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Journal of the Korean Ceramic Society 2001;38(11): 1008. |
| 졸-겔법에 의한 Cerium 치환 Nanosize YIG 분말의 합성 및 자기적 특성 |
| 장학진, 김광석1, 윤석영, 김태옥 |
부산대학교 무기재료공학과
1광주과학기술원 신소재공학과 |
| Synthesis and Magnetic Properties of Nanosized Ce-substituted Yttrium Iron Garnet Powder Prepared by Sol-gel Method |
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| ABSTRACT |
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Nanosize YIG powders added by Cerium which is exellent element in magneto-optical effect were synthesized by Sol-Gel method using Ethylene Glycol solvent. In 120 to 150 minute reaction time, stable sol solution which showed no change in viscosity, pH, and aging time was obtained. Monolithic YIG was synthesized at 80$0^{circ}C$ with DTA and XRD measurement and its lattice parameter had a tendency to increase from 12.3921 $AA$. Increasing annealing temperature from 80$0^{circ}C$ to 105$0^{circ}C$, average particle size was in the range of 40 nm to 330 nm. Saturation magnetization (M$_{s}$) value was increased from 18.37 to 21.25 emu/g due to enhancement of YIG crystallity and decreasing of orthoferrite phase. On the other hand, coercivity (H$_{c}$) value increased up to 90$0^{circ}C$ and then decreased above 90$0^{circ}C$. With increasing Ce addition, coercivity was almost not changed but saturation magnetization value was maximum at Ce 0.1 mol% and then decreased because of increasing a orthoferrite amount. Also, curie temperature (T$_{c}$) of YIG were not changed with Ce addition.ion. |
| Key words:
Yttrium Iron Garnet(YIG), Sol-Gel method, Saturation magnetization($M_{s}$), Cercivity($H_c$), Curie temperature($T_c$) |
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