Geoscience Reference
In-Depth Information
(a)
(b)
(c)
A
RbNd P
4
O
12
RbNd (PO
3
)
-II
A
A
5
10
KND P
4
O
12
2
4
3
2
1
8
6
4
2
0
RbNd(PO
3
)
-I
CsNd(PO
3
)
4
K
ND (PO
3
)
4
Nd P
5
O
14
1
Nd P
5
O
14
Nd P
5
O
14
Nd (PO
3
)
3
Nd (PO
3
)
3
Nd (PO
3
)
3
B
B
B
0
2.6
3.2
3.8
3
4
5
6
1
2
P
2
O
5
/Cs
2
O + Nd
2
O
3
P
2
O
5
/K
2
O + Nd
2
O
3
P
2
O
5
/Rb
2
O + Nd
2
O
3
Figure 7.56 AB diagram of crystallization in (a) Cs
2
O
a
Nd
2
O
3
a
P
2
O
5
a
H
2
O, (b)
K
2
O
a
Nd
2
O
3
a
P
2
O
5
a
H
2
O, and (c) Rb
2
O
a
Nd
2
O
3
a
P
2
O
5
a
H
2
O systems
[253]
.
Figure 7.57 Phase
transformation with reference
to the changes in PT
conditions
[254]
.
700
500
300
0.5
1
2
P
H
2
O
(atm)
3
4
5
Figure 7.58 Phase
transformation with reference
to the changes in PT conditions
[254]
.
700
500
NdPO
4
NdP
5
O
14
NdP
3
O
9
0.5
1
2
3
4
5
P
H
2
O
(atm)
MNdP
4
O
12
!
NdP
3
O
9
!
NdPO
4
ð
7
:
16
Þ
NdP
5
O
14
!
NdP
3
O
9
!
NdPO
4
Using these results, Byrappa et al.
[253]
reported on the hydrothermal growth of
TmP
5
O
14
crystals under mild hydrothermal conditions. The crystal size was much
higher and crystals were well faceted than the crystals obtained by Yoshimura
et al.
[251]
. The important aspect of this work is the growth of ultraphosphates
under mild hydrothermal conditions (T
240
C, P
100 bar). The autoclaves
used were simple Morey type provided with Teflon liners. The crystallization was
carried out through spontaneous nucleation.
5
5,
