Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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,...

Lumber Defects

Lumber Defects

Lumber defects, which can affect both the appearance and structural integrity of wood, include a variety of growth and manufacturing flaws. Growth defects such as knots and knotholes occur where branches were once attached to the tree trunk, with knotholes forming when these knots fall out. Other natural defects include decay and insect damage, which compromise the wood's strength and durability.
Shakes are minor fractures that run along or across the wood's annual rings, while wane is...

Planar Rigid-Body Motion

Planar Rigid-Body Motion

Understanding the movement of a rigid body in planar motion involves recognizing that every particle within this body is traversing a path that maintains a consistent distance from a specific plane. This concept is fundamental in the study of physics and mechanical engineering, and it allows us to comprehend better how objects move in space.
Planar motion is typically divided into three distinct categories. The first is rectilinear translation, demonstrated by a subway train that moves along...

Gauss's Law: Planar Symmetry

Gauss's Law: Planar Symmetry

A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...

Structure of Benzene: Kekulé Model

Structure of Benzene: Kekulé Model

In 1865, August Kekule suggested the structure of benzene according to the structural theory of organic chemistry based on the three assertions—formula of benzene is C6H6, all the hydrogens of benzene are equivalent, and each carbon must have four bonds due to its tetravalency.
He proposed that benzene has a cyclic structure of six carbon atoms attached to one hydrogen atom each, with three alternating pi bonds.

Structure of Benzene: Molecular Orbital Model

Structure of Benzene: Molecular Orbital Model

According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).

You might also read

Related Articles

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

Sort by

Same author

Ultrasmooth Sub-Nanometer Chemical SiO<sub>2</sub> Surfaces and Enhanced Interface Characteristics via High-pH Fluoride Treatment for Si/HfO<sub>2</sub> MOS Devices.

ACS applied materials & interfaces·2026

Same author

Lattice strain relaxation in thin Mo films grown heteroepitaxially on MgO single crystals.

Journal of applied crystallography·2026

Same author

Replacing Doping in Nano-Silicon: Ultimate Miniaturization, Energy Efficiency, and Cryo-Functionality.

ACS applied materials & interfaces·2025

Same author

Evaluation of a Bio-Based Solvent Pretreatment for Sustainable Froth Flotation of Black Mass from Spent Lithium-Ion Batteries.

ACS sustainable resource management·2025

Same author

Adaptive response of the holdase chaperone network of Acidithiobacillus ferrooxidans ATCC 23270 to stresses and energy sources.

World journal of microbiology & biotechnology·2025

Same author

Impact of wettability onto the growth of air bubbles at micro-cavities on silicon wafers: Experiments, simulations, and analytical solutions.

Journal of colloid and interface science·2024

Search research articles

Related Experiment Video

Updated: Jan 29, 2026

A Pipeline to Characterize Structural Heart Defects in the Fetal Mouse

A Pipeline to Characterize Structural Heart Defects in the Fetal Mouse

Published on: December 16, 2022

Structure model of γ-Al₂O₃ based on planar defects.

Martin Rudolph¹, Mykhaylo Motylenko¹, David Rafaja¹

¹Institute of Materials Science, TU Bergakademie Freiberg, Gustav-Zeuner-Straße 5, D-09599 Freiberg, Germany.

|February 5, 2019

Summary

Defect structure in gamma-alumina (γ-Al2O3) was studied using electron diffraction and X-ray diffraction. Antiphase boundaries were identified as dominant defects, influencing crystallite size and planar defect density.

Keywords:

Debye equation anisotropic broadening antiphase boundaries microstructure defects powder X-ray diffraction rotational boundaries selected-area electron diffraction γ-alumina

More Related Videos

A Full Skin Defect Model to Evaluate Vascularization of Biomaterials In Vivo

A Full Skin Defect Model to Evaluate Vascularization of Biomaterials In Vivo

Published on: August 28, 2014

Development and Evaluation of a Rat Model of Full-Thickness Cartilage Defects

Development and Evaluation of a Rat Model of Full-Thickness Cartilage Defects

Published on: May 19, 2023

Related Experiment Videos

Last Updated: Jan 29, 2026

A Pipeline to Characterize Structural Heart Defects in the Fetal Mouse

A Pipeline to Characterize Structural Heart Defects in the Fetal Mouse

Published on: December 16, 2022

A Full Skin Defect Model to Evaluate Vascularization of Biomaterials In Vivo

A Full Skin Defect Model to Evaluate Vascularization of Biomaterials In Vivo

Published on: August 28, 2014

Development and Evaluation of a Rat Model of Full-Thickness Cartilage Defects

Development and Evaluation of a Rat Model of Full-Thickness Cartilage Defects

Published on: May 19, 2023

Area of Science:

Materials Science
Solid State Chemistry
Crystallography

Background:

Gamma-alumina (γ-Al2O3) is a crucial material in catalysis and adsorption.
Understanding its defect structure is key to optimizing its properties.
Boehmite is a common precursor for γ-Al2O3 synthesis.

Purpose of the Study:

To investigate the defect structure of γ-Al2O3 derived from boehmite.
To identify dominant crystallographic defects and their impact on material properties.
To correlate defect density with material stoichiometry.

Main Methods:

Selected-area electron diffraction (SAED) for defect identification.
Powder X-ray diffraction (XRD) for quantitative defect analysis.
Development of a GPU-accelerated routine for XRD pattern simulation.

Main Results:

SAED revealed antiphase boundaries as dominant defects in spinel-type γ-Al2O3.
XRD provided quantitative data on crystallite size and planar defect density.
A correlation between planar defects and structural vacancies was discussed.

Conclusions:

Antiphase boundaries significantly influence the defect structure of γ-Al2O3.
The study provides insights into the relationship between defects and stoichiometry.
Advanced simulation techniques aid in understanding complex defect structures.