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Related Concept Videos

Metallic Solids02:37

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...
The Seven Crystal Systems: Overview01:24

The Seven Crystal Systems: Overview

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 requirements are not imposed on the...
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...
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
Structures of Solids02:22

Structures of Solids

Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...

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Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles
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Published on: October 16, 2017

Polymorphism in self-assembled AB6 binary nanocrystal superlattices.

Xingchen Ye1, Jun Chen, Christopher B Murray

  • 1Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

Journal of the American Chemical Society
|February 5, 2011
PubMed
Summary
This summary is machine-generated.

Researchers discovered a new body-centered cubic (bcc) structure in binary nanocrystal superlattices (BNSLs). This finding offers new ways to control material properties by tuning phase stability and interparticle interactions.

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

Area of Science:

  • Materials Science
  • Nanotechnology
  • Crystallography

Background:

  • Binary nanocrystal superlattices (BNSLs) are complex materials with emergent properties.
  • Understanding the structural diversity and phase behavior of BNSLs is crucial for their application.
  • Existing AB(6) polymorphs lack atomic analogues, presenting challenges in prediction and control.

Purpose of the Study:

  • To report the formation and structural characterization of a novel AB(6) polymorph in BNSLs.
  • To investigate the factors influencing the relative phase stability between different AB(6) polymorphs.
  • To explore the implications of structural findings on the growth mechanisms and potential applications of BNSLs.

Main Methods:

  • Systematic structural characterization of newly formed BNSLs.
  • Application of the space-filling principle to analyze and tailor phase stability.
  • Analysis of surface topology, twinning, and preferential orientation.

Main Results:

  • Discovery of a new AB(6) polymorph with body-centered cubic (bcc) symmetry in BNSLs.
  • Demonstration of tailoring phase stability from coexistence to phase-pure bcc-AB(6) using the space-filling principle.
  • Identification of entropic effects as a key driver for BNSL self-organization.
  • Observation of twinning and preferential orientation in the bcc-AB(6) phase, providing insights into growth mechanisms.

Conclusions:

  • The newly identified bcc-AB(6) phase, isomorphic to K(6)C(60), expands the known structural landscape of BNSLs.
  • Control over phase stability is achievable, driven by entropic effects, enabling tailored material properties.
  • The connection to Archimedean tilings suggests significant potential for structural diversity and metamaterial applications.