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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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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.
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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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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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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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Crystal structure of the solid solution (Sr1.65Pb0.35)Al6O11.

Matthias Weil1

  • 1Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, Vienna University of Technology, Getreidemarkt 9/164-SC, A-1060 Vienna, Austria.

Acta Crystallographica. Section E, Structure Reports Online
|October 14, 2014
PubMed
Summary

This study characterizes di(strontium/lead) hexa-aluminate, a solid solution with strontium and lead ions occupying distorted M sites within an aluminate framework. The crystal structure reveals complex polyhedral arrangements essential for understanding these materials.

Keywords:
aluminate frameworkcrystal structuresolid solution

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Crystallography

Background:

  • Di(strontium/lead) hexa-aluminate belongs to the (Sr2-x Pb x )Al6O11 solid solution series.
  • This compound features two statistically occupied M (2+) sites (M = Sr, Pb) within an aluminate framework.

Purpose of the Study:

  • To elucidate the crystal structure and cation distribution in di(strontium/lead) hexa-aluminate.
  • To analyze the coordination environments and distortions of strontium and lead ions.

Main Methods:

  • Single-crystal X-ray diffraction analysis.
  • Structural characterization of the (Sr2-x Pb x )Al6O11 solid solution series.

Main Results:

  • Identified two distinct M (2+) sites with specific Sr:Pb occupancy ratios (e.g., 0.756:0.244 and 0.897:0.103).
  • Observed distorted MOx polyhedra (coordination numbers 6 and 7) due to the M (2+) site locations.
  • Described the aluminate framework composed of edge-sharing AlO6 octahedra and corner-sharing AlO4 tetrahedra.

Conclusions:

  • The structure of di(strontium/lead) hexa-aluminate is characterized by statistically occupied M (2+) sites within a complex aluminate framework.
  • The distorted coordination polyhedra highlight the specific interactions between Sr/Pb cations and the aluminate structure.