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A rapid one-step mechanosynthesis and characterization of nanocrystalline CaFe2O4 with orthorhombic structure
- 1.0357664 - ÚACH 2011 RIV NL eng J - Journal Article
Berchmans, L.J. - Myndyk, M. - da Silva, K.L. - Feldhoff, A. - Šubrt, Jan - Heitjans, P. - Becker, K.D. - Sepelak, V.
A rapid one-step mechanosynthesis and characterization of nanocrystalline CaFe2O4 with orthorhombic structure.
Journal of Alloys and Compounds. Roč. 500, č. 1 (2010), s. 68-73. ISSN 0925-8388. E-ISSN 1873-4669
Institutional research plan: CEZ:AV0Z40320502
Keywords : nanostructured materials * mechanochemical processing * microstructure * core-shell morphology * Mossbauer spectroscopy
Subject RIV: CA - Inorganic Chemistry
Impact factor: 2.138, year: 2010
CaFe2O4 nanopowders were prepared via single-step mechanochemical processing of two various mixtures of precursors: simple oxides (CaO and alpha-Fe2O3) and elemental metal and oxide powders (Ca and alpha-Fe2O3). The mechanically induced evolution of the CaO/alpha-Fe2O3 and Ca/alpha-Fe2O3 mixtures was followed by Fe-57 Mossbauer spectroscopy, XRD, and HR-TEM. The mechanosynthesis of CaFe2O4 proceeds very rapidly if starting from the metal/oxide system: after only 1 h of the mechanochemical treatment performed at room temperature, the synthesis of the complex oxide is almost completed. This is in a strong contrast to the conventional solid-state synthesis of CaFe2O4, which requires prolonged exposure (similar to 20 h) at considerably elevated temperatures (similar to 1400 K).
Permanent Link: http://hdl.handle.net/11104/0195878
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