Advances in Materials Science and Engineering

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 (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-Al₂O₃; Cubic
	400	45.86	528	1.97	1.19	7.50	γ-Al₂O₃; Cubic
	311	37.56	426	2.39	1.17	7.40	γ-Al₂O₃; Cubic
	= 1250°C
	113	43.44	3346	2.08	0.29	30.50	α-Al₂O₃; Hexagonal
	104	35.23	3031	2.54	0.28	31.00	α-Al₂O₃; Hexagonal
	116	57.59	2774	1.59	0.32	28.87	α-Al₂O₃; Hexagonal
	012	25.62	1885	3.46	0.27	30.53	α-Al₂O₃; Hexagonal

Urea	= 1000°C
	440	67.11	705	1.39	1.153	8.60	γ-Al₂O₃; Cubic
	400	45.96	499	1.97	0.999	8.90	γ-Al₂O₃; Cubic
	311	37.52	446	2.39	1.3	6.70	γ-Al₂O₃; Cubic
	104	35.23	289	2.54	0.227	38.24	α-Al₂O₃; Hexagonal
	113	43.519	180	2.07	0.303	29.40	α-Al₂O₃; Hexagonal
	106	57.57	155	1.59	0.255	37.02	α-Al₂O₃; Hexagonal
	= 1250°C
	113	43.48	3608	2.07	0.29	30.72	α-Al₂O₃; Hexagonal
	104	35.28	3334	2.54	0.27	31.23	α-Al₂O₃; Hexagonal
	116	57.63	2980	1.59	0.32	29.14	α-Al₂O₃; Hexagonal
	012	25.0	2386	3.46	0.26	32.00	α-Al₂O₃; Hexagonal