Tetragonal (4/m) Space Groups
Steven Dutch, Natural and Applied Sciences,
To the right of each space group is a listing of coordinate points. These are the coordinates to which a general point (x,y,z) is transformed by the space group. Origins (called "equivalent points" in the International Tables), are additional points around which the points are transformed. For example, (0,0,0) refers to a corner of the unit cell, (1/2,1/2,1/2) to the center. All space groups have origin (0,0,0). For a space group with an additional origin (1/2,1/2,1/2), point (x,y,z) is also transformed to (1/2+x,1/2+y,1/2+z) and so on.
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83
P4/m (+x,+y,+z);
(-x,-y,+z); (+y,-x,+z); (-y,+x,+z)
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84
P42/m (+x,+y,+z);
(-x,-y,+z); (+y,-x, 1/2+z); (-y,+x, 1/2+z)
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85
P4/n (+x,+y,+z);
(-x,-y,+z); (+y,-x,-z); ( -y,+x,-z)
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86
P42/n (+x,+y,+z);
(-x,-y,+z); (+y,-x,-z); (-y,+x,-z)
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87
I4/m
+x,+y,+z);
(-x,-y,+z); (+y,-x,+z); (-y,+x,+z)
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88
I41/a
(+x,+y,+z);
(-x,-y,+z); (+y,1/2-x,1/4+z); ( -y,1/2+x,1/4+z)
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