1. Investigating the Lattice Structure of Monocrystales
JI Fei 季镄

2. Laue Condition
h,k,l are Laue indices

3. Laue Condition

4. Bragg Condition

5. A is the amplitude of scattered wave
Crystal Structure
A is the amplitude of scattered wave

6. Laue Diagram

7. (LEYBOLD Physics Leaflets P7.1.2.2)
Evaluation
Fig.9 Laue diagram at LiF
(LEYBOLD Physics Leaflets P )

8. Evaluation Xq/mm Yq/mm Zq*/mm h k l X*/mm Y*/mm 21.5 0.0 11.6 4 2 18.72
18.7
-20.0
10.4 -4
-18.7
-19.5
10.0 h k l
d/pm θ λ 3 1
92.4
13.3
42.5 6 2
60.7
17.5
36.5
63.7
18.4
40.2 4
67.1
19.5
44.8
82.2
24.1
90.1
26.6
80.7
Tab. 1: Co-ordinates and Miller indices of the reflections in the Laue diagram of LiF (*: calculated)
Tab. 2: Spacing of lattice planes d, Bragg angle an dwavelength associated with the sets of lattice LiF, a0= pm

9. Evaluation (h, k, l) a) b)

10. Evaluation (h, k, l) h, k, l λ 4, 0, 2 80.7 8, 0, 4 40.3 h k l d/pm 3
Tab. 2: Spacing of lattice planes d, Bragg angle and wavelength associated with the sets of lattice LiF, a0= pm h k l
d/pm 3 1
92.4
13.3
42.5 6 2
60.7
17.5
36.5
63.7
18.4
40.2 4
67.1
19.5
44.8
82.2
24.1
90.1
26.6
80.7
4, 0, 2
80.7
8, 0, 4
40.3