Structural and Morphological Features of Disperse Alumina Synthesized Using Aluminum Nitrate Nonahydrate

Table 1 Conditions of preparation samples and their composition

Sample	Calcination temperature (°C)	Time of calcination (min)	Structural state	Phase composition
1	350	40	Amorphous	AlONO₃·H₂O (90 %)
1	350	40	Amorphous	AlOOH (10 %)
2	480	40	Amorphous/crystalline	AlONO₃·H₂O (30 %)
2	480	40	Amorphous/crystalline	AlOOH (70 %)
3	850	40	Amorphous/crystalline	γ-Al₂O₃
4	1100	40	Crystalline	α-Al₂O₃