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Journal of magnetics v.7 no.2, 2002년, pp.25 - 28   피인용횟수: 1

Charge Transformation of CU-ions in CuxFe3-xO4 (χ=0.1, 0.2)

Lee, Choong Sub   (Department of Physics, Pukyong National UniversityUU0000598  ); Lee, Chan Young   (Department of Physics, Pukyong National UniversityUU0000598  ); Kwon, Dong Wook   (Department of Physics, Pukyong National UniversityUU0000598  );
  • 초록

    Slowly cooled $Cu_xFe_{3-x}O_4$ ( $\chi$ =0.1, 0.1, 0.2) have been investigated over a temperature range from 82 to 700 K using the M $\ddot{o}$ ssbauer technique. X-ray diffraction shows that these have a single-phase cubic spinel structure of lattice parameters $\alpha$ =8.396 a 8.396 and 8.398 ${\AA}$ , respectively. Since Cu ions prefer B (octahedral) sites to A (tetrahedral) sites, the ionic distribution is $(Fe)_A[Fe_{2-x}Cu_x]_BO_4$ . M $\ddot{o}$ ssbauer spectra consisted of two sets of 6-line pattern from. A site in ferric state and B site in ferrous-ferric state. Intensity ratio of B to A subspectra is 1.0 at 82 K and increases to 2.0 at 700 K with increasing temperature. After annealing the samples under vacuum at $450^circ{C}$ for a half hour, x-ray diffraction patterns have the peaks of magnetite- and hematite-phase. Lattice constants of magnetite-phase are 8.395 and 8.392 ${\AA}$ smaller than 8.396 and 8.398 ${\AA}$ before annealing, respectively. M $\ddot{o}$ ssbauer spectra reveal the conventional magnetite pattern with the additional hematite pattern. Intensity ratios of B to A subspectra fur magnetite-phase become 1.9-2.0 over all temperature ranges and Cu ions are distributed over A and B sites randomly. Ratios of hematite to total intensity in M $\ddot{o}$ ssbauer spectra for $\chi$ = 0.1 0.1 and $\chi$ = 0.2 0.2 are 10 and 21%, respectively. These hematite ratios may be due to annealing under vacuum at $450^circ{C}$ , which transforms $Cu^{2+}$ ionic states into $Cu^{1+}$ . Verwey temperatures far $\chi$ = 0.1 0.1 and $\chi$ = 0.2 0.2 are $123\pm2$ K and $128\pm2$ K.


  • 주제어

    Mössbauer .   Verwey .   magnetite .   hematite .   electron-hopping .   substituted ferrite.  

  • 참고문헌 (11)

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  • 이 논문을 인용한 문헌 (1)

    1. Koh, Jae-Gui 2002. "A Study on Physical Properties Of Co3O4-added Ni- Zn Ferrite at High Frequency" 한국재료학회지 = Korean journal of materials research, 12(10): 791~795     

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