Table 3.
The following crystallographic parameters of nanoparticles with a constant degree of metal doping were determined by XRD as a function of heat treatment temperature: grain size, strain, lattice constant. Here, only Fe3O4 phase was detected, and no traces of α-Fe2O3 phase (a.p.—as prepared).
| Name | Size (nm) ± 1 |
Strain [103] ± 0.5 |
Fe3O4 Cell Size (Å) ± 0.02 |
|---|---|---|---|
| Co0.20 a.p. | 11 | 2.1 | 8.38 |
| Co0.20 50 °C | 12 | 2.1 | 8.39 |
| Co0.20 100 °C | 12 | 1.2 | 8.38 |
| Co0.20 150 °C | 13 | 3.2 | 8.38 |
| Co0.20 200 °C | 13 | 3.2 | 8.37 |
| Co0.20 250 °C | 12 | 2.8 | 8.37 |
| Co0.20 300 °C | 10 | 4.7 | 8.35 |
| Co0.20 350 °C | 11 | 1.7 | 8.34 |
| Co0.20 400 °C | 12 | 3.1 | 8.34 |
| Co0.20 450 °C | 12 | 2.5 | 8.36 |
| Co0.20 500 °C | 12 | 1.7 | 8.36 |
| Mn0.20 a.p. | 10 | 5.1 | 8.42 |
| Mn0.20 50 °C | 10 | 4.7 | 8.42 |
| Mn0.20 100 °C | 10 | 4.5 | 8.41 |
| Mn0.20 150 °C | 11 | 4.6 | 8.39 |
| Mn0.20 200 °C | 10 | 4.7 | 8.38 |
| Mn0.20 250 °C | 11 | 4.7 | 8.37 |
| Mn0.20 300 °C | 12 | 2.1 | 8.36 |
| Mn0.20 350 °C | 11 | 3.9 | 8.33 |
| Mn0.20 400 °C | 11 | 3.4 | 8.33 |
| Mn0.20 450 °C | 11 | 3.5 | 8.34 |
| Mn0.20 500 °C | 11 | 3.9 | 8.35 |
| Ni0.20 a.p. | 10 | 2.8 | 8.36 |
| Ni0.20 50 °C | 11 | 2.4 | 8.36 |
| Ni0.20 100 °C | 12 | 2.8 | 8.37 |
| Ni0.20 150 °C | 12 | 2.4 | 8.35 |
| Ni0.20 200 °C | 12 | 2.4 | 8.34 |
| Ni0.20 250 °C | 12 | 3.1 | 8.34 |
| Ni0.20 300 °C | 12 | 3.1 | 8.34 |
| Ni0.20 350 °C | 12 | 2.8 | 8.34 |
| Ni0.20 400 °C | 12 | 2.5 | 8.33 |
| Ni0.20 450 °C | 11 | 1.7 | 8.34 |
| Ni0.20 500 °C | 12 | 2.6 | 8.33 |