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Related Concept Videos

Determination of Crystal Structures01:29

Determination of Crystal Structures

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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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Crystal Growth: Principles of Crystallization01:25

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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...
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Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

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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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The Seven Crystal Systems: Overview01:24

The Seven Crystal Systems: Overview

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Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific...
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Crystal Field Theory - Octahedral Complexes02:58

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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...
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Construction of crystal structure prototype database: methods and applications.

Chuanxun Su1,2, Jian Lv1,3, Quan Li3

  • 1State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 2, 2017
PubMed
Summary
This summary is machine-generated.

A new method for assessing crystal structure similarity has been developed, leading to the creation of the Crystal Structure Prototype Database (CSPD). This database aids materials discovery by organizing and filtering crystallographic data.

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Area of Science:

  • Crystallography
  • Materials Science
  • Computational Chemistry

Background:

  • Crystal structure prototype data are crucial for materials discovery.
  • Existing methods for analyzing structural similarity can be inefficient.

Purpose of the Study:

  • To develop a robust and efficient method for assessing crystal structure similarity.
  • To construct a comprehensive Crystal Structure Prototype Database (CSPD).
  • To create tools for analyzing and filtering predicted crystal structures.

Main Methods:

  • Assessing structural similarity based on interatomic distances.
  • Utilizing hierarchical clustering theory for prototype definition.
  • Filtering known crystallographic structures to build the CSPD.
  • Developing the Structure Prototype Analysis Package (SPAP) for CALYPSO results.

Main Results:

  • A novel definition of crystal structure prototype was established.
  • The Crystal Structure Prototype Database (CSPD) was successfully constructed.
  • The Structure Prototype Analysis Package (SPAP) was developed to refine predicted structures.
  • Statistical analysis of prototype distribution offers insights for structure prediction.

Conclusions:

  • The CSPD is a valuable and generally applicable tool for materials discovery.
  • The developed methods enhance the efficiency of structure prediction and analysis.
  • The CSPD facilitates the generation of initial structures and prototype identification in databases.