• Title/Summary/Keyword: $LaMnO_3$

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The Influence of Ferromagnetic $BaFe_{12}O_{19}$ Layer for Low-Field Tunnel-Type Magnetoresistance on $La_{2/3}Sr_{1/3}MnO_3/BaFe_{12}O_{19}/SiO_2/Si(001)$ Granular-Type Multilayer Thin Films ($La_{2/3}Sr_{1/3}MnO_3/BaFe_{12}O_{19}/SiO_2/Si(001)$ 입상형 다층박막 구조에서 강자성 $BaFe_{12}O_{19}$ 중간층이 저 자장 터널형 자기저항 특성에 미치는 영향)

  • 심인보;안성용;이희민;유홍주;김철성;최세영
    • Proceedings of the Korean Magnestics Society Conference
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    • 2001.10a
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    • pp.48-49
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    • 2001

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Crystal Growth of $RE_{1-x}Ca_xMnO_3$(RE=La, Nd) by Floating Zone Method (부유대역용융법에 의한 $RE_{1-x}Ca_xMnO_3$ (RE=La, Nd)의 결정성장)

  • 정준기;조남희;김철진;이태근
    • Korean Journal of Crystallography
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    • v.11 no.4
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    • pp.231-237
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    • 2000

  • CMR Materials RE/sub 1-x/Ca/sub x/MnO₃(RE=La, Nd, A=Ca, Sr) were grown using the floating zone image furnace with halogen lamps as heat source. The growth condition was at 2∼10 mm/hr growth rate in air atmosphere, were 445∼50 rpm and 20∼25 rpm of rotation rate of feedrod and growing crystal, respectively. The grown crystals showed shiny black color and annealed at 1500℃ in a box furnace to release the residual stress during cooling. Characterization analyses of the crystal were carried out using XRD and SEM. The crystal structure of Nd/sub 0.7/Ca/sub 0.3/MnO₃ was analyzed with smart CCD XRD was lattice parameter of a=5.425(4)Å, b=5.434(4)Å, and c=7.712(5)Å, an orthorombic system with space group of pbnm.

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Fabrication and characteristics of La1-xSrxMO3(M = Fe, Co, Mn) formaldehyde gas sensors (La1-xSrxMO3(M = Fe, Co, Mn) 물질을 이용한 포름알데히드 가스센서의 제조와 특성)

  • Kim, H.J.;Choi, J.B.;Kim, S.D.;Yoo, K.S.
    • Journal of Sensor Science and Technology
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    • v.17 no.3
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    • pp.203-209
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    • 2008

  • Thick film formaldehyde (HCHO) gas sensors were fabricated by using $La_1_{-x}Sr_xMO_3$ (M= Fe, Co, Mn) ceramics. The powders of $La_1_{-x}Sr_xMO_3$ (M=Fe, Co, Mn) were synthesized by conventional solid-state reaction method. By using the $La_1_{-x}Sr_xMO_3$ (M=Fe, Co, Mn) paste, the thick-film formaldehyde sensors were prepared on the alumina substrate by silkscreen printing method. The experimental results revealed that $La_1_{-x}Sr_xMO_3$ (M= Fe, Co, Mn) ceramic powder has a perovskite structure and the thick-film sensor shows excellent gas-sensing characteristics to formaldehyde gas (sensitivity of $La_{0.8}Sr_{0.2}FeO_3$, S= 14.7 at operating temperature of $150^{\circ}C$ in 50 ppm HCHO ambient).

  • https://doi.org/10.5369/JSST.2008.17.3.203 인용 PDF KSCI