Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Synthesis and Magnetic Properties of Nanosized Ce-substituted Yttrium Iron Garnet Powder Prepared by Sol-gel Method

졸-겔법에 의한 Cerium 치환 Nanosize YIG 분말의 합성 및 자기적 특성

  • 장학진 (부산대학교 무기재료공학과) ;
  • 김광석 (광주과학기술원 신소재공학과) ;
  • 윤석영 (부산대학교 무기재료공학과) ;
  • 김태옥 (부산대학교 무기재료공학과)
  • Published : 2001.11.01
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Abstract

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.

Nanosize의 YIG 분말을 자기광학효과에 뛰어난 첨가제인 Cerium을 첨가하여 에틸렌 글리콜 용매로서 졸-겔법을 이용하여 합성하였다. 점도와 pH가 일정한 값을 유지하고, aging시간에 따라 점도변화가 없는 120분에서 150분사이의 반응시간에서 가장 안정한 상태의 용액을 얻을 수 있었다. 건조시킨 YIG 분말로서 DTA 및 XRD 측정결과 80$0^{\circ}C$에서 단일상의 YIG를 합성할 수 있었고, Cerium 첨가량 증가에 따라 12면체 Y 이온 자리로의 치환에 의해 격자상수가 12.3921에서 12.4130$\AA$까지 증가하는 경향을 보였다. 80$0^{\circ}C$에서 105$0^{\circ}C$까지 열처리 온도 증가에 따라 평균입자크기는 40nm~330nm정도를 보였고, 포화자화값(M$_{s}$)은 YIG 결정성 증대 및 미량의 orthoferrite의 감소에 의해 18.37~21.25emu/g으로 증가하였으며, 보자력(H$_{c}$)은 80$0^{\circ}C$부터 90$0^{\circ}C$ 사이에서는 증가하다가, 그 이상 온도에서는 감소하는 경향을 보였다. Ce 첨가량이 증가함에 따른 보자력값은 큰 변화가 없었으며, 포화자화값은 0.1 mol%일 때 가장 큰 값을 지녔고, 이후 미량의 orhtoferrite 증가로 인해 감소하는 경향을 보였으나, 큐리 온도(T$_{c}$)에는 영향을 미치지 않았다.않았다.

Keywords

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