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Advances in Materials Science and Engineering
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Advances in Materials Science and Engineering
/
2013
/
Article
/
Tab 2
/
Research Article
Comparison of Urea and Citric Acid Complexing Agents and Annealing Temperature Effect on the Structural Properties of
- and
-Alumina Nanoparticles Synthesized by Sol-Gel Method
Table 2
Summary of XRD measurements for Al
2
O
3
samples.
Complexing agent
2
θ
(deg)
Intensity
(cps)
(Å)
Lattice distance
FWHM
(deg)
(nm)
Crystalite size
Identification with
(
) value
Citric acid
= 1000°C
440
67.08
712
1.39
1.14
8.60
γ
-Al
2
O
3
; Cubic
400
45.86
528
1.97
1.19
7.50
γ
-Al
2
O
3
; Cubic
311
37.56
426
2.39
1.17
7.40
γ
-Al
2
O
3
; Cubic
= 1250°C
113
43.44
3346
2.08
0.29
30.50
α
-Al
2
O
3
; Hexagonal
104
35.23
3031
2.54
0.28
31.00
α
-Al
2
O
3
; Hexagonal
116
57.59
2774
1.59
0.32
28.87
α
-Al
2
O
3
; Hexagonal
012
25.62
1885
3.46
0.27
30.53
α
-Al
2
O
3
; Hexagonal
Urea
= 1000°C
440
67.11
705
1.39
1.153
8.60
γ
-Al
2
O
3
; Cubic
400
45.96
499
1.97
0.999
8.90
γ
-Al
2
O
3
; Cubic
311
37.52
446
2.39
1.3
6.70
γ
-Al
2
O
3
; Cubic
104
35.23
289
2.54
0.227
38.24
α
-Al
2
O
3
; Hexagonal
113
43.519
180
2.07
0.303
29.40
α
-Al
2
O
3
; Hexagonal
106
57.57
155
1.59
0.255
37.02
α
-Al
2
O
3
; Hexagonal
= 1250°C
113
43.48
3608
2.07
0.29
30.72
α
-Al
2
O
3
; Hexagonal
104
35.28
3334
2.54
0.27
31.23
α
-Al
2
O
3
; Hexagonal
116
57.63
2980
1.59
0.32
29.14
α
-Al
2
O
3
; Hexagonal
012
25.0
2386
3.46
0.26
32.00
α
-Al
2
O
3
; Hexagonal