Table 5: Variation of crystallite size lattice parameters cell volume, X-ray density, and bandgap energy of co-doped Zn2+ and La3+ ions Fe3O4 nanopowders doped with different La3+ ion molar ratios and synthesized via co-precipitation route under O2 atmosphere at room temperature.
| La3+ ions molar ratios | Formed phase | Crystallite size, Dx (nm) | Lattice constant, a (Å) | Unit cell volume, V (Å3) | X-ray density, dx (g/cm3) | Optical bandgap energy (eV) |
| 0.00 | Fe3O4 | 9.0 | 8.358 | 583.801 | 8.756 | 1.80 |
| 0.10 | 7.1 | 8.382 | 588.987 | 9.2513 | 1.98 | |
| 0.15 | 3.9 | 8.465 | 606.646 | 9.2600 | 1.92 | |
| 0.20 | 7.3 | 8.432 | 599.558 | 9.651 | 1.87 | |
| 0.25 | 6.0 | 8.466 | 606.696 | 9.8153 | 2.02 | |
| 0.30 | 6.5 | 8.401 | 592.918 | 10.328 | 1.95 | |