| Issue |
Korean Chemical Engineering Research,
Vol.43, No.1, 71-75, 2005
Vol.43, No.1, 71-75, 2005
La0.5Ca0.5MnO3 분말과 Pellet의 구조분석 및 자기적 성질
Structural Elucidation and Magnetical Properties of La0.5Ca0.5MnO3 Powders and Pellets
초거대 자기 저항 물질인 La0.5Ca0.5MnO3의 분말과 pellet을 졸-겔 법으로 제조하였다. 열처리 온도를 변화시켜 얻은 시료에 대해 FT-IR과 CP/MAS 13C solid state NMR spectroscopy 그리고 XRD 등을 이용해 구조변화를 관찰하였다. 양이온 조성 비율을 알아보기 위해 ICP-AES를 이용하였으며, 입자크기와 균일도를 FE-SEM/EDS로, 미세구조와 격자 패턴은 TEM으로 관찰하였다. VSM을 이용하여 자기적 특성을 살펴보았으며 큐리온도(Tc)는 236 K에서 측정되었다.
La0.5Ca0.5MnO3 colossal magnetoresistance (CMR) powders and pellets were synthesized by sol-gel process. The structural changes were investigated by FT-IR, CP/MAS 13C solid state NMR spectroscopy and XRD. The particle characterization, microstructure of sintered samples, and cation composition of gel powders were studied by FESEM/EDS, TEM and ICP-AES. The structure refinement reveals that La0.5Ca0.5MnO3 has orthorhombic, perovskite type unit cell. The magnetic characterizations were identified through measurement of magnetic moment by VSM.
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