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      Determination of Non-stoichiometric Numbers of Ferrite Powders by Neutron Diffractometry

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      https://www.riss.kr/link?id=E805651

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      For the development of high performance of ferrite powders with a wide range of electromagnetic shielding properties, non-stoichiometric number of the ferrites such as Ni_(x)Zn_(1-x)Fe_(2)O_(4) was controlled during a combustion synthesis reaction. The non-stoichiometric number of the ferrites was determined by neutron diffractometry. The final stoichiometries of the Ni_(x)Zn_(1-x)Fe_(2)O_(4) powders at different oxygen partial pressures were Ni_(0.33)Zn_(0.6)7Fe_(2)O_(4) and Ni_(0.36)Zn_(0.64)Fe_(2)O_(4), respectively, which supports that reaction mechanism involves the competitive redox reaction of zinc oxide, nickel oxide and iron. Coercive force and residual magnetization of the ferrite decreased, whereas, maximum magnetization, susceptibility and curie temperature increased with oxygen partial pressure. The magnetic property changes was related to non-stoichiometric numbers of the ferrites due to the competitive reduction reaction during the combustion reaction.
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      For the development of high performance of ferrite powders with a wide range of electromagnetic shielding properties, non-stoichiometric number of the ferrites such as Ni_(x)Zn_(1-x)Fe_(2)O_(4) was controlled during a combustion synthesis reaction. Th...

      For the development of high performance of ferrite powders with a wide range of electromagnetic shielding properties, non-stoichiometric number of the ferrites such as Ni_(x)Zn_(1-x)Fe_(2)O_(4) was controlled during a combustion synthesis reaction. The non-stoichiometric number of the ferrites was determined by neutron diffractometry. The final stoichiometries of the Ni_(x)Zn_(1-x)Fe_(2)O_(4) powders at different oxygen partial pressures were Ni_(0.33)Zn_(0.6)7Fe_(2)O_(4) and Ni_(0.36)Zn_(0.64)Fe_(2)O_(4), respectively, which supports that reaction mechanism involves the competitive redox reaction of zinc oxide, nickel oxide and iron. Coercive force and residual magnetization of the ferrite decreased, whereas, maximum magnetization, susceptibility and curie temperature increased with oxygen partial pressure. The magnetic property changes was related to non-stoichiometric numbers of the ferrites due to the competitive reduction reaction during the combustion reaction.

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      목차 (Table of Contents)

      • INTRODUCTION
      • EXPERIMENTAL
      • RESULTS AND DISCUSSION
      • SUMMARY
      • REFERENCES
      • INTRODUCTION
      • EXPERIMENTAL
      • RESULTS AND DISCUSSION
      • SUMMARY
      • REFERENCES
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