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Related Concept Videos

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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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.
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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Related Experiment Video

Updated: Jul 6, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

The disordered cluster compound CaMo5(Mo0.38Ti0.62)O10.

P Gougeon1, P Gall

  • 1Sciences Chimiques de Rennes, UMR CNRS No. 6226, Université de Rennes I, Avenue du Général Leclerc, 35042 Rennes Cedex, France. patrick.gougeon@univ-rennes1.fr

Acta Crystallographica. Section C, Crystal Structure Communications
|March 7, 2008
PubMed
Summary
This summary is machine-generated.

Calcium pentamolybdenum titanium decaoxide, a novel compound, exhibits unique structural properties due to calcium

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Area of Science:

  • Solid-state chemistry
  • Inorganic materials science
  • Crystallography

Background:

  • The AMo(5)(Ti(0.7)Mo(0.3))O(10) (A = Sr, Eu) compounds provide a structural framework for studying related materials.
  • Understanding the influence of cation size on complex oxide structures is crucial for materials design.

Purpose of the Study:

  • To characterize the crystal structure and properties of calcium pentamolybdenum titanium decaoxide.
  • To investigate the impact of substituting strontium or europium with calcium in the AMo(5)(Ti(0.7)Mo(0.3))O(10) structure.

Main Methods:

  • Single-crystal X-ray diffraction analysis to determine the crystal structure.
  • Analysis of atomic coordination and site occupancies within the crystal lattice.

Main Results:

  • The title compound, calcium pentamolybdenum titanium decaoxide, is isomorphous with AMo(5)(Ti(0.7)Mo(0.3))O(10) (A = Sr, Eu).
  • Smaller calcium ions lead to increased molybdenum content at capping sites of Mo(10) clusters, forming Mo(11) and Mo(12) clusters.
  • The oxygen framework results from ABAC stacking of close-packed layers; Ca(2+) ions are 10-coordinated, and Ti(4+) is octahedrally coordinated.

Conclusions:

  • The substitution of larger A-site cations with smaller Ca(2+) significantly alters the molybdenum distribution within the bioctahedral clusters.
  • The observed structural modifications offer insights into the formation and stability of molybdenum-titanium oxide frameworks.