Papers by Keyword: Mössbauer

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Authors: Stefano Enzo, G. Mulas, R. Frattini, G. Principi, Rajesh Gupta, R. Cooper, Neil Cowlam
Authors: P.P. Macrí, P. Rose, D.E. Banda, Neil Cowlam, G. Principi, Stefano Enzo
Authors: F. Saporiti, A.H. Kasama, B. Arcondo, Walter José Botta Filho, Claudio Shyinti Kiminami, Claudemiro Bolfarini, Fernando Audebert
Abstract: Fe-Si alloys have excellent soft magnetic properties, specially around 12 at% Si. However, its industrial application is limited because of the lack of ductility, which causes cracking during rolling operations for the fabrication of thin sheets. The reason of the brittleness of the high silicon alloys is a disorder/order reaction at low temperatures. The aim of this work is to analyze the effect of the addition of Aluminum on the crystalline structure of Fe-Si alloys. Samples with a chemical composition of Fe88Si12 and Fe87Si12Al1 (at%) were prepared by Spray Forming. The structure was studied by means of X-ray diffraction and Mössbauer Spectroscopy. The presence of the DO3 and α- Fe phases were observed
Authors: Peter Baláz, Zdenĕk Bastl, Tomãs Havlík, Jozef Lipka, Ignác Toth
Authors: A.-M. Van Bavel, G. Langouche
Authors: Leandro M. Socolovsky, Francisco H. Sánchez
Authors: K. Tokumitsu, Toshio Nasu, K. Suzuki, A. Lindsay Greer
Authors: Kelly Cristiane Gomes, Gabriel S.T. Lima, Sandro Marden Torres, Silvio Romero de Barros, Igor Frota Vasconcelos, Normando Perazzo Barbosa
Abstract: Geompolymers and their engineering applications have attracted significant attention of the scientific community. This is due to properties such as good thermal stability and high resistance to aggressive environments. Most studies on this subject are based on traditional precursor materials such as calcined kaolinite clay (metakaolinite) and fly ash. The iron content is significant, reaching around 10% in metakaolinite, for instance. The role of iron in geopolymers still lacks systematic investigation. This can be attributed to the limitations presenting nuclear magnetic resonance (NMR) spectroscopy, which is a widely used technique to study geopolymers structure. Ferromagnetic elements such as iron, which is often present in some precursors, affect the magnetic response of the material, compromising the proper analysis of its structure by NMR results. Iron content in some industrial residues may be several times higher as it is often found in metakaolinite. This work presents x-ray diffraction, infrared and Mössbauer spectroscopy studies on the distribution of iron species in iron oxide/hydroxide-rich precursor, which was used to synthesized geopolymers.
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