Synthesis, characterization and study of physical properties of novel M(n+1)AX(n) compounds
Abstract
Mn+1 AXn compounds, the ternary layered nanolaminates have gathered momentum in the last decade since its advent because of their unusual but exciting properties. These technologically important compounds combine some of the best properties of metals and ceramics. Like ceramics they are refractory, oxidation resistant, elastically stiff and relatively light. They also exhibit metallic properties like excellent machinability, thermal and electrical conductivity. This dissertation concentrates on the synthesis of germanium-based 211 Mn+1 AXn compounds. The main objective of the research was to synthesize predominantly single phase samples of Cr2 GeC, V2 GeC and Ti2 GeC. Another goal was to study the effect of solid substitutions on the M-site of Mn+1 AXn compounds with Ge as an A-element. This study is in itself the first to demonstrate the synthesis of (Cr0.5 V0.5 )2 GeC a novel Mn+1 AXn compound. Scanning electron microscopy coupled with energy dispersive spectroscopy, x-ray diffraction and electron probe microanalysis were employed to confirm the presence of predominantly single phase samples of M2 GeC compounds where M = Ti, V, Cr and (Cr 0.5 V0.5 ). A large part of the dissertation also focuses on the effect of the compressibility on the Ge-based 211 Mn+1 AXn compounds with the aid of diamond anvil cell and high energy synchrotron radiation. This study also concentrates on the stability of these compounds at high temperature and thereby determines its suitability as high temperature structural materials. In order to better understand the effect of substitutions on A-site of 211 Mn+1 AXn compounds under high pressure and high temperature, a comparison is made with previously reported 211 Mn+1 AXn compounds with Al, Ga and S as A-site elements.
Recommended Citation
Nishad Arvind Phatak,
"Synthesis, characterization and study of physical properties of novel M(n+1)AX(n) compounds"
(January 1, 2008).
ETD Collection for Florida International University.
Paper AAI3351571.
http://digitalcommons.fiu.edu/dissertations/AAI3351571
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