Lecture

EBSD Basics: Applications and Data Analysis

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In course

MSE-636: Organic semiconductors

Description

This lecture covers the basics of Electron Backscatter Diffraction (EBSD), including sample preparation, acquisition of EBSD patterns, Hough transform, and data analysis techniques. It explores the uses of EBSD for orientation measurements, phase identification, and quantitative microstructural data in various materials. The lecture also delves into the influence of accelerating voltage, spatial and angular accuracy, and applications of EBSD in crystallography. Practical aspects such as indexing of EBSPs, phase identification, and data analysis with orientation representations are discussed in detail.

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Instructor

Frank Nüesch

Teaching & PhD PhD Students Elodie Didier, Ceren Mitmit, João Pedro Ferreira Assunção, Vahid Charkhesht Past EPFL PhD Students Hui Zhang, Simon Johannes Dünki, Yee Song Ko, Lei Wang, Sandra Christina Jenatsch, Nicolas Alexandre Serge Leclaire, Donatas Gesevicius, Surendra Babu Anantharaman, Markus Regnat, Philip Horst Caspari, Patrik Schürch, David Reber, Karen Verena Strassel, Sina Abdolhosseinzadeh, Matthias Diethelm, Francis Owusu, Camilla Arietta Vael-Garn, Yeerlan Adeli, Wei-Hsu Hu, Cansu Zeytun Kara

Official source

Related concepts (23)

Electron backscatter diffraction

Electron backscatter diffraction (EBSD) is a scanning electron microscopy (SEM) technique used to study the crystallographic structure of materials. EBSD is carried out in a scanning electron microscope equipped with an EBSD detector comprising at least a phosphorescent screen, a compact lens and a low-light camera. In this configuration, the SEM incident beam hits the tilted sample. As backscattered electrons leave the sample, they interact with the crystal's periodic atomic lattice planes and diffract according to Bragg's law at various scattering angles before reaching the phosphor screen forming Kikuchi patterns (EBSPs).

X-ray crystallography

X-ray crystallography is the experimental science determining the atomic and molecular structure of a crystal, in which the crystalline structure causes a beam of incident X-rays to diffract into many specific directions. By measuring the angles and intensities of these diffracted beams, a crystallographer can produce a three-dimensional picture of the density of electrons within the crystal. From this electron density, the mean positions of the atoms in the crystal can be determined, as well as their chemical bonds, their crystallographic disorder, and various other information.

Crystallography

Crystallography is the experimental science of determining the arrangement of atoms in crystalline solids. Crystallography is a fundamental subject in the fields of materials science and solid-state physics (condensed matter physics). The word crystallography is derived from the Ancient Greek word κρύσταλλος (; "clear ice, rock-crystal"), with its meaning extending to all solids with some degree of transparency, and γράφειν (; "to write").

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.

Phase transition

In chemistry, thermodynamics, and other related fields, a phase transition (or phase change) is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic states of matter: solid, liquid, and gas, and in rare cases, plasma. A phase of a thermodynamic system and the states of matter have uniform physical properties. During a phase transition of a given medium, certain properties of the medium change as a result of the change of external conditions, such as temperature or pressure.

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