The beta Tridymite
(SiO2) Structure
Last modified 5 April
2001
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- Prototype: beta Tridymite (SiO2)
- Pearson Symbol: hP12
- Strukturbericht Designation: C10
- Space Group: P63/mmc (Cartesian and lattice coordinate listings
available)
- Number: 194
- Primitive Vectors:
- A1 = ½ a X - ½ 31/2
a Y
- A2 = ½ a X + ½ 31/2
a Y
- A3 = c Z
- Basis Vectors:
Atoms O-I are on the (2c) sites, atoms O-II are on the (6g)
sites, and the Si atoms are on the (4f) sites. Experimentally
z = 0.0620.
- B1 = 1/3 A1 + 2/3
A2 + ¼ A3 = ½ a
X + ½ 3-1/2 a Y + ¼ c Z
(O-I)
- B2 = 2/3 A1 + 1/3
A2 + ¾ A3 = ½ a
X - ½ 3-1/2 a Y + ¾ c Z
(O-I)
- B3 = 1/3 A1 + 2/3
A2 + z A3 = ½ a
X + ½ 3-1/2 a Y + z c Z
(Si)
- B4 = 2/3 A1 + 1/3
A2 - z A3 = ½ a
X - ½ 3-1/2 a Y - z c Z
(Si)
- B5 = 2/3 A1 + 1/3
A2 + (½ + z) A3 = ½ a
X - ½ 3-1/2 a Y + (½ + z) c
Z (Si)
- B6 = 1/3 A1 + 2/3
A2 + (½ - z) A3 = ½ a
X + ½ 3-1/2 a Y + (½ - z) c
Z (Si)
- B7 = ½ A1 = ¼ a
X - ¼ 31/2 a Y (O-II)
- B8 = ½ A2 = ¼ a
X + ¼ 31/2 a Y (O-II)
- B9 = ½ A1 + ½
A2 = ½ a X (O-II)
- B10 = ½ A1 + ½
A3 = ¼ a X - ¼ 31/2 a
Y + ½ c Z (O-II)
- B11 = ½ A2 + ½
A3= ¼ a X + ¼ 31/2 a
Y + ½ c Z (O-II)
- B12 = ½ A1 + ½
A2 + ½ A3= ½ a X
+ ½ c Z (O-II)
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