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Imperfections in Crystal Structure: Non-Stoichiometric Defects

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 Growth: Principles of Crystallization

Crystal Growth: Principles of Crystallization

Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent – the...

Imperfections in Crystal Structure: Stoichiometric Point Defects

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...

Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...

Imperfections in Crystal Structure: Point, Line and Plane Defects

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...

Molecular and Ionic Solids

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Related Experiment Video

Updated: May 8, 2026

Fabrication of Spatially Confined Complex Oxides

Fabrication of Spatially Confined Complex Oxides

Published on: July 1, 2013

Solid state pathways to complex shape evolution and tunable porosity during metallic crystal growth.

Carlos Díaz Valenzuela¹, Gabino A Carriedo, María L Valenzuela

¹Departamento de Química, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile.

Scientific Reports

|September 13, 2013

Summary

This summary is machine-generated.

Researchers developed methods to grow complex metallic crystals and porous metals, enabling control over shape and morphology for applications in chemistry and nanoscience. This solid-state approach allows for precise assembly and understanding of nanostructure evolution.

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Multi-Scale Modification of Metallic Implants With Pore Gradients, Polyelectrolytes and Their Indirect Monitoring In vivo

Multi-Scale Modification of Metallic Implants With Pore Gradients, Polyelectrolytes and Their Indirect Monitoring In vivo

Published on: July 1, 2013

Area of Science:

Materials Science
Nanotechnology
Solid-State Chemistry

Background:

Controlling the shape and morphology of metallic nanostructures is vital for advancements in chemistry, catalysis, biotechnology, and nanoscience.
Understanding the assembly and crystallization of nanostructures is key to defining their physical properties and enabling controlled surface deposition.

Purpose of the Study:

To achieve the growth of complex metallic crystals, high index facet nanocrystal composites, and tunable porosity metals in the solid-state.
To investigate the factors influencing the shape and morphology of these nanostructures.
To understand crystal evolution pathways for controlled deposition.

Main Methods:

Utilized a bottom-up growth strategy involving competitive coarsening of mobile nanoparticles.
Employed site-specific crystallization within a nucleation-dewetted matrix.
Investigated solid-state synthesis for gold (Au), silver (Ag), palladium (Pd), and rhenium (Re).

Main Results:

Successfully synthesized complex metallic crystals (nano- and microscale) and spinodal porous noble metals with controlled 3D inter-feature distances.
Demonstrated bottom-up growth and positioning of nanoparticles through controlled coarsening and crystallization.
Enabled in-situ imaging of shape evolution, density, and growth mechanisms.

Conclusions:

The developed solid-state methods allow for precise control over the formation of complex metallic nanostructures and porous metals.
Understanding nanoparticle behavior and crystallization dynamics is crucial for designing materials with tailored properties.
This work provides a pathway for engineering advanced nanomaterials for diverse scientific applications.