| Project/Area Number |
60850031
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
機械要素
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| Research Institution | Osaka University |
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Principal Investigator |
UMENO Masataka Osaka University, Faculty of Engineering, 工学部, 教授 (50029071)
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| Co-Investigator(Kenkyū-buntansha) |
田畑 則一 三菱電機KK, 応用機器研究所, 部長
KOSHIKAWA Takanori Osaka Electrocommunication University, Faculty of Engineering, 工学部, 教授 (60098085)
OHMAE Nobuo Osaka University, Faculty of Engineering, 工学部, 助手 (60029345)
TABATA Norikazu Mitsubishi Electric Corporation, Product Development Laboratory
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1986: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1985: ¥4,000,000 (Direct Cost: ¥4,000,000)
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| Keywords | Surface / Interface / Substrate / Atomic Structure / 高電圧電界イオン顕微鏡 / 電界イオン顕微鏡 / 高電圧印加方式 |
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| Research Abstract |
A high voltage field ion microscope (HV-FIM) has been developed for technological advances of observing atomic structures of surface, interface, and substrate of materials. As is well known, the applications of field io <eta> microscopy have been limited to fine refractory metal wires primarily due to the requirement of a high electric field of 10GV/m. One would require the design of a high voltage vacuum feedthrough in order to observe atomic arrangements of tip-specimen with a large radius of curvature. Main components of the present HV-FIM are ultra-high vacuum chamber of <10^(-7)> Pa, liquid <N_2> cooled cold finger, and the high voltage devices with a maximum voltage of 60kV. An equipment of the specimen exchange chamber enabled efficient observations of a specimen without leaking the whole vacuum system to an ordinary atmosphere.
HV-FIM observations boron-coated tungsten were carried out. By heating the coated specimen at 1200 K, the formation of <W_2B_5> was identified, and this coincides with the existence of tungsten borides at the core of boron fibers. An observation of the atomic structure of bulk tungsten, instead of fine tungsten wire, was successfully made using the HV-FIM, and He-ion image of W-atoms was obtained with a high resolution of 0.4nm. The above results obtained from the tip having a large radius of curvature may not be possible without a use of HV-FIM.
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