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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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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...
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Determination of Crystal Structures01:29

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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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Unit Cells01:18

Unit Cells

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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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Structures of Solids02:22

Structures of Solids

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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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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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Related Experiment Video

Updated: Apr 17, 2026

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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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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Structure cristalline de type alluaudite K0.4Na3.6Co(MoO4)3.

Rawia Nasri1, Noura Fakhar Bourguiba1, Mohamed Faouzi Zid1

  • 1Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 El Manar Tunis, Tunisie.

Acta Crystallographica. Section E, Crystallographic Communications
|February 24, 2015
PubMed
Summary

A novel potassium sodium cobalt tris-molybdate, K0.4Na3.6Co(MoO4)3, was synthesized. This new material features an open 3D framework constructed from molybdate tetrahedra and cobalt/sodium dimers, creating cavities for alkali cations.

Keywords:
alluaudite-typecrystal structuretriple molybdate

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Area of Science:

  • Solid-state chemistry
  • Inorganic materials science
  • Crystallography

Background:

  • Molybdates are versatile inorganic compounds with diverse structures and applications.
  • Potassium and sodium cobalt molybdates are of interest due to their unique structural and electronic properties.

Purpose of the Study:

  • To synthesize and characterize a new triple molybdate compound, potassium sodium cobalt tris-(molybdate).
  • To elucidate the crystal structure and bonding of the synthesized material.
  • To compare the structure with related known molybdate compounds.

Main Methods:

  • Solid-state reaction synthesis method.
  • Single-crystal X-ray diffraction for structural determination.
  • Cation occupancy analysis and structural comparisons.

Main Results:

  • A new triple molybdate, K0.4Na3.6Co(MoO4)3, was successfully synthesized.
  • The crystal structure features M2O10 (M = Co/Na) dimers linked by MoO4 tetrahedra, forming an open 3D framework.
  • The structure is isotypic with Na3In2As3O12 and Na3In2P3O12, with specific cation distributions and coordination environments identified.

Conclusions:

  • The synthesis and structural analysis confirm the formation of a novel potassium sodium cobalt molybdate.
  • The intricate 3D framework structure provides insights into the packing of cations and polyhedra in complex molybdates.
  • The findings contribute to the understanding of structure-property relationships in ternary alkali metal transition metal molybdates.