| La0.8Ca0.2MnO3의 합성 및 특성연구 |
| 정미원, 이지윤, 김현정 |
| 성신여자대학교 화학과 |
| Preparation and Characterization of La0.8Ca0.2MnO3 |
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| ABSTRACT |
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The powders of L $a_{0.8}$C $a_{0.2}$Mn $O_3$ Colossal Magnetoresistance (CMR) materials were synthesized by sol-gel process. Lanthanum(H), Calcium(II) and Manganese(III) 2,4-Pentanedionate were dissolved in a mixed binary solution consisted of propionic acid and methanol with PEG (15 wt%) aqueous solution. The progress of reactions was monitored by FT-IR spectroscopy. The Lao scao.2Mn03 gel powders were annealed at various temperatures. The structural changes were investigated by FT-IR, CP/MAS $^{ 13}$C solid state NMR spectroscopy and XRD. The thermochemical property, particle characterization, microstructure of sintered sample, and cation composition of gel powder were studied by TG/DTA, FE-SEM and ICP-AES. The magnetic characterizations were identified through measurement of magnetic moment by VSM.M. |
| Key words:
${La_{0.8}}{Ca_{0.2}}{MnO_3}$, FT-IR, $CP/MAS ^{13}$C NMR, ICP-AES, VSM |
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