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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...
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...
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,...
Unit Cells01:18

Unit Cells

A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
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...

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Updated: Jul 13, 2026

Electrospray Deposition of Uniform Thickness Ge23Sb7S70 and As40S60 Chalcogenide Glass Films
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A Dodecagonal Quasicrystalline Chalcogenide.

Matthias Conrad1, Frank Krumeich2, Bernd Harbrecht1

  • 1Fachbereich Chemie und Wissenschaftliches Zentrum für Materialwissenschaften der Universität, Hans-Meerwein-Strasse, D-35043 Marburg (Germany), Fax: (+49) 6421-28-8917.

Angewandte Chemie (International Ed. in English)
|May 2, 2018
PubMed
Summary

Researchers discovered the first stable quasicrystalline chalcogenide, Ta1.6Te, exhibiting twelvefold rotational symmetry. This tantalum-rich telluride opens new avenues for studying unusual ordering states in materials science.

Keywords:
ChalcogensHigh-temperature chemistryQuasicrystalsSolid-state chemistryTantalumTellurium

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Crystallography

Background:

  • Quasicrystals represent a unique state of matter with non-periodic atomic ordering.
  • Chalcogenide materials offer diverse electronic and structural properties.
  • Previous research has explored various quasicrystalline structures, but dodecagonal phases in chalcogenides remained elusive.

Purpose of the Study:

  • To synthesize and characterize the first stable dodecagonal quasicrystalline chalcogenide.
  • To investigate the structural properties and ordering of this novel material.
  • To establish a foundation for further research into dodecagonal quasicrystals.

Main Methods:

  • Preparative scale synthesis of tantalum-rich telluride (Ta1.6Te).
  • Reduction of tantalum ditelluride (TaTe2) with tantalum below 1870 K.
  • Analysis of diffractograms to confirm twelvefold rotational symmetry.

Main Results:

  • Successful preparation of a tantalum-rich telluride, Ta1.6Te.
  • Observation of diffractograms displaying twelvefold rotational symmetry.
  • Identification of Ta1.6Te as the first stable dodecagonal quasicrystalline phase in chalcogenides.

Conclusions:

  • The discovery of Ta1.6Te provides the first stable example of a dodecagonal quasicrystalline chalcogenide.
  • This material enables detailed studies of unusual ordering phenomena in quasicrystals.
  • The findings open new research directions in materials science and condensed matter physics.