Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Homo-epitaxy and twinning produce complex nanostructures in cryogenic calcite.

Journal of applied crystallography·2026
Same author

Image-based physical characterization of magnetotactic bacteria from an environmental sample.

Microbiology spectrum·2026
Same author

Ontogenesis of coelomocyte subsets and immune-related genes during Eisenia andrei embryogenesis.

Developmental and comparative immunology·2026
Same author

Nanoscale solid-fluid interaction and amphibole formation in the lithospheric mantle.

Scientific reports·2026
Same author

<i>Pseudogemmobacter sonorensis</i> sp. nov., a new alphaproteobacterium isolated from the slime flux of a tree (<i>Populus fremontii</i>) in the Sonoran Desert (Arizona, USA).

International journal of systematic and evolutionary microbiology·2025
Same author

Analysis of ICU resistome dynamics in patients, staff and environment for the identification of predictive biomarkers of sepsis and early mortality.

Scientific reports·2025
Same journal

Gradient-Based Experimental Design for Defect Detection in MoS2 Including Emission Potentials for Thermal Diffuse Scattering.

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·2026
Same journal

An Automated Atom Probe Tomography Cluster Detection Approach Using Transfer Learning.

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·2026
Same journal

Correlative Light and Electron Microscopy Visualization of Helicobacter pylori in Human Saliva.

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·2026
Same journal

Integrating Morpho-Anatomy and Histochemistry to Characterize Native Brazilian Eugenia Species.

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·2026
Same journal

Polyalthia Longifolia Induced Apoptosis via miR-484 Downregulation: A Multimodal In Situ Microscopy, In Vitro, and In Vivo Investigation.

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·2026
Same journal

Rhythmic Pattern of the Ovarian Development in Posthatching Japanese Quail (Coturnix coturnix japonica): Histological, Ultrastructural, and Immunohistochemical Study.

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·2026
See all related articles

Related Experiment Video

Updated: May 10, 2026

Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS
09:31

Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS

Published on: August 31, 2017

Complex defect in pyrite and its structure model derived from geometric phase analysis.

Péter Németh1, István Dódony, Mihály Pósfai

  • 1Research Center for Natural Sciences, Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences, H-1025 Budapest, Pusztaszeri út 59-67, Hungary.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|June 19, 2013
PubMed
Summary
This summary is machine-generated.

Geometric Phase Analysis (GPA) reveals a complex defect in pyrite, identified not as a simple dislocation but as a terminating marcasite slab. This method enhances defect interpretation in materials science.

More Related Videos

X-ray Powder Diffraction in Conservation Science: Towards Routine Crystal Structure Determination of Corrosion Products on Heritage Art Objects
09:16

X-ray Powder Diffraction in Conservation Science: Towards Routine Crystal Structure Determination of Corrosion Products on Heritage Art Objects

Published on: June 8, 2016

Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization
05:54

Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization

Published on: September 8, 2023

Related Experiment Videos

Last Updated: May 10, 2026

Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS
09:31

Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS

Published on: August 31, 2017

X-ray Powder Diffraction in Conservation Science: Towards Routine Crystal Structure Determination of Corrosion Products on Heritage Art Objects
09:16

X-ray Powder Diffraction in Conservation Science: Towards Routine Crystal Structure Determination of Corrosion Products on Heritage Art Objects

Published on: June 8, 2016

Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization
05:54

Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization

Published on: September 8, 2023

Area of Science:

  • Materials Science
  • Crystallography
  • Solid-State Physics

Background:

  • Transmission Electron Microscopy (TEM) is crucial for studying material defects.
  • Interpretive challenges can arise even in seemingly simple defect analyses using TEM.
  • Accurate defect characterization is vital for understanding material properties.

Purpose of the Study:

  • To re-evaluate a seemingly simple line defect in pyrite using advanced image processing.
  • To demonstrate the utility of Geometric Phase Analysis (GPA) in resolving complex defect structures.
  • To improve the accuracy of defect interpretation in High-Resolution TEM (HRTEM) imaging.

Main Methods:

  • Application of Geometric Phase Analysis (GPA) to HRTEM images of pyrite.
  • Analysis of atomic displacements to characterize defect symmetry.
  • Simulation of HRTEM images based on proposed defect models.

Main Results:

  • An apparent edge dislocation in pyrite was identified as a terminating {101} marcasite slab.
  • GPA revealed asymmetric atomic displacements inconsistent with a simple dislocation model.
  • Simulated HRTEM images validated the proposed marcasite slab model.

Conclusions:

  • GPA is powerful for avoiding misinterpretation of defects in HRTEM.
  • GPA can detect atomic-scale variations in elastic properties.
  • GPA facilitates the construction of accurate structural models for complex defects.