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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Ping-chun Tsai Xiaoding Qi Yu-Jhan Siao |
| Copyright Year | 1965 |
| Abstract | High-purity Tb3Fe5O12 samples were prepared by the solid-state reaction method at 1300-1390 $,,^{circ} $C and their magnetic and dielectric properties were studied. The results showed that although the magnetic properties did not change notably with the processing conditions used, the dielectric behaviors of the polycrystalline Tb3Fe5O12 were affected significantly. The increase of sintering temperature from 1300 to 1390°C resulted in a dramatic increase in bulk density, dielectric constant and loss-peak frequency, but a decrease in the $alpha$ parameter of the Cole-Cole equation. The Fe2+-Fe3+ hopping process was proposed for the observed dielectric behaviors. The hopping activation energy, calculated by the Arrhenius plots, decreased from 0.438 to 0.289 eV as the sintering temperature increased from 1300 to 1390°C . The Cole-Cole equation could be used to describe the relaxation behaviors of these samples and the calculated α parameter decreased from 0.305 to 0.059. High sintering temperature had both the effects of improving crystallinity and enhancing the Fe3+ → Fe2+ reduction. The former lowered the hopping activation energy and narrowed the distribution of the relaxation time (as indicated by α → 0), while the later increased the dielectric constant and loss, as well as the DC conduction in the low frequency region. |
| Sponsorship | IEEE Magnetics Society |
| Starting Page | 4307 |
| Ending Page | 4310 |
| Page Count | 4 |
| File Size | 1703587 |
| File Format | |
| ISSN | 00189464 |
| Volume Number | 49 |
| Issue Number | 7 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2013-07-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Iron Dielectrics Temperature Temperature measurement Frequency measurement Equations Garnets Terbium iron garnet Cole–Cole equation dielectric behavior ferrimagnetism |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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