Tellurite And Fluorotellurite Glasses For Active And Passive

5. Crystallisation studies; MDO 145
infrared, which must be avoided to produce low loss infrared transmitting optical fibre.
Fig. (5.7) shows the XRD trace of the 99.995% ZnF2 sourced from Alfa Aesar, after it
had been treated by fluorination, as described in section 3.4 [4].
Lin (Counts)
10000
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
d=3.32888
d=2.60878
d=2.35218
d=2.28118
d=2.10452
d=1.74680
d=1.66356
d=1.56666
20 30 40 50 60 70 80 90 100
2-Theta - Scale
Fluorination 3 - File: ZnF2F3.RAW - Type: 2Th/Th locked - Start: 10.000 ° - End: 100.000 ° - Step: 0.020 ° - Step time: 1. s - Temp.: 25 °C (Room) - Time Started: 0 s - 2-Theta: 10.000 ° - Theta: 5.000 ° - Aux
Operations: Import
07-0214 (I) - Zinc Fluoride - ZnF2 - Y: 50.00 % - d x by: 1. - WL: 1.5406 - Tetragonal - a 4.711 - b 4.71100 - c 3.132 - alpha 90.000 - beta 90.000 - gamma 90.000 - Primitive - P42/mnm (136) - 2 - 69.5101 - F
Fig. (5.7): XRD trace of 99.995% ZnF2 powder, sourced from Alfa Aesar (⎯ JCPDS
card number: 07-0214, ZnF2, tetragonal, P42/mnm) [4].
It can be seen that this treatment was highly effective, producing a phase pure powder,
resulting in matches to JCPDS card number: 07-0214, ZnF2 tetragonal, space group
P42/mnm. Table (5.5) shows the ten most intense peaks with corresponding 2θ (observed
and theoretical) and Miller indices.
d=1.48769
d=1.41742
d=1.40269
d=1.30403
d=1.20473
d=1.17657
d=1.14064
d=1.10901
d=1.07894