Geoscience Reference
In-Depth Information
Table 7.28 Experimental Conditions for the Growth of Li
2
B
4
O
7
Crystals
[362]
No. Nutrient
Composition
Temperatue
(
C)
Pressure
(bar)
%
Fill
Duration
(days)
Size
(mm)
Remarks
4
14 Bulk crystals of
tetragonal and
regular shapes
1.
LiBO
2
—
1.668
250
120
70
8
B
2
O
3
—2.332
HCOOH
(3 M)—
8ml
2.
LiBO
2
—
1.668
250
115
65
9
1
8
Polycrystalline and
wedge-shaped
crystals
B
2
O
3
—2.332
HCOOH
(2.5 M)—
8ml
3.
LiBO
2
—
1.668
250
100
60
8
3
10 Wedge-shaped
crystals
B
2
O
3
—2.332
HCOOH
(2 M)—
8ml
4.
LiBO
2
—
1.668
250
100
55
7
1
8 Wedge-shaped
crystals
B
2
O
3
—2.332
HCOOH
(1.5 M) —
6.5 ml
0.5
2 Well-developed
tetragonal crystals
5.
LiBO
2
—
1.668
250
90
50
8
B
2
O
3
—2.332
HCOOH
(1.5 M)—
6ml
6.
LiBO
2
—
1.668
250
120
70
8
4
14 Bulk crystals of
tetragonal and
regular shapes
B
2
O
3
—2.332
HCOOH
(3 M)—
8ml
for a period of 3 days without any fluctuations in the temperature. From the fourth
day onward, the temperature fluctuations to the tune of
20
C were introduced
periodically in order to reduce the nucleation centers. By this means, the earlier
developed small crystallites dissolve and only the bigger crystallites remain. This
provides the growth of bigger crystals (12
6
10 mm
3
). The big crystals do
12
3
3
