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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Yong Hui Li Sam Jin Kim Sung Yong An Chul Sung Kim |
| Copyright Year | 1965 |
| Abstract | The crystal structure of Ni0.8-xCuxZn0.2Fe2O4 (x = 0.2, 0.4, 0.6) sample is determined to be cubic spinel with space group Fd-3 m by Rietveld refinement. The lattice constant a0 increased linearly with the Cu concentration from x = 0.2 to 0.6. With increasing Cu concentration, the saturation magnetization and coercivity decreased from 101.3 emu/g, 112 Oe to 88.7 emu/g, 83 Oe, respectively, at 4.2 K. Ni and Cu ions in NiCuZn ferrite prefer octahedral sites (B) and Zn ions prefer tetrahedral sites (A). Based on the distribution probability, we have analyzed Mössbauer spectra measured at 4.2 K as 5 sets with six-lines. Hyperfine fields at A and B sites at 4.2 K with zero magnetic field were Hhf(A)=500 kOe, and Hhf(B0) =545 kOe, Hhf(B1) = 525 kOe , Hhf(B2) = 516 kOe, Hhf(B3) = 483 kOe, for x = 0.6. Applied-field Mössbauer spectra of Ni0.8-xCuxZn0.2Fe2O4 were measured parallel to the γ-ray direction under 5 T at 4.2 K. Hyperfine field Hhf(A) at A site under 5 T was 516 kOe, larger than that under zero applied-field, and at B site the average value of hyperfine field 〈Hhf(B)〉 was 440 kOe, smaller than 〈Hhf(B)〉 = 517 kOe under zero applied-field, for x = 0.6 . Then the hyperfine field at A and B sites decreased with increasing Cu content x = 0.2 to 0.6. Also, we noticed that the second and fifth absorption lines of Mössbauer spectra completely disappeared above 1 T, indicating that the spins of Fe ions at A and B sites were collinear to the applied-field. The Fe valence state was determined to be ferric from the isomer shift values. |
| Sponsorship | IEEE Magnetics Society |
| Starting Page | 4340 |
| Ending Page | 4343 |
| Page Count | 4 |
| File Size | 657813 |
| File Format | |
| ISSN | 00189464 |
| Volume Number | 47 |
| Issue Number | 10 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2011-10-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Ferrites Copper Iron Magnetometers Ions Magnetic properties Saturation magnetization spin collinear Applied-field Mössbauer spectroscopy distribution probability NiCuZn ferrite |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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