期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 691, 期 -, 页码 672-682出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.08.316
关键词
Rare-earth iron garnet; Dielectric; Debye relaxation; Maxwell-Wagner effect
资金
- Ministry of Science and Technology, Taiwan [NSC-102-2221-E-006-057-MY3]
- National Cheng Kung University via the Top University Projects
Rare-earth iron garnets (RIG, R = Y, Tb and Lu) were sintered at 1350 degrees C. Their crystal structures were refined by the Rietveld method, which showed that the oxygen coordination polyhedra were highly distorted. X-ray photoelectron spectroscopy revealed a similar Fe2+/Fe3+ ratio (similar to 27/73) in different RIGs. The origins of dielectric responses were identified by cross examination of the permittivity, modulus and impedance presentations. Fitting experimental data with the Debye-type and Maxwell-Wagner models revealed that the dielectric relaxation at room temperature was dominated by the Debye-type process but as temperature increased, the Maxwell-Wagner effect gradually took over. The static permittivity was 750, 785 and 2653 for YIG, TbIG and LuIG, respectively. The particularly large permittivity of LuIG arose from a large difference between the distortions of FeO6 and FeO4 in the structure and therefore, a large dipole moment was created when electron hopping between the octahedral and tetrahedral sites took place. (C) 2016 Elsevier B.V. All rights reserved.
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