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Nuclear Science Journal of Malaysia, Vol. 18, No. 2, Dec 2000 35
Table 1: Peak positions (2) in the XRD patterns of Co(II)-doped SnO 2 (30:70)
Temperature (C) 2 () d/Å d/Å(PDF) Assignment
26.48
34.01
3.36
2.63
3.35
2.64, 2.62
SnO 2 (t)
SnO 2 (t), CoO(c)
400
37.06 2.42 2.44
Co 3 O 4 (c)
37.98 2.37 2.37
SnO 2 (t)
52.33
64.70
1.75
1.44
1.76
1.43, 1.42
SnO 2 (t)
Co 3 O 4 (c), SnO 2 (t)
600
800
1000
t: tetragonal, c: cubic
26.63
33.79
36.70
38.17
51.80
54.26
64.75
19.02
26.75
31.28
34.01
36.93
38.04
39.14
44.99
51.97
54.87
57.98
59.38
62.00
65.42
66.03
17.93
26.77
29.38
34.09
34.55
36.18
38.10
41.94
51.97
55.35
58.16
60.63
62.13
64.99
66.27
3.34
2.65
2.45
2.36
1.76
1.69
1.44
4.66
3.33
2.86
2.63
2.43
2.36
2.30
2.01
1.76
1.67
1.59
1.56
1.50
1.43
1.41
4.94
3.33
3.04
2.63
2.59
2.48
2.36
2.15
1.76
1.66
1.58
1.53
1.49
1.43
1.41
3.35
2.64, 2.62
2.44
2.37
1.76
1.68
1.43, 1.42
4.67
3.35
2.86
2.64, 2.62, 2.61
2.44
2.37
2.31
2.02
1.76
1.68
1.59
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
1.59
1.53
1.50
1.44
1.42
SnO 2 (t)
SnO 2 (t), CoO(c)
Co 3 O 4 (c)
SnO 2 (t)
SnO 2 (t)
SnO 2 (t)
Co 3 O 4 (c), SnO 2 (t)
Co 3 O 4 (c)
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)
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)
SnO 2 (t)
Co 2 SnO 4 (c)
SnO 2 (t)
SnO 2 (t)
SnO 2 (t)
Co(II)-doped SnO 2 catalyst (see Table 1) calcined at 400 C shows the existence of tin
oxide (SnO 2 ) tetragonal phase and cobalt oxide (Co 3 O 4 and CoO) cubic phase. All