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Imperfections in Crystal Structure: Point, Line and Plane Defects

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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...

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Related Experiment Video

Updated: May 18, 2026

$On-Chip Crystallization and Large-Scale Serial Diffraction at Room Temperature$

On-Chip Crystallization and Large-Scale Serial Diffraction at Room Temperature

Published on: March 11, 2022

Crystalline-vitreous interface in two dimensional silica.

Leonid Lichtenstein¹, Markus Heyde, Hans-Joachim Freund

¹Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.

Physical Review Letters

|September 26, 2012

Summary

This summary is machine-generated.

Researchers studied the transition between crystalline and vitreous silica using low-temperature scanning tunneling microscopy. They observed that crystalline order gradually fades over 1.6 nm into the vitreous state.

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Area of Science:

Materials Science
Solid State Physics
Surface Science

Background:

Thin metal-supported silica films exhibit complex interfacial properties.
Understanding the crystalline-vitreous transition is crucial for materials design.

Purpose of the Study:

To investigate the structural evolution at the crystalline-vitreous interface in silica films.
To analyze changes in Si-Si distances, angles, and ring size distribution across the transition zone.

Main Methods:

Low-temperature scanning tunneling microscopy (LT-STM) was employed.
Local atomic distances and characteristic angles were measured.
Ring size distribution was analyzed near the transition.

Main Results:

The crystalline order was observed to decay gradually over approximately 1.6 nm.
Si-Si nearest neighbor distances and characteristic angles evolved across the interface.
Changes in ring size distribution were identified near the crystalline-vitreous transition.

Conclusions:

The crystalline-vitreous transition in silica films is a gradual process.
LT-STM provides high-resolution insights into interfacial structural dynamics.
The findings contribute to understanding amorphous material formation at interfaces.