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Thin Film Synthesis...
Thin Film Synthesis and Characterization of New MAX Phase Alloys
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- Mockutė, Aurelija (författare)
- Linköpings universitet,Tunnfilmsfysik,Tekniska högskolan
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- Rosén, Johanna, Dr. (preses)
- Linköpings universitet,Tunnfilmsfysik,Tekniska högskolan
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- Hultman, Lars, Professor (preses)
- Linköpings universitet,Tunnfilmsfysik,Tekniska högskolan
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- Radnóczi, György (opponent)
- MFA, Hungarian Acad. Sci.
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(creator_code:org_t)
- ISBN 9789175198682
- Linköping : Linköping University Electronic Press, 2012
- Engelska 37 s.
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Serie: Linköping Studies in Science and Technology. Thesis, 0280-7971 ; 1538
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Abstract
Ämnesord
Stäng
- The objective of this Thesis is synthesis and characterization of new MAX phase alloys (M = early transition metal, A = A-group element, and X = C or N) based on incorporation of M and X elements previously not used in any known MAX phases. This is motivated by a search for optimized and unique materials properties, such as different magnetic states.Two synthesis routes have been used to attain Ti2AlC1-xOx: deposition of Ti2AlCy under high vacuum conditions with residual gas acting as O source, and solid-state reactions following deposition of understoichiometric TiCy on Al2O3. Detailed local quantification by analytical transmission electron microscopy (TEM) including electron energy loss spectroscopy (EELS) shows up to 13 at.% O within high quality MAX phase structure. According to previous theoretical work, the range of experimentally obtained O content is enough to observe drastic changes in the materials anisotropic electronic properties. Calculations on effect of substitutional O on shear deformation have also been performed.In a recent theoretical study by Dahlqvist et al., (Cr,Mn)2AlC has been predicted as a new stable magnetic nanoscale laminate. Inspired by this work, thin films of (Cr,Mn)2AlC, as well as of a neighboring system (Cr,Mn)2GeC, have been synthesized by magnetron sputtering. Incorporation of 8 and 12.5 at.% of Mn, respectively, has been detected by analytical TEM including EELS and energy dispersive X-ray spectroscopy (EDX). The total saturation moment of 0.36μB per Mn atom at 50 K has been measured by vibrating sample magnetometry (VSM) for a (Cr,Mn)2GeC sample, providing the first experimental evidence of a magnetic MAX phase.The experimental results obtained in this Thesis provide a base for expanding the MAX phase definition and materials characteristics into new areas, towards further fundamental understanding and functionalization.
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