Article ID Journal Published Year Pages File Type
1589972 Micron 2009 6 Pages PDF
Abstract

Changes in the dielectric properties during the thermochromic transition of commercial VO2 powders were determined in situ, by analyzing the low-loss region of the electron energy-loss spectroscopy (EELS) spectra in a transmission electron microscope at room temperature (insulator phase) and 100 °C (metallic phase). A comparison of experimental EELS spectra and ab initio density-functional theory calculations (WIEN2k code) within the generalized gradient approximation (GGA) is presented. A characteristic peak around 5.6 eV appears in the energy-loss function in metallic phase, which is absent in insulator phase. The origin of the characteristic peak is analyzed by means of energy-band structure calculations.

Related Topics
Physical Sciences and Engineering Materials Science Materials Science (General)
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