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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...
Chemical Formulas02:52

Chemical Formulas

A chemical formula presents information about the proportions of atoms constituting a particular chemical compound or molecule, mainly using symbols of elements and numbers. At times other symbols, such as dashes, parentheses, brackets, commas, plus, and minus signs, are also used. A chemical formula can be one of three types – molecular, empirical, and structural.
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,...
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...
Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...

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Spark Plasma Sintering Apparatus Used for the Formation of Strontium Titanate Bicrystals
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Ba(2)Ti(2)Si(2)O(9)F(2), a new titanium silicate.

Matthew Mann1, Joseph Kolis

  • 1Department of Chemistry, Clemson University, Clemson, SC 29634, USA.

Acta Crystallographica. Section C, Crystal Structure Communications
|April 7, 2009
PubMed
Summary

A new titanate, Dibarium dititanium difluoride dioxide heptaoxidodisilicate (Ba(2)Ti(2)Si(2)O(9)F(2)), features a unique layered framework. This structure combines titanium oxyfluoride octahedra and silicon tetrahedra, with barium atoms in channels.

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Published on: February 9, 2017

The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance
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Area of Science:

  • Materials Science
  • Crystallography
  • Inorganic Chemistry

Background:

  • Titanates are a class of inorganic compounds with diverse applications.
  • Understanding novel titanate structures is crucial for materials innovation.
  • The synthesis and characterization of new materials with unique frameworks are ongoing research areas.

Purpose of the Study:

  • To report the discovery and structural characterization of a new titanate compound.
  • To elucidate the unique crystal structure of Dibarium dititanium difluoride dioxide heptaoxidodisilicate.
  • To describe the atomic arrangement and bonding within the novel titanium silicate framework.

Main Methods:

  • Single-crystal X-ray diffraction was used to determine the crystal structure.
  • Analysis of atomic positions and coordination environments.
  • Description of the framework based on the refined structural data.

Main Results:

  • Dibarium dititanium difluoride dioxide heptaoxidodisilicate, Ba(2)Ti(2)Si(2)O(9)F(2), has been synthesized and structurally characterized.
  • The structure exhibits a unique edge-sharing titanate framework composed of titanium oxyfluoride octahedra and silicon tetrahedra.
  • A double stacked chain forms the base unit of the layered framework, with Ba atoms located in channels along the a axis.

Conclusions:

  • The discovery of Ba(2)Ti(2)Si(2)O(9)F(2) expands the family of known titanate materials.
  • The unique layered titanium silicate framework offers potential for new material properties and applications.
  • Further research into the properties and potential uses of this novel compound is warranted.