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Sodium Chloride Crystal Cleavage A knife is placed on a large sodium chloride crystal parallel to a cleavage plane. When the knife is tapped, the crystal breaks cleanly, creating two smaller crystals.
Crystals / Crystallography |
Ionic Bonding |
Solids
Piezoelectric Effect Sounds accompany the discharges of electricity.
A piezoelectric crystal is connected to a light bulb. When the crystal is pressed, the light flashes.
Crystals / Crystallography |
Molecular Properties / Structure |
Solid State Chemistry |
Solids
Thermochromism: Mercury(II) Iodide When red-orange Mercury(II) Iodide (HgI2) is heated, it undergoes a phase transition at 126oC to a pale yellow form. As the heated sample cools, it gradually returns to the original red-orange color.
Use of the Primitive Unit Cell in Understanding Subtle Features of the Cubic Close-Packed StructureJohn A. Hawkins, Linda M. Soper, Jeffrey L. Rittenhouse, and Robert C. Rittenhouse Examines the pedagogical advantages in presenting the primitive rhombohedral unit cell as a means of helping students to gain greater insight into the nature of the cubic close-packed structure. Hawkins, John A.; Soper, Linda M.; Rittenhouse, Jeffrey L.; Rittenhouse, Robert C. J. Chem. Educ.2008, 85, 90.
Crystals / Crystallography |
Metals |
Solids
Stuffed Derivatives of Close-Packed StructuresBodie E. Douglas Examines a variety of stuffed silica crystal structures in terms of the close-packing of one set of atoms or ions (P sites) with other atoms or ions in tetrahedral (T) or octahedral (O) sites and filled or partially filled layers in the regular pattern, PTOT. Douglas, Bodie E. J. Chem. Educ.2007, 84, 1846.
Crystals / Crystallography |
Group Theory / Symmetry |
Materials Science |
Metals |
Solid State Chemistry |
Solids
Filling in the Hexagonal Close-Packed Unit CellRobert C. Rittenhouse, Linda M. Soper, and Jeffrey L. Rittenhouse The illustrations of the hcp unit cell that are used in textbooks at all levels and also in crystallography and solid-state reference works are incomplete, in that they fail to include fractions of middle layer atomic spheres with centers lying outside of the unit cell. Rittenhouse, Robert C.; Soper, Linda M.; Rittenhouse, Jeffrey L. J. Chem. Educ.2006, 83, 175.
Gold LayersWilliam F. Coleman Four spheres surrounding a tetrahedral hole and six spheres surrounding an octahedral hole are highlighted and are partially transparent to show the holes.
Crystals / Crystallography |
Metals |
Solids |
Enrichment / Review Materials
Close Packing of Layers of SpheresWilliam F. Coleman An animation of the close packing of layers of spheres. In this version, clicking on text links adds the second and third layers, with two options for the third layer. After both ways of adding the third layer have been explored the user has an option to go to a second version that has no text but rather allows the user to drag the layers over one another.
Crystals / Crystallography |
Molecular Properties / Structure |
Solids |
Enrichment / Review Materials
Lattice EnergyWilliam F. Coleman PowerPoint presentation covering various aspects of the concept of lattice energy at the introductory and intermediate inorganic chemistry level. The presentation will open directly in the browser if your system has been so configured.
