Tellurite And Fluorotellurite Glasses For Active And Passive

5. Crystallisation studies; MDO 144
Intensity / Arbitary U nits
2000
0
d=4.26421
d=3.43390
d=3.32272
d=2.74678
d=2.64398
d=2.58970
d=2.51066
d=2.30330
d=2.25490
d=2.05985
d=1.76147
d=1.74507
d=1.72065
d=1.66611
10 20 30 40 50 60 70 80 90 100
2 Theta /°
ZnF2UT - File: ZnF2_UT.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
74-1816 (C) - Zinc Hydroxide Fluoride - ZnOHF - Y: 50.00 % - d x by: 1. - WL: 1.54056 - Orthorhombic - a 10.13000 - b 4.76000 - c 3.12000 - alpha 90.000 - beta 90.
07-0214 (I) - Zinc Fluoride - ZnF2 - Y: 50.00 % - d x by: 1. - WL: 1.54056 - Tetragonal - a 4.711 - b 4.71100 - c 3.132 - alpha 90.000 - beta 90.000 - gamma 90.000 -
Fig. (5.6): XRD trace of 99.995% ZnF2 powder, sourced from Alfa Aesar (⎯ JCPDS
card number 74-1816: Zn(OH)F, orthorhombic; ⎯ JCPDS card number 07-0214: ZnF2,
tetragonal, P42/mnm) [4].
Table (5.4): Ten most intense peaks with corresponding 2θ (observed and theoretical),
phases and Miller indices for 99.995% ZnF2 powder, sourced from Alfa Aesar.
Observed
2θθθθ / °
Observed
intensity / %
Theoretical
2θθθθ / °
Theoretical
intensity / %
Phase hkl
JCPDS
Card
20.82932 40.3 20.61490 100 Zn(OH)F 100 74-1816
25.94209 30.5 25.67798 10 Zn(OH)F 210 "
26.82540 51.6 26.76571 100 ZnF2 110 07-0214
32.58467 26.9 32.49605 34 Zn(OH)F 310 74-1816
34.61756 81.2 34.36759 95 ZnF2 101 07-0214
35.74092 48.3 35.50382 75 Zn(OH)F 111 74-1816
39.94393 47.7 39.39781 25 ZnF2 111 07-0214
52.28445 30.4 52.19120 80 ZnF2 211 "
53.07517 100.0 52.62954 8 Zn(OH)F 420 74-1816
61.69414 31.3 61.96837 14 ZnF2 310 07-0214
The presence of a hydroxide phase in the batch materials is problematic as it could lead to
a significant amount of OH in the final glass. This would result in absorption bands in the
d=1.59881
d=1.55339
d=1.49609
d=1.13079