Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 95, Issue 5, Pages 1671-1675Publisher
WILEY
DOI: 10.1111/j.1551-2916.2011.05065.x
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Funding
- National Science Foundation of China [50872121, 50832005]
- Zhejiang Provincial Natural Science Foundation of China [Y4110201]
- Qianjiang Project of Zhejiang Province [2009R10038]
- Zhejiang Provincial Top Key Discipline of New Materials and Process Engineering
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Structure, dielectric response, and magnetic properties of Y3Fe5-xAlxO12 (x = 0, 0.5, 1, 2, and 3) ceramics were investigated. X-ray diffraction (XRD) patterns indicate a single phase with garnet structure in space group Ia3d for all sintered samples. Rietveld refinement of XRD data suggest that Al3+ substitutes for Fe3+ at tetrahedral sites. All the samples show a giant dielectric response which originates from the charge carrier hopping between the Fe2+ and Fe3+. The activation energy of the hopping process increases with increasing Al substitution. The a-d super-exchange interaction becomes weak as the content of Al increases, which results in the decrease of saturation magnetizations and magnetic ordering temperatures.
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