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

정미원; 이지윤; 김현정; Miewon Jung; Jiyun Lee; Hyunjung Kim

Korean Chemical Engineering Research, Vol.43, No.1, 71-75, February, 2005

Export Citation

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

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

정미원^†, 이지윤, 김현정

성신여자대학교 화학과, 136-742 서울시 성북구 동선동 3가 249-1

Miewon Jung^†, Jiyun Lee, and Hyunjung Kim

Department of Chemistry, Sungshin Women’s University, 249-1, Dongseon-dong 3-ga, Seongbuk-gu, Seoul 136-742, Korea

E-mail:

초록

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.

Keywords:La0.5Ca0.5MnO3;CP/MAS 13C NMR;TEM;ICP-AES;VSM

[References]

Tokura Y, Tomioka Y, J. Magn. Magn. Mater., 200(1), 1 (1999)
Kwon SW, Park SB, Seo G, Hwang ST, J. Nucl. Mater., 257(2), 172 (1998)
Hervieu M, VanTendeloo G, Caignaert V, Maignan A, Raveau B, Phys. Rev., B, Condens. Matter, 53(21), 14274 (1996)
Kajinara KC, Yao T, J. Sol-Gel Sci. Technol., 16, 257 (1999)
Shimizu Y, Murata T, J. Am. Ceram. Soc., 80(10), 2702 (1997)
Li X, Zhang H, Chi F, Li S, Xu B, Zhao M, Mater. Sci. Eng. B-Solid State Mater. Adv. Technol., 18(3), 209 (1993)
Park HB, Kweon HJ, Kim SJ, Kim K, J. Kor. Chem. Soc., 38(11), 852 (1994)
Jung MW, Lee JY, Kim HJ, J. Kor. Ceram. Soc., 40(5), 434 (2003)
Bilger S, Syskakis E, Naoumidis A, Nickel H, J. Am. Ceram. Soc., 75(4), 964 (1992)
Chen CH, Cheong SW, Phys. Rev. Lett., 76(21), 4042 (1996)
Radaelli PG, Cox DE, Marezio M, Cheong SW, Phys. Rev., B, Condens. Matter, 55(5), 3015 (1997)
Rao CNR, Cheetham AK, Mahesh R, Chem. Mater., 8(10), 2421 (1996)
Mori S, Chen CH, Cheong SW, Phys. Rev. Lett., 81(18), 3972 (1998)

[1] Tokura Y, Tomioka Y, J. Magn. Magn. Mater., 200(1), 1 (1999)

[2] Kwon SW, Park SB, Seo G, Hwang ST, J. Nucl. Mater., 257(2), 172 (1998)

[3] Hervieu M, VanTendeloo G, Caignaert V, Maignan A, Raveau B, Phys. Rev., B, Condens. Matter, 53(21), 14274 (1996)

[4] Kajinara KC, Yao T, J. Sol-Gel Sci. Technol., 16, 257 (1999)

[5] Shimizu Y, Murata T, J. Am. Ceram. Soc., 80(10), 2702 (1997)

[6] Li X, Zhang H, Chi F, Li S, Xu B, Zhao M, Mater. Sci. Eng. B-Solid State Mater. Adv. Technol., 18(3), 209 (1993)

[7] Park HB, Kweon HJ, Kim SJ, Kim K, J. Kor. Chem. Soc., 38(11), 852 (1994)

[8] Jung MW, Lee JY, Kim HJ, J. Kor. Ceram. Soc., 40(5), 434 (2003)

[9] Bilger S, Syskakis E, Naoumidis A, Nickel H, J. Am. Ceram. Soc., 75(4), 964 (1992)

[10] Chen CH, Cheong SW, Phys. Rev. Lett., 76(21), 4042 (1996)

[11] Radaelli PG, Cox DE, Marezio M, Cheong SW, Phys. Rev., B, Condens. Matter, 55(5), 3015 (1997)

[12] Rao CNR, Cheetham AK, Mahesh R, Chem. Mater., 8(10), 2421 (1996)

[13] Mori S, Chen CH, Cheong SW, Phys. Rev. Lett., 81(18), 3972 (1998)