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 Al2O3 samples.

Complexing agent 2θ (deg)Intensity
Lattice distance
Crystalite size
Identification with
( ) value

Citric acid = 1000°C
44067.087121.391.148.60γ-Al2O3; Cubic
40045.865281.971.197.50γ-Al2O3; Cubic
31137.564262.391.177.40γ-Al2O3; Cubic
= 1250°C
11343.4433462.080.2930.50α-Al2O3; Hexagonal
10435.2330312.540.2831.00α-Al2O3; Hexagonal
11657.5927741.590.3228.87α-Al2O3; Hexagonal
01225.6218853.460.2730.53α-Al2O3; Hexagonal

Urea = 1000°C
44067.117051.391.1538.60γ-Al2O3; Cubic
40045.964991.970.9998.90γ-Al2O3; Cubic
31137.524462.391.36.70γ-Al2O3; Cubic
10435.232892.540.22738.24α-Al2O3; Hexagonal
11343.5191802.070.30329.40α-Al2O3; Hexagonal
10657.571551.590.25537.02α-Al2O3; Hexagonal
= 1250°C
11343.4836082.070.2930.72α-Al2O3; Hexagonal
10435.2833342.540.2731.23α-Al2O3; Hexagonal
11657.6329801.590.3229.14α-Al2O3; Hexagonal
01225.023863.460.2632.00α-Al2O3; Hexagonal

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