two-phase state of crystallite and grain boundary in nanocrystalline gold stabilized by vacancy-type defects with compositional concentration
| Project/Area Number |
22560656
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Physical properties of metals
|
|---|
| Research Institution | University of Tsukuba |
|---|
Principal Investigator |
|
|---|
| Project Period (FY) |
2010 – 2012
|
| Project Status |
Completed (Fiscal Year 2012)
|
| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2010: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
|
|---|
| Keywords | ナノ物性 / ナノ材料 / 金属物性 / 超微細多結晶組織 / 結晶粒界 / 原子空孔 / 格子定数 / 力学特性 / 格子欠陥 / ナノ結晶 |
|---|
| 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.
|
Report
(4 results)
Research Products
(45 results)
-
-
-
-
-
-
-
-
-
-
-
-
[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.
-
Journal Title
Anaheim, CA
Pages: 988-994
DOI
Related Report
Peer Reviewed
-
[Journal Article] Magnetic anisotropy in Fe nanocrystals fabricated by GDM2010
Author(s)
Kita, E., Sato, H., Tsukahara, N., Lee, S.J., Yanagihara, H., Tanimoto, H.
-
Journal Title
Journal of Physics : Conference Series
Volume: 200
Related Report
Peer Reviewed
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
