Geoscience Reference
In-Depth Information
Figure 7.18 Arrhenius plot of
Na
5
YSi
4
O
12
single crystals
[79]
.
150
100
50
0
-50
°
C
10
2
Na
5
YSi
4
O
12
10
c
1
II
c
10
-1
10
-2
3
4
5
Inverse temperature (10
-3
K
-1
)
Figure 7.19 Photoluminescence spectra
in NaY[SiO
4
] crystals
[86]
.
1-
T
= 4.2 K
2-
T
= 290 K
3-
T
= 470 K
3
2
1
584
588
592
596
(nm)
