![Normal spinel structure
eight divalent metal ions(M2+) occupy
tetrahedral or A-sites and 16 trivalent
metal ions(Fe3+) occupy octahedral or
B-sites
usual notation for this structure is
M2+[Fe2
3+]O4](https://image.slidesharecdn.com/farritesoffabrick-150504085530-conversion-gate02/85/Farrites-of-fabrick-4-320.jpg)
![Inverse spinel structure
eight divalent metal ions(M2+) occupy
octahedral or B-sites and 16 trivalent
metal ions(Fe3+) occupy tetrahedral or
A-sites
usual notation for this structure is
Fe3+[Fe3+M2+]O4](https://image.slidesharecdn.com/farritesoffabrick-150504085530-conversion-gate02/85/Farrites-of-fabrick-6-320.jpg)
Farrites of fabrick
- 1. Ferrites
- 2. Outlines Crystal structure of ferrites Normal spinel structure Inverse spinel structure Magnetisation in a ferrite molecule Application of ferrites
- 3. Crystal structure of ferrites Ferrites are compounds of iron oxides with oxides of other metals General chemical formula - MOFe2O3 or MFe2O4 Metal ions in tetrahedral and octahedral sites
- 4. Normal spinel structure eight divalent metal ions(M2+) occupy tetrahedral or A-sites and 16 trivalent metal ions(Fe3+) occupy octahedral or B-sites usual notation for this structure is M2+[Fe2 3+]O4
- 6. Inverse spinel structure eight divalent metal ions(M2+) occupy octahedral or B-sites and 16 trivalent metal ions(Fe3+) occupy tetrahedral or A-sites usual notation for this structure is Fe3+[Fe3+M2+]O4
- 8. Magnetisation The saturation magnetisation may be calculated from the number of unpaired spins of the ions Unbalanced magnetic spins in iron
- 9. Continued Ground state spin direction in iron ferrite with inverse spinel structure
- 10. Continued Ground state spin direction in M2+Fe2O4 ferrite with inverse spinel structure
- 12. Application Soft magnetic ferrites are used in the production of cores for inductor coils used in telecommunications Used in microwave applications such as isolator Increase the sensitivity and selectivity of the receiver used in radio production of ultrasonic waves
- 13. Continued Storing information devices such as magnetic tapes or discs Hard magnetic ferrites are used in manufacturing permanent magnets ferrox cube are used in switching circuits, matrix storage and in shift registers of components e.g. Magnesium-magnese ferrite