Journal of Materials Science

, Volume 43, Issue 12, pp 4192–4197 | Cite as

Influence of silver doping on the physical properties of Mg ferrites

  • N. OkashaEmail author


The physical properties of silver substituted magnesium ferrite MgAgxFe2−xO4 (0.0 ≤ x ≤1) have been studied as a function of silver ion concentration. The samples were prepared using the flash combustion technique. The effect of Ag content on microstructure and magnetic properties has been studied. X-ray diffraction (XRD) analysis reveals the spinel structure besides metallic silver particle at all concentrations. The decrease in the lattice constant with increasing Ag up to the critical concentration (x = 0.2) was discussed. The close agreement of the theoretical and experimental lattice constant ratio from XRD pattern supports the occupancy of silver on the tetrahedral sites. The morphological features were studied using scanning electron microscope. The magnetic susceptibility, Curie temperature (TC), and effective magnetic moment (μeff) were decreased with compositional parameter. The DC electrical conductivity of the investigated samples was measured and the results indicated the increase in conductivity with increasing Ag content from 5.6 × 104 at x = 0 to 12.6 × 104Ω−1 cm−1 at x = 1. The transition from the ferrimagnetic to paramagnetic state is accompanied by an increase in the thermo EMF. Ag–Mg ferrite shows p-type conductivity at all concentrations of Ag particles where the creation of lattice vacancies is due to presence of Ag+ ions gives rise to the p-type conductivity.


Ferrite Thermoelectric Power Magnetic Field Intensity Cation Distribution Effective Magnetic Moment 


  1. 1.
    Ahmed MA, El-Khawas EH, Hassan MY, El-Desoky M (2000) Indian J Phys 74A(6):451Google Scholar
  2. 2.
    Ahmed MA, Ateia E, El-Dek SI (2002) J Vib Spectrosc 30:69CrossRefGoogle Scholar
  3. 3.
    Amer MA (2000) Phys Status Solidi A 181:539CrossRefGoogle Scholar
  4. 4.
    Goldman A (1990) Modern ferrite technology. Van Nostrand, New YorkGoogle Scholar
  5. 5.
    Augustin CO, Prabhakaran D, Srinivasan LK (1993) J Mater Sci Lett 12:383CrossRefGoogle Scholar
  6. 6.
    McMillan JA (1960) J Inorg Nucl Chem 13:28CrossRefGoogle Scholar
  7. 7.
    Scatturin V, Bellom P, Salkind AJ (1960) Ric Sci 30:1034Google Scholar
  8. 8.
    Reiding AB, Kazarnovski IAK (1951) Dokl Akad Nauk SSSR 78:713Google Scholar
  9. 9.
    Schwab GM, Hartmann G (1955) Z Anorg Allg Chem 281:183CrossRefGoogle Scholar
  10. 10.
    Mckie AS, Clark AD (1963) Batteries, vol 285. Pergamon, OxfordGoogle Scholar
  11. 11.
    Behera D, Nishra ND, Patnaik K (1997) J Supercond 10:27CrossRefGoogle Scholar
  12. 12.
    Sperka G, Fritzer HP (1988) J Solid State Commun 65:1275CrossRefGoogle Scholar
  13. 13.
    Song K-H, Dou S-X, Sorrell CC (1991) J Phys C 185:2387CrossRefGoogle Scholar
  14. 14.
    Prout EG, Thompkins FC (1946) Trans Faraday Soc 42:468CrossRefGoogle Scholar
  15. 15.
    Prout EG, Sole MJ (1959) J Inorg Nucl Chem 9:232CrossRefGoogle Scholar
  16. 16.
    Boonstra G (1968) Acta Cryst B 24:1053CrossRefGoogle Scholar
  17. 17.
    Chang FM, Jansen M (1984) Krist Z 169:295CrossRefGoogle Scholar
  18. 18.
    Balagopal N, Warrier KGK, Damodaran AD (1991) J Mater Sci Lett 10:1116CrossRefGoogle Scholar
  19. 19.
    Assal J, Hallstedt B, Gauckler LJ (1997) J Am Ceram Soc 80:3054CrossRefGoogle Scholar
  20. 20.
    Verwey EJ, Heilman EL (1947) J Chem Phys 15:174CrossRefGoogle Scholar
  21. 21.
    Kulkarni R, Joshi H (1985) Solid State Commun 53:1005CrossRefGoogle Scholar
  22. 22.
    Mazen SA, Abdallah MH, Sabrah BA, Hashem HAM (1992) Phys Status Solidi A 134:263CrossRefGoogle Scholar
  23. 23.
    Wang S-F, Wang Y-R, Yang TCK, Wang P-O, Lu C-A (2000) J Mag Mag Mater 217:35CrossRefGoogle Scholar
  24. 24.
    Dogra A, Kumar R, Khan SA, Sivakumar VV, Singh M (2004) Nucl Instrum Meth Phys B 225:283CrossRefGoogle Scholar
  25. 25.
    Shaikh AM, Kanamadi CM, Chougule BK (2005) J Mater Chem Phys 215:103Google Scholar
  26. 26.
    Abdel Malik Md, Reddy VD, Venugopal Reddy P, Sagar DR, Prankishan (1994) J Mod Phys Letts 16:947CrossRefGoogle Scholar
  27. 27.
    Ravinder D (1999) J Alloys Comps 291:208CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Physics Department, Girls CollegeAin Shams UniversityCairoEgypt

Personalised recommendations