No | samples | a = b = c (Å) | density (nm) | ¡ = β = α |
1 | ZnFe2O4 | 8.441 | 2.54 | 90˚ |
2 | CuFe2O4 | 8.349 | 2.532 | 90˚ |
3 | NiFe2O4 | 8.352 | 2.492 | 90˚ |