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Related Concept Videos

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...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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,...
Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
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...

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Updated: May 12, 2026

Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals
08:54

Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals

Published on: May 25, 2016

Modelling zirconium hydrides using the special quasirandom structure approach.

H Wang1, A Chroneos, C Jiang

  • 1PSE Division, KAUST, Thuwal, 23955-6900, Saudi Arabia.

Physical Chemistry Chemical Physics : PCCP
|April 17, 2013
PubMed
Summary

Simulating zirconium hydride defects is complex. The special quasirandom structure method efficiently models random hydrogen distribution in zirconium alloys, crucial for nuclear reactor safety.

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Area of Science:

  • Materials Science
  • Nuclear Engineering
  • Computational Chemistry

Background:

  • Zirconium alloys are vital for nuclear reactor cladding.
  • Zirconium hydride formation causes embrittlement, impacting reactor safety.
  • Accurate simulation of hydrogen distribution is challenging.

Purpose of the Study:

  • To introduce a computationally efficient method for simulating random hydrogen distribution in zirconium hydrides.
  • To investigate the mechanical properties, stability, and electronic structure of ZrH(2-x) alloys.

Main Methods:

  • Generation of six special quasirandom structure (SQS) cells for ZrH(2-x) (x = 0.25-0.5).
  • Utilizing density functional theory (DFT) calculations.
  • Analysis of mechanical properties, stability, and electronic structure.

Main Results:

  • The SQS approach provides an effective model for random hydrogen distribution.
  • DFT calculations reveal key insights into the behavior of zirconium hydride alloys.
  • Characterization of mechanical properties, stability, and electronic structure.

Conclusions:

  • The SQS method is a viable and efficient approach for modeling defect processes in zirconium hydrides.
  • This research contributes to a better understanding of zirconium alloy embrittlement in nuclear reactors.
  • The findings support improved material design for enhanced nuclear reactor safety.