التفاصيل البيبلوغرافية
| العنوان: |
Microstructure characterization of polycrystalline yttrium iron garnets (YIGs) sintered from the calcined sol-gel powder. |
| المؤلفون: |
Kim, Min-Ji1 (AUTHOR), Ok, Hye-Jin1 (AUTHOR), Son, Youngkyun1 (AUTHOR), Gu, Guiyoung2 (AUTHOR), Suh, Dong-Woo2 (AUTHOR), Lee, Ki-Suk1 (AUTHOR) kisuk@unist.ac.kr, Lee, Sukbin1 (AUTHOR) sukbinlee@unist.ac.kr |
| المصدر: |
Materials Characterization. Dec2022, Vol. 194, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
*YTTRIUM iron garnet, *CRYSTAL grain boundaries, *POWDERS, *MICROSTRUCTURE, *PARTICLE size distribution, *OSTWALD ripening |
| مستخلص: |
We present the results of microstructural characterization of the polycrystalline yttrium iron garnet (YIG) during high temperature sintering. Three YIG samples, compacted from the calcined sol-gel powder, are annealed at 1400 °C for 350 min, 1050 min and 1750 min, respectively. During the annealing, the polycrystalline YIG coarsens via normal grain growth, developing self-similar steady-states in grain size distribution, grain texture, and grain boundary texture. However, the 1050-min and 1750-min samples feature x-ray peaks with narrower full width at half-maximum (FWHM), and smaller local misorientation than the 350-min one, signifying that the strain still decreases after annealing for 350 min at 1400 °C. EPMA analyses show that more uniform distribution of the elements is found in 1750-min sample than in 350-min sample. Notably, little segregation of metal elements is observed on the grain boundary of the current YIG samples, as opposed to previously reported conventionally sintered YIGs using yttrium-oxide and iron-oxide powders, often featuring either second phases or segregation of Fe on YIG grain boundaries. [Display omitted] • The high-density polycrystalline yttrium iron garnet (YIG) is sintered using calcined sol-gel powders. • Microstructure coarsens via normal grain growth, maintaining the self-similarity in grain size distribution, grain texture, and grain boundary misorientation and texture. • X-ray and KAM measurements suggest that the lattice strain reduces during annealing. • Considering observed slow growth kinetics, both sharpening of the X-ray peaks and decrease in the KAM may result from the homogenization of elements during annealing, producing the concurrent reduction in the lattice strain. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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