A rapid one-step mechanosynthesis and characterization of nanocrystalline CaFe2O4 with orthorhombic structure

0357664 - ÚACH 2011 RIV NL eng J - Článek v odborném periodiku
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
Výzkumný záměr: CEZ:AV0Z40320502
Klíčová slova: nanostructured materials * mechanochemical processing * microstructure * core-shell morphology * Mossbauer spectroscopy
Kód oboru RIV: CA - Anorganická chemie
Impakt faktor: 2.138, rok: 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).
Trvalý link: http://hdl.handle.net/11104/0195878