Geoscience Reference
In-Depth Information
N
= 1:4
Pr
Na
2
R
6
[Ge
2
O
7
]
2
[Ge
4
O
12
]
Nd
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tu
Yb
Lu
Y
NaR[GeO
4
]
Na
4
R
2
[Ge
4
O
13
]
NaOH
20%
60%
90%
100%
Figure 7.45 NC diagram for sodium rare earth germinate system: T
5
650
C,
P
5
400
2500 atm
[44]
.
c
-Na
-Nd
NaNd
3
[GeO
4
](OH)
2
b
Na
2
Nd[GeO
4
](OH)
NaNd[GeO
4
]
C
Na
2
O
Figure 7.46 Change in rare earth motif during phase transition
[44]
.
concentration 5
6 mm size, commonly as
equidimensional crystals with pinacoidal and rhombohedral prisms belonging to the
olivine-type structure, are formed.
NaRGeO
4
crystallizes over a broad field and the GeO
2
/R
2
O
3
5
42 wt% and 100% output. Crystals of 4
2:1
1:1 in the
NaOH solutions of 5
80 wt% with 100% output. Crystals of 5 mm size have been
