Table 6: 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 N2 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 | 6.6 | 8.453 | 603.912 | 8.464 | 1.75 |
| 0.10 | 7.0 | 8.440 | 601.250 | 9.063 | 1.83 | |
| 0.15 | 8.0 | 8.484 | 610.569 | 9.201 | 1.88 | |
| 0.20 | 8.0 | 8.449 | 603.109 | 9.594 | 1.91 | |
| 0.25 | 6.7 | 8.430 | 599.133 | 9.939 | 1.97 | |
| 0.30 | 6.6 | 8.423 | 597.685 | 10.246 | 2.02 | |