Knowlwdge of crystal structure is important for discussing or understanding properties of materials. Mechanical properties are related to behavior of atoms, dislocations, twins, boundaries and etc. Electronic structure, which is used to explain the electronic properties, optical properties and etc., cannot be obtained without the knowledge of crystal structure.
Some of crystal structures are drawn. Select the above and Click, if you want to see the crystal structures.
Figures are drawn with using program, ATOMS.
Strukturbericht symbol, such as
A2, B2, ... etc, is sometimes used for identifying a crystal structure. Elements is symbolized to be A**, and XY type compound is
symbolized B**, XY2 type compound is C**, XmYn type
is D** and a compound having more than three elements is E**. Some examples are listed
The Pearson symbol represents crystal system, type of Bravais lattice and number of atoms in the unit cell. For example, fcc (face centered cubic) structure is cubic system with face centered Bravais lattice involving 4 atoms in the init cell. So Pearson symbol of fcc structure is cF4. The crystal system is abbriviated to be a=triclinic, m=monoclinic, o=orthorhombic, t=tetragonal, h=hexagonal and trigonal and c=cubic. The Bravais lattice is represented to be P, S (for A, B and C), R, F and I.
|Crystal structure||Strukturbericht symbol||Pearson symbol|
|White Tin (Sn)||A5||tI4|
|CsCl||B2||cP2||L20 is found in some textbook, but does not appeare in Pearson's Handbook.|
|SiO2 (high quartz)||C8||hP9|
|SiO2 (b cristobalite)||C9||cF24|
|AlB2||C32||hP3||Omega phase has this type of structure.|
|Co3S4(Linnaeite)||D72||cF56||Prototype of Magnetite (Fe3O4)|
|Cr23C6||D84||cF116||Carbide found in steels. Secondary carbide is reported to have this structure.|
|Mn7C3||D101||oP40||Carbide found in steels. Primary carbide is reported to have this structure.|
|Perovskite (cubic BaTiO3)||E21||cP5|
|AuCu, FePt||L10||tP4||If the unit cell is taken different way, Peason symbol becomes tP2.|
note: b-W (WO3) type structure is symbolized A15, in spite of two elements included, because of historical reason.
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