• Title/Summary/Keyword: 천이금속

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Optimizing the Cobalt Deposition Condition using the Experiment Design

  • Cheong, Seonghwee;Song, Ohsung
    • Proceedings of the Korean Magnestics Society Conference
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    • 2002.12a
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    • pp.184-185
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    • 2002
  • 최신 강자성 메모리 공정과 실리콘 비메모리 공정에서 Co, Ni, Fe 등 천이금속 계열의 증착 조건이 소자의 특성 향상 및 신뢰성 향상을 위하여 중요성이 점점 중요해 지고 있다. 강자성 메모리(MRAM)의 출현과 함께 Co, Ni, Fe 등의 수십 $\AA$ 두께를 전체 기판에 대해 균일하게 증착할 요구가 생겼다. MRAM에 요구되는 자기저항특성은 이러한 박막의 수 $\AA$ 두께 변화에 급격히 변화할 수 있으므로[1,2] 원하는 두께로 균일하게 증착 할 수 있는 기술의 확보가 필요하다[3]. (중략)

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Electrical Conductivity Change of Manganese oxide with Addition of Transition Metal (천이금속 첨가에 따른 이산화망간의 전기전도도 변화)

  • Kim, Bong-Seo;Lee, Dong-Yoon;Lee, Hee-Woong;Chung, Won-Sub
    • Proceedings of the KIEE Conference
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    • 2005.07c
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    • pp.2028-2030
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    • 2005
  • The electrical conductivity of manganese oxide and complex manganese oxide produced by anodic deposition method was measured. The additive transition metal is Cu, Co and Fe. The transition metals like as Cu, Co and Fe improved electrical conductivity of complex manganese oxide compared with manganese oxide. This is coincide with the results of molecular orbital calculation by DV-Xa.

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Corrosion Characteristics and Oxide Microstructure of Zirconium Alloys for Nuclear Fuel Cladding (핵연료피복관용 Zr 합금의 부식특성 및 산화막 미세구조)

  • Jeong, Yong-Hwan;Baek, Jong-Hyeok;Kim, Seon-Jae;Kim, Gyeong-Ho;Choi, Byeong-Gwon;Jung, Yeon-Ho
    • Korean Journal of Materials Research
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    • v.8 no.4
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    • pp.368-374
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    • 1998
  • The corrosion characteristics of zirconium alloys have been investigated in various aqueous solutions of LiOH. NaOH, KOH, RbOH. and CsOH at 3S$0^{\circ}C$. The concentrations of solutions were set to 4.3 mmol and 32.Smmol with equimolar $M^+$ and OH . The oxide characterization was performed using TEM on the samples corroded in 32. Smmol LiOH, NaOH, and KOH solution. The samples were prepared to have the same oxide thickness for the pretransition and post- transition regimes. Considering the trend of experimental data, the cation would playa major role in the corrosion process of Zr alloys in alkali hydroxide solutions. The microstructures of the oxides formed in various solutions were quite different. In LiOH solution the oxides grown in pre-transition as well as post-transition had the equiaxed structures with many pores and open grain boundaries. The oxides grown in NaOH solution had the protective columnar structures in pre-transition and the equiaxed structures with many open grain boundaries in post- transition. On the other hand. in KOH solution the columnar structure was maintained from pre- transition to post- transition. It was considered that the cation incorporation into zirconium oxide controlled the oxide characteristics and the corrosion acceleration in alkali hydroxide solutions.

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Effects of heating rate on the bonded interlayer in base metal powder mixture used transient liquid phase diffusion bonded Ni-base superalloy (모재 분말 혼합 삽입재를 이용한 니켈기 초내열합금의 천이액상확산접합에 있어서 가열속도가 접합부에 미치는 영향)

  • 김성욱;장중철;김재철;이창희
    • Proceedings of the KWS Conference
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    • 2004.05a
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    • pp.48-50
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    • 2004
  • TLP 접합 공정에서 모재와 삽입금속 사이에서의 확산을 통하여 액상 삽입금속은 고온에서 등온으로 유지 시 등온 응고된다. D.S.Duvall은 느린 가열시 매우 빠른 속도로 가열 시 보다 낮은 온도에서 dissolution이 완료되고 응고가 발생할 것으로 예상하였다. (중략)

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