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d
c
b
a
20
40
60
80
100
2
θ
(°)
d
c
b
a
55
60
65
70
75
80
2
θ
(°)
Figure 8.3 Powder X-ray diffraction patterns of (a) Ce
0.91
Na
0.09
O
1.87
, (b) e
0.87
Ca
0.13
O
1.86
F
0.03
,
(c) Ce
0.75
Ca
0.25
O
1.67
F
0.17
and (d) Ce
0.71
Ca
0.29
O
1.59
F
0.24
compositions. Reproduced with the
permission of ACS or American Chemical Society
