Crystallography Flashcards
(24 cards)
rotational axis symetry
How many times does the structure repeat itself as you spin around the C axis, most commonly comes as 2,3,4, and 6
How many times does the structure repeat itself as you spin around the C axis, most commonly comes as 2,3,4, and 6
Rotational symetry
mirror plane
if you cut the structure along this it will be mirrored on both sides
if you cut the structure along this it will be mirrored on both sides
mirror plane
Inversion Symmetry
when the shape is identical around a plane that passes through multiple axis, frequently accompanied by other types of symmetries.
when the shape is identical around a plane that passes through multiple axis, frequently accompanied by other types of symmetries.
Iversion symmetry
Crystal systems
describing the crystals based on their symmetry.
describing the crystals based on their symmetry.
crystal systems
C axis
the axis with the maximum amount of symetry, usually represented as up/down
the axis with the maximum amount of symetry, usually represented as up/down
C axis
A axis
comes out of the front of the diagram, usualy the shortest
comes out of the front of the diagram, usualy the shortest
A axis
a=b=c, perpendicular
Tetragonal system
tetragonal system
a=b=c, perpendicular
A=b, C is long, perpendicular
Isometric system
Isometric system
A=b, C is long, perpendicular
A, B, and C are all diferent, but still paralel
Orthorhombic
Orthorhombic
A, B, and C are all diferent, but still paralel
A=b=c, but one axis is not perpendicular
Monoclinic
Monoclinic
one axis is not perpendicular
triclinic
two axis are not perpendicular
two axis are not perpendicular
Triclinic.
miller index
a method of defining a crystal face on (a,b,c) axis depending on what axis it intercects. 0 means no, 1 means yes, and -1 means it intersects the negative axis.
a method of defining a crystal face on (a,b,c) axis depending on what axis it intercects. 0 means no, 1 means yes, and -1 means it intersects the negative axis.
miller index
