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首頁> 外文學(xué)位 >Combinatorial investigation of intermetallics using electron-beam deposition.
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Combinatorial investigation of intermetallics using electron-beam deposition.

機譯：使用電子束沉積對金屬間化合物進行組合研究。

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摘要

We have systematically studied subtle changes in physical properties of intermetallics using the combinatorial strategy where a large number of samples with systematically changed parameters can be rapidly studied. We have developed a new combinatorial electron-beam (e-beam) deposition chamber which allows us to perform layer-by-layer deposition as well as co-deposition. For my thesis, two particular topics of significant technological impacts involving intermetallic systems were investigated. They are exchange-coupled soft/hard magnetic bilayer systems and hydrogen storage Mg--(transiton metal) (TM) binary systems. The first topic is discussed in Chapter 2 -- Chapter 4, and the second topic is duscussed in Chapter 5 -- Chapter 7. Summary of the thesis work and future plans are discussed in Chapter 8.;We have studied the effect of magnetic parameters of the soft layer on the exchange coupling behavior of soft/hard magnetic bilayer systems. The magnetic parameters of the soft layer were systematically changed in a combinatorial manner by changing the composition of the soft layer. The exchange coupling behavior was monitored by M-H hysteresis loops taken by a magneto-optical Kerr effect (MOKE) measurement set up. The MOKE M-H hysteresis loops successfully delineated the exchange coupling behavior dependence on the magnetic parameters.;We have also studied the effect of the crystallinity and grain-texturing of the hard layer on the exchange coupling behavior of hard/soft magnetic bilayer systems. The crystallinity and the degree of grain-texturing were controlled by growth temperature and the post-annealing process of the hard layer. The MOKE M-H hysteresis loops successfully revealed that attaining a single phase, single orientation hard layer is the key to achieving a good exchange coupling behavior.;We have developed a new infrared (IR) imaging set up to perform high-throughput screening of hydrogen storage properties of Mg-TM systems. In order to demonstrate the utility of the set up, we studied promising Mg-TM binary systems. We have fabricated Mg-TM binary composition spread thin films using the combinatorial e-beam chamber. For each composition, IR intensity as a function of measurement time were monitored by analyzing images collected continuously and periodically during measurements. The change in IR intensity curves successfully gave systematic trends in hydrogen absorption/desorption properties of Mg-TM composition spread thin films.;We have established a novel way to use an IR imaging and succeeded to measure propagation of hydride formation from the top of hydrogen storage thin film. IR images of thickness gradient Mg0.95Ti0.05 thin films enabled us to directly determine the propagation of the hydride formation front quantitatively.
機譯：我們已經(jīng)使用組合策略系統(tǒng)研究了金屬間化合物的物理性質(zhì)的細微變化，在該策略中，可以快速研究大量具有系統(tǒng)變化參數(shù)的樣品。我們已經(jīng)開發(fā)了一種新的組合電子束（e-beam）沉積室，它使我們能夠進行逐層沉積以及共沉積。在我的論文中，研究了涉及金屬間體系的重大技術(shù)影響的兩個特定主題。它們是交換耦合的軟/硬磁雙層系統(tǒng)和儲氫Mg-（過渡金屬）（TM）二元系統(tǒng)。第一個主題在第二章至第四章中討論，第二個主題在第五章至第七章中討論。第八章討論論文工作和未來計劃的總結(jié)；我們研究了磁參數(shù)的影響軟層對軟/硬磁性雙層系統(tǒng)交換耦合行為的影響。通過改變軟層的組成，以組合方式系統(tǒng)地改變了軟層的磁參數(shù)。通過磁光克爾效應(yīng)（MOKE）測量裝置拍攝的M-H磁滯回線來監(jiān)控交換耦合行為。 MOKE M-H磁滯回線成功地描述了交換耦合行為對磁參數(shù)的依賴性。;我們還研究了硬層的結(jié)晶度和晶?？棙?gòu)對硬/軟磁雙層體系交換耦合行為的影響。結(jié)晶度和晶粒組織化程度由生長溫度和硬質(zhì)層的后退火工藝控制。 MOKE MH磁滯回線成功地揭示了獲得單相，單向硬層是實現(xiàn)良好的交換耦合行為的關(guān)鍵。我們已經(jīng)開發(fā)出一種新的紅外（IR）成像裝置，可以對氫存儲進行高通量篩選Mg-TM系統(tǒng)的特性。為了演示該設(shè)置的實用性，我們研究了有前途的Mg-TM二進制系統(tǒng)。我們已經(jīng)使用組合電子束腔室制作了Mg-TM二元組成的分散薄膜。對于每種組合物，通過分析在測量過程中連續(xù)和定期收集的圖像，可以監(jiān)視作為測量時間函數(shù)的IR強度。 IR強度曲線的變化成功地給出了Mg-TM成分擴散薄膜的氫吸收/解吸特性的系統(tǒng)趨勢。;我們建立了一種使用IR成像的新方法，并成功地測量了氫從氫頂部形成的氫化物的擴散儲存薄膜。厚度梯度為Mg0.95Ti0.05薄膜的紅外圖像使我們能夠直接直接確定氫化物形成前沿的擴散。

著錄項

  • 作者

    Oguchi, Hiroyuki.;

  • 作者單位

    University of Maryland, College Park.;

  • 授予單位 University of Maryland, College Park.;
  • 學(xué)科 Engineering Materials Science.
  • 學(xué)位 Ph.D.
  • 年度 2008
  • 頁碼 172 p.
  • 總頁數(shù) 172
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類 工程材料學(xué);
  • 關(guān)鍵詞

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