeO crystallites are identified as principal positron traps in AsS/FeO nanocomposites with competitive influence from free-volume defects of amorphous As-S phase. | Versión del editor: | https://doi.org/10.1016/j.matchar.2017.08.028 | URI: | http://hdl.handle.net/10261/191748 | DOI: | 10.1016/j.matchar.2017.08.028 | ISSN: | 1044-5803 |
Aparece en las colecciones: | (ICMS) Artículos |
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