Browsing by Author "Fayek, M. K. [محمد خورشيد فائق]"

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    • Fe57 Mossbauer Study In Cobalt Substituted Magnetite 

      Fayek, M. K. [محمد خورشيد فائق]; Bahgat, A. A. ( Qatar University , 1983 , Article)
      The Mossbauer effect has been studied in the mixed ferrites CoxFe3_x04 (for x = 0.8, 0.9 and 1) with the spinel structure in the temperature range between 78 and 830K. The composition with x = 1, showed an expected Zeeman ...

    • Neutron Diffraction and Mossbauer Effect Study of a Cobalt Substituted Zinc Ferrite 

      Fayek, M. K. [محمد خورشيد فائق] ( Qatar University , 1982 , Article)
      The mixed cubic ferrite Zno.g5 €00.15 Fez 04 is studied by neutron diffraction and Mossbauer effect techniques at the temperature range 4.2 - 293 °K. The obtained spectra by both methods at low temperature show a long range ...

    • Neutron Diffraction And Mossbauer Effect Study On A Mixed Rare Earth Garnet 

      Fayek, M. K. [محمد خورشيد فائق]; Moberg, L.; Abbas, Y.; Bahgat, A. A. ( Qatar University , 1983 , Article)
      A powder sample of Y^YbFesO,; was prepared using the ceramic technique. X-ray diffraction pattern showed a single phase of the garnet type structure with a lattice constant 12.323 A". Specific heat for this composition was ...

    • ON THE CRYSTAL AND HYPERFINE PARAMETERS OF THE HEXAGONAL Ba Cax Sr1_xFe4 O8 MONOFERRITES 

      Fayek, M. K. [محمد خورشيد فائق]; Abbas, Y.; Elnimr, M.; Saleh, H. ( Qatar University , 1983 , Article)
      The alkaline earth monoferrites BaCaxSr1-xFe4O8 with X = 0,0.5and 1, were studied by Mossbauer spectroscopy and neutron diffractometry over a wide range of temperatures (78 - 900 K). The lattice constants were obtained ...