The simplified structure factor for (111) reflection is:
(a) f Ca
(b) 2f Ca
(c) 4f Ca
(d) 6f Ca
40. CaF 2 (Fluorite) is a face-centered cubic with 4 CaF 2 molecules per unit cell.
The Ca and F ions are located at the following positions:
Ca : 0; 0; 0
ð
Þ; 1=2; 1=2; 0
ð
Þ ; 0; 1=2; 1=2
ð
Þ ; 1=2; 0:1=2
ð
Þ ;
F : 1=4; 1=4; 1=4
ð
Þ ; 1=4; 1=4; 3=4
ð
Þ ; 1=4; 3=4; 1=4
ð
Þ ; 3=4; 1=4; 1=4
ð
Þ ;
3=4; 3=4; 1=4
ð
Þ ; 3=4; 1=4; 3=4
ð
Þ ; 1=4; 3=4; 3=4
ð
Þ ; 3=4; 3=4; 3=4
ð
Þ
The intensity corresponding to (111) reflection is:
(a) 4f Ca
2
(b) 8f Ca
2
(c) 12f Ca
2
(d) 16f Ca
2
41. CaF 2 (Fluorite) is a face-centered cubic with 4 CaF 2 molecules per unit cell.
The Ca and F ions are located at the following positions:
Ca : 0; 0; 0
ð
Þ; 1=2; 1=2; 0
ð
Þ ; 0; 1=2; 1=2
ð
Þ ; 1=2; 0: 1=2
ð
Þ ;
F : 1=4; 1=4; 1=4
ð
Þ ; 1=4; 1=4; 3=4
ð
Þ ; 1=4; 3=4; 1=4
ð
Þ ; 3=4; 1=4; 1=4
ð
Þ ;
3=4; 3=4; 1=4
ð
Þ ; 3=4; 1=4; 3=4
ð
Þ ; 1=4; 3=4; 3=4
ð
Þ ; 3=4; 3=4; 3=4
ð
Þ
The simplified structure factor for (222) reflection is:
(a) 4f Ca - 8f F
(b) 4f Ca - 4f F
(c) 8f Ca - 8f F
(d) 8f Ca - 4f F
42. CaF 2 (Fluorite) is a face-centered cubic with 4 CaF 2 molecules per unit cell.
The Ca and F ions are located at the following positions:
Ca : 0; 0; 0
ð
Þ; 1=2; 1=2; 0
ð
Þ ; 0; 1=2; 1=2
ð
Þ ; 1=2; 0:1=2
ð
Þ ;
F : 1=4; 1=4; 1=4
ð
Þ ; 1=4; 1=4; 3=4
ð
Þ ; 1=4; 3=4; 1=4
ð
Þ ; 3=4; 1=4; 1=4
ð
Þ ;
3=4; 3=4; 1=4
ð
Þ ; 3=4; 1=4; 3=4
ð
Þ ; 1=4; 3=4; 3=4
ð
Þ ; 3=4; 3=4; 3=4
ð
Þ
The intensity corresponding to (222) reflection is:
(a) 8(f Ca - 2f F )
2
(b) 16(f Ca - 2f F )
2
(c) 24(f Ca - 2f F )
2
(d) 32(f Ca - 2f F )
2
8.2 Determination of Phase Angle, Amplitude …
335