Geoscience Reference
In-Depth Information
Sulfate and water combine. However, the first crystal count was almost
twice the second count. Beyond the temperature of the second peak toward
0
◦
C, the count gradually goes down.
The modal dimension of crystal count has two distinct peaks coincident
with the two peak temperatures in the crystal count. But, the two peaks
in the modal value attain almost the same height. There is a distinct third
peak in the modal value around
8
◦
C; the reason of its existence is not at
−
all clear.
4.5
. Variation of crystal habit with seeding temperature
in case of DMSO coated with Ammonium Sulfate
The variation of crystal habit with temperature is presented in Table 2. The
variation of basic habit with temperature is consistent to a large extent with
Table 1, except for the shift in percentage and size. In this case, dendrite
formations have much smaller size and the rod-shaped formations exist over
a wider range of temperatures.
4.6
. Optical parameters when DMSO is seeded
In clear conditions the intensity of direct beam is always 13.4 J/m only.
However, after the introduction of steam, the same intensity drops to a
value about 6 J/m only. In case of seeding, the scattered beams are produced
at the expense of direct intensity. The forward-scattered intensities at 30
◦
Table 2.
Crystal habits when DMSO-coated Ammonium Sulfate is seeded.
Temperature
Crystal habit
−
22
◦
Cto
−
17
◦
C Dendrite formations are highest. Rod and rectangular shapes are
also significant. [Dendrite (43%): 12.5-17.5
µ
m; Rod (32%):
12.5-17.5
µ
m; Rectangular (25%): 10-15
µ
m]
−
17
◦
Cto
−
8
◦
C Rectangular formations are dominant. Rod, dendrite, hexagonal,
and cubic forms are also present. [Rectangular (61%): 5-7
µ
m;
Rod (19%): 15-50
m; Dendrite (10%): 8-12
m; Hexagonal
µ
µ
(6%): 5-12
m; Cubic (4%): 7-15
m]
µ
µ
8
◦
Cto0
◦
C
−
Rod shapes are dominant. Cubic, rectangular, and hexagonal
are other formations. [Rod (53%): 5-12
m; Cubic (19%):
7-10
µ
m; Rectangular (18%): 5-12
µ
m; Hexagonal (10%):
10-20
µ
m]
µ
