1. Al2O4
2. Al2O3
3. Al3O4
4. AlO2
Al2O3
1. 24/3 πr3
2. 12/3 πr3
3. 16/3 πr3
4. 20/3 πr3
16/3 πr3
1. Ionic crystal
2. Molecular crystal
3. Covalent crystal
4. Metallic crystal
Ionic crystal
1. d=nλsinθ
2. λd=(2sinθ) /n
3. λ=(2dsinθ) /n
4. nλ=dsin2θ
λ=(2dsinθ) /n
1. 0.224 - 0.414
2. 0.414 - 0.526
3. 0.414 - 0.732
4. 0.732 - 1.0
0.414 - 0.526
1. Cubic
2. Hexagonal
3. Triclinic
4. Orthorhombic
Triclinic
1. 1
2. 2
3. 4
4. 8
4
1. Na2Fe2O4
2. MgFe2O4
3. AlFe2O4
4. Zn3FeO4
MgFe2O4
1. 6
2. 8
3. 10
4. 12
8
1. Triclinic
2. Rhombohedral
3. Tetragonal
4. Isomorphous
Isomorphous