2012 Fiscal Year Final Research Report
two-phase state of crystallite and grain boundary in nanocrystalline gold stabilized by vacancy-type defects with compositional concentration
| Project/Area Number |
22560656
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical properties of metals
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| Research Institution | University of Tsukuba |
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Principal Investigator |
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| Project Period (FY) |
2010 – 2012
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| Keywords | ナノ物性 |
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| Research Abstract |
We found that nanocrystalline gold (ultrafine polycrystalline with the mean grain size below a few tens nm, n-Au, hereafter) shows characteristic behaviors. We have proposed that a two-phase state with crystallite phase and surrounding grain boundary phase are in quasi-equilibrium. From the anelastic measurement, an increase in grain boundary anelasticity was found at around 200 K. The x-ray diffraction measurement showed that the lattice constant at room temperature was smaller by about 0.05% from that of the conventional polycrystalline gold (poly-Au) and the temperature change of the lattice constant became slightly moderate at around 200 K. These propertie s were recovered to those of poly-Au after grain growth by annealing. It is indicated that the state of the grain boundaries of n-Au is different from that of poly-Au and the lattice contraction play an important role on the quasi-equilibrium of two-phase state.
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[Journal Article] Pattern-independent, fine-morphology Ni-Pt silicide formation by partial conversion with low metal-consumption ratio2010
Author(s)
Futase, T., Kamino, T., Hashikawa, N., Inaba, Y., Fujiwara, T., Yamamoto, H. and Tanimoto, H.
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Journal Title
Anaheim, CA
Pages: 988-994
DOI
Peer Reviewed
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