Geoscience Reference
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(a)
D
hki
mm/day
0.2
1
2
3
0.1
1
3
CM
D
hki
mm/day
(b)
(c)
D
hki
mm/day
1
1
2
1'
4
4
1
2'
4
4
3
3
3
3
2
2
3'
4'
2
2
1
1
150
200
250
t
(
°
C)
5
25
50
Δ
t
(
°
C)
Figure 5.22 Solution concentration, growth temperature, and temperature gradient versus
growth rate (a
c)
[99]
.
crystallization charge and aluminophosphate charge. The temperature gradient has
been varied from 5
Cto50
C. When the
Δ
50
C), it introduces
T is high (40
macro inclusions and gas
liquid inclusions and are clearly visible upon passing
bright light through the crystal. The growth rates observed by the authors are rather
high at 0.35
0.50 mm/day in H
3
PO
4
, 0.35
0.45 mm/day in HCl, 0.25
0.35 mm/
day in HNO
3
, and 0.2
0.3 mm/day in H
2
SO
4
solvent media. The growth rate of
α
and [0001] seed plates against the solvent concentration,
growth temperature, and temperature gradient are shown in
Figure 5.22a
-berlinite on
½
1010
c
. The
growth rate from aluminophosphate glass is 1.5
2 times greater than that from a
fine crystalline charge under the same conditions for mild process parameters.
5.3.4 Morphology
Although AlPO
4
crystals obtained spontaneously are small in size, they exhibit distinct
morphological features. The crystal size varies from 0.5 to 4 mm and the common
