Publication

Electron diffraction and infrared study of the semimetallic layered compound Ti1−xVxSe2

1980
Journal Articles

Abstract

The crystals of the system Ti1−xVxSe2 (C ≤ x ≤ 0.05) undergo a second order structural phase transition. Electron diffraction studies show that the transition temperature decreases with progressive V-doping. The phase transition considerably affects the infrared reflectivity, measured at 300 and 77 K in the spectral range 40 cm−1 to 4000 cm−1. The presence of free carriers and the existence of optical infrared active Eu phonon modes Full-size image (

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https://infoscience.epfl.ch/entities/publication/f06100d4-b91a-45ff-b885-632c9f97cb41

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1980
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/f06100d4-b91a-45ff-b885-632c9f97cb41

About this result

Related concepts (32)

Electron diffraction

Electron diffraction refers to changes in the direction of electron beams due to interactions with atoms. Close to the atoms the changes are described as Fresnel diffraction; far away they are called Fraunhofer diffraction. The resulting map of the directions of the electrons far from the sample (Fraunhofer diffraction) is called a diffraction pattern, see for instance Figure 1. These patterns are similar to x-ray and neutron diffraction patterns, and are used to study the atomic structure of gases, liquids, surfaces and bulk solids.

Fermi level

The Fermi level of a solid-state body is the thermodynamic work required to add one electron to the body. It is a thermodynamic quantity usually denoted by μ or EF for brevity. The Fermi level does not include the work required to remove the electron from wherever it came from. A precise understanding of the Fermi level—how it relates to electronic band structure in determining electronic properties; how it relates to the voltage and flow of charge in an electronic circuit—is essential to an understanding of solid-state physics.

Infrared

Infrared (IR; sometimes called infrared light) is electromagnetic radiation (EMR) with wavelengths longer than those of visible light and shorter than radio waves. It is therefore invisible to the human eye. IR is generally understood to encompass wavelengths from around 1 millimeter (300 GHz) to the nominal red edge of the visible spectrum, around 700 nanometers (430 THz). IR is commonly divided between longer-wavelength thermal infrared that is emitted from terrestrial sources and shorter-wavelength near-infrared that is part of the solar spectrum.

Related publications (32)

Electron diffraction and infrared study of the semimetallic layered compound Ti1−xVxSe2

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