Korean Chemical Engineering Research

  • 제43권1호
  • /
  • Pages.71-75
  • /
  • 2005
  • /
  • 0304-128X(pISSN)
  • /
  • 2233-9558(eISSN)
한국화학공학회 (The Korean Institute of Chemical Engineers)
권호 표지

La0.5Ca0.5MnO3 분말과 Pellet의 구조분석 및 자기적 성질

Structural Elucidation and Magnetical Properties of La0.5Ca0.5MnO3 Powders and Pellets

  • Jung, Miewon (Department of Chemistry, Sungshin Women's University) ;
  • Lee, Jiyun (Department of Chemistry, Sungshin Women's University) ;
  • Kim, Hyunjung (Department of Chemistry, Sungshin Women's University)
  • 투고 : 2004.02.04
  • 심사 : 2004.10.15
  • 발행 : 2005.02.28
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

초거대 자기 저항 물질인 $La_{0.5}Ca_{0.5}MnO_3$의 분말과 pellet을 졸-겔 법으로 제조하였다. 열처리 온도를 변화시켜 얻은 시료에 대해 FT-IR과 CP/MAS $^{13}C$ 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($T_c$)는 236 K에서 측정되었다.

$La_{0.5}Ca_{0.5}MnO_3$ colossal magnetoresistance (CMR) powders and pellets were synthesized by sol-gel process. The structural changes were investigated by FT-IR, CP/MAS $^{13}C$ solid state NMR spectroscopy and XRD. The particle characterization, microstructure of sintered samples, and cation composition of gel powders were studied by FE-SEM/EDS, TEM and ICP-AES. The structure refinement reveals that $La_{0.5}Ca_{0.5}MnO_3$ has orthorhombic, perovskite type unit cell. The magnetic characterizations were identified through measurement of magnetic moment by VSM.

키워드

참고문헌

  1. Tokura, Y. and Tomioka, Y., 'Colossal Magnetoresistive Manganites,' J. Magn. Magn. Mater., 200(1), 1-23(1999) https://doi.org/10.1016/S0304-8853(99)00352-2
  2. Kwon, S. W., Park, S. B., Seo, G. and Hwang, S. T., 'Preparation of Lithium Aluminate via Polymeric Precursor Routes,' J. Nuclear Materials., 257(2), 172-179(1998) https://doi.org/10.1016/S0022-3115(98)00442-5
  3. Hervieu, M., Van Tendeloo, G., Caignaert, V., Maignan, A. and Raveau, B., 'Monoclinic Microdomains and Clustering in the Colossal Magnettoresistance Manganites $Pr_{0.7}Ca_{0.25}Sr_{0.05}MnO_3\;and\; Pr_{0.75}Sr_{0.25}MnO_3$,' Phys. Rev. B: Condens. Matter., 53(21), 14274-14284(1996) https://doi.org/10.1103/PhysRevB.53.14274
  4. Kajinara, K. C. and Yao, T., 'Macroporous Morphology of the Titania Films Prepared by a Sol-Gel Dip-Coating Method from the System Containing Poly (Ethylene Glycol). III. Effect of Chemical Additives,' J. Sol-Gel Sci. and Tech., 16, 257-266(1999) https://doi.org/10.1023/A:1008721320860
  5. Shimizu, Y. and Murata, T., 'Sol-Gel Synthesis of Perovskite Type Lanthanum Manganite Thin Films and Fine Powders using Metal Acetylacetonate and Poly(vinyl alcohol),' J. Am. Ceram. Soc., 80(10), 2702-2704(1997) https://doi.org/10.1111/j.1151-2916.1997.tb03178.x
  6. Li, X., Zhang, H., Chi, F., Li, S., Xu, B. and Zhao, M., 'Synthesis of Nanocrystalline Composite Oxides $La_{1-x}Sr_xFe_{1-y}Co_yO_3$ with the Perovskite Structure using Poly (ethylene glycol) Gel Method,' Mater. Sci and Eng. B., 18(3), 209-213(1993) https://doi.org/10.1016/0921-5107(93)90133-8
  7. Park, H. B., Kweon, H. J., Kim, S. J. and Kim, K., 'Preparation of $LaMO_3$ (M: Cr, Mn, Co) Fine Powders using PEG,' J. Kor. Chem. Soc., 38(11), 852-855(1994)
  8. Jung, M. W., Lee, J. Y. and Kim, H. J., 'Preparation and Characterization of $La_{0.8}Ca_{0.2}MnO_3$,' J. Kor. Ceram. Soc., 40(5), 434-440(2003) https://doi.org/10.4191/KCERS.2003.40.5.434
  9. Bilger, S., Syskakis, E., Naoumidis, A. and Nickel, H., 'Sol-Gel Synthesis of Strontium-Doped Lanthanum Managanite,' J. Am. Ceram. Soc., 75(4), 964-970(1992) https://doi.org/10.1111/j.1151-2916.1992.tb04167.x
  10. Chen, C. H. and Cheong, S-W., 'Commensurate to Incommensurate Charge Ordering and its Real-Space Images in $La_{0.5}Ca_{0.5}MnO_3$', Phys. Rev. Lett., 76(21), 4042-4045(1996) https://doi.org/10.1103/PhysRevLett.76.4042
  11. Radaelli, P. G., Cox, D. E., Marezio, M. and Cheong, S.-W., 'Charge, Orbital, and Magnetic Ordering in $La_{0.5}Ca_{0.5}MnO_3$', Phys. Rev. B., 55(5), 3015-3023(1997) https://doi.org/10.1103/PhysRevB.55.3015
  12. Rao, C. N. R., Cheetham, A. K. and Mahesh, R., 'Giant Magnetoresistance and Related Properties of Rare-Earth Manganates and Other Oxide Systems,' Chem. Mater., 8(10), 2421-2432(1996) https://doi.org/10.1021/cm960201v
  13. Mori, S., Chen, C. H. and Cheong, S-W., 'Paired and Unpaired Charge Stripes in the Ferromagnetic Phase of $La_{0.5}Ca_{0.5}MnO_3$,' Phys. Rev. Lett., 81(18), 3972-3975(1998) https://doi.org/10.1103/PhysRevLett.81.3972