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Nuclear Science Journal of Malaysia, Vol. 18, No. 2, Dec 2000 38
Table 2: Peak positions (2) in the XRD patterns of Ni/Co(II)-doped SnO 2
(0.1:29.97:69.93)
Temperature (C) 2 () d/Å d/Å(PDF) Assignment
27.06
33.40
3.29
2.68
3.35
2.64, 2.62
SnO 2 (t)
SnO 2 (t), CoO(c)
400
37.01 2.43 2.44
Co 3 O 4 (c)
38.44 2.34 2.37
SnO 2 (t)
51.27
64.31
1.78
1.45
1.76
1.43, 1.42
SnO 2 (t)
Co 3 O 4 (c), SnO 2 (t)
600
800
1000
t: tetragonal, c: cubic
26.78
31.51
33.96
34.32
36.93
38.25
52.01
58.49
65.50
26.77
31.40
34.01
36.89
38.04
39.14
44.93
51.94
54.93
59.32
62.13
65.05
66.09
17.87
26.72
29.31
34.04
34.51
36.09
38.04
41.91
51.95
55.24
60.63
64.87
66.03
3.33
2.84
2.64
2.61
2.43
2.35
1.76
1.58
1.42
3.33
2.85
2.63
2.43
2.36
2.30
2.02
1.76
1.67
1.56
1.49
1.43
1.41
4.96
3.33
3.05
2.63
2.60
2.49
2.36
2.15
1.76
1.66
1.53
1.44
1.41
3.35
2.86
2.64
2.62
2.44
2.37
1.76
1.61
1.43, 1.42
3.35
2.86
2.64, 2.62, 2.61
2.44
2.37
2.31
2.02
1.76
1.68
1.56
1.50
1.43
1.42
4.99
3.35
3.06
2.64
2.62, 2.61
2.49
2.37
2.16
1.76
1.66
1.53
1.44
1.42
SnO 2 (t)
Co 3 O 4 (c)
SnO 2 (t)
CoO(c)
Co 3 O 4 (c)
SnO 2 (t)
SnO 2 (t)
CoO(c)
Co 3 O 4 (c), SnO 2 (t)
SnO 2 (t)
Co 3 O 4 (c)
SnO 2 (t), CoO(c), Co 2 SnO 4 (c)
Co 3 O 4 (c)
SnO 2 (t)
SnO 2 (t)
Co 3 O 4 (c)
SnO 2 (t)
SnO 2 (t)
Co 3 O 4 (c)
SnO 2 (t)
Co 3 O 4 (c)
SnO 2 (t)
Co 2 SnO 4 (c)
SnO 2 (t)
Co 2 SnO 4 (c)
SnO 2 (t)
CoO(c), Co 2 SnO 4 (c)
Co 2 SnO 4 (c)
SnO 2 (t)
Co 2 SnO 4 (c)
SnO 2 (t)
Co 2 SnO 4 (c)
Co 2 SnO 4 (c)
SnO 2 (t)
SnO 2 (t)
For the Ni(II)/Co(II)-doped SnO 2 catalyst (see Table 2), calcination at 400 C shows
the same phase changes with the Co(II)-doped SnO 2 catalyst at the same temperature.
But at 600 C calcination, phase changes that occurred is identified as Co 3 O 4 with