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Related Concept Videos

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...
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...
Crystal Density01:19

Crystal Density

The crystal lattice structure of a material allows us to determine how many molecules exist in its unit cell. With this information, alongside the unit-cell parameters - three distance parameters (a, b, c) and three angular parameters (α, β, γ).Density (ρ) = (Z × M) / (a × b × c × NA)where:Z is the number of formula units per unit cellM is the molar mass of the substancea, b, and c are the edge lengths of the unit cellNA is Avogadro’s numberFor a simple cubic lattice, atoms are located only at...
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Determination of Crystal Structures01:29

Determination of Crystal Structures

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...
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...

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Related Experiment Video

Updated: Jun 25, 2026

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

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CeAsSe-synthesis, crystal structure, and physical properties.

A Schlechte1, R Niewa, Yu Prots

  • 1Max-Planck-Institut fur Chemische Physik fester Stoffe, 01187 Dresden, Germany.

Inorganic Chemistry
|February 25, 2009
PubMed
Summary

Single crystals of cerium arsenoselenide (CeAsSe) were synthesized and structurally characterized, revealing a Zintl-type compound with unique arsenic chains and layered structure. Electrical resistivity measurements indicate semiconducting behavior.

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Last Updated: Jun 25, 2026

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

  • Solid State Chemistry
  • Materials Science
  • Crystallography

Background:

  • Cerium arsenoselenide (CeAsSe) is a ternary compound with potential applications in electronics.
  • Understanding its crystal structure and electronic properties is crucial for materials design.

Purpose of the Study:

  • To synthesize single crystals of CeAsSe.
  • To determine the crystal structure and chemical composition.
  • To investigate the electronic and magnetic properties.

Main Methods:

  • Single crystal X-ray diffraction
  • Synchrotron radiation diffraction
  • X-ray absorption spectroscopy
  • Magnetic susceptibility measurements
  • Electrical resistivity measurements

Main Results:

  • CeAsSe was synthesized using iodine as a mineralization agent.
  • The crystal structure was determined to be orthorhombic (space group Pnma), adopting the GdPS type.
  • The compound exhibits infinite cis-trans arsenic chains between Ce and Se layers.
  • Composition was found to be CeAs(1.01(1))Se(0.99(3)).
  • Orthorhombic distortion can vanish under certain conditions, leading to a tetragonal metric.
  • CeAsSe is an electronic precise Zintl-type compound (Ce(3+), As(1-), Se(2-)).
  • Semiconducting behavior was observed in electrical resistivity measurements.

Conclusions:

  • CeAsSe is a Zintl-type compound with a layered structure and infinite arsenic chains.
  • Its crystal structure can exhibit subtle distortions depending on synthesis conditions.
  • The compound demonstrates semiconducting properties, consistent with its Zintl character.