Zinc ferrite

Zinc ferrites are a series of synthetic inorganic compounds of zinc and iron (ferrite) with the general formula of ZnxFe3−xO4. Zinc ferrite compounds can be prepared by aging solutions of Zn(NO3)2, Fe(NO3)3, and triethanolamine in the presence and in the absence of hydrazine,[1] or reacting iron oxides and zinc oxide at high temperature. Spinel (Zn, Fe) Fe2O4 appears as a tan-colored solid that is insoluble in water, acids, or diluted alkali.[2] Because of their high opacity, zinc ferrites can be used as pigments, especially in applications requiring heat stability. For example, zinc ferrite prepared from yellow iron oxide can be used as a substitute for applications in temperatures above 350 °F (177 °C).[3] When added to high corrosion-resistant coatings, the corrosion protection increases with an increase in the concentration of zinc ferrite.[4] A recent investigation shows that the zinc ferrite, which is paramagnetic in the bulk form, becomes ferrimagnetic in nanocrystalline thin film format.[5] A large room temperature magnetization and narrow ferromagnetic resonance linewidth have been achieved by controlling thin films growth conditions.[6]

See also

References
  1. Andrés Vergés, M.; Martinez, M.; Matijevié, E. (1993). "Synthesis and characterization of zinc ferrite particles prepared by hydrothermal decomposition of zinc chelate solutions". Journal of Materials Research. 8 (11): 2916. Bibcode:1993JMatR...8.2916A. doi:10.1557/JMR.1993.2916.
  2. "Zinc Ferrites". Nubiola.com. Archived from the original on March 5, 2010. Retrieved 25 March 2010.
  3. "Zinc Ferrite". Hoover Color Corporation. Retrieved 25 March 2010.
  4. Ayana, Y. M. A.; El-Sawy, S. M.; Salah, S. H. (1997). "Zinc-ferrite pigment for corrosion protection". Anti-Corrosion Methods and Materials. 44 (6): 381–388. doi:10.1108/00035599710367681.
  5. Bohra, M.; Prasad, S.; Kumar, N.; Misra, D. S.; Sahoo, S. C.; Venkataramani, N.; Krishnan, R. (2006). "Large room temperature magnetization in nanocrystalline zinc ferrite thin films". Appl. Phys. Lett. 488: 262506. Bibcode:2006ApPhL..88z2506B. doi:10.1063/1.2217253.
  6. Bohra, M.; Prasad, S.; Kumar, N.; Misra, D. S.; Sahoo, S. C.; Venkataramani, N.; Krishnan, R. (2006). "Large room temperature magnetization in nanocrystalline zinc ferrite thin films". Appl. Phys. Lett. 488: 262506. Bibcode:2006ApPhL..88z2506B. doi:10.1063/1.2217253.


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