| Budget Amount *help |
¥46,410,000 (Direct Cost: ¥35,700,000、Indirect Cost: ¥10,710,000)
Fiscal Year 2010: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2009: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Fiscal Year 2008: ¥14,040,000 (Direct Cost: ¥10,800,000、Indirect Cost: ¥3,240,000)
Fiscal Year 2007: ¥19,760,000 (Direct Cost: ¥15,200,000、Indirect Cost: ¥4,560,000)
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| Research Abstract |
An enhancement of the conductivity of the defect-type proton conducting oxide by the super saturation of acceptor dopant can be expected because the proton is incorporated in order to compensate the lack of positive charge induced by the acceptor doping. In the present research, the following three methods of super saturation of dopant were examined to the alpha alumina-base oxide system : (1) freezing of the high-temperature equilibrium state with the second phase containing the acceptor element, (2) forced reduction of trivalent transition element deeply doped into the bulk, and (3) low-temperature sintering of amorphous alumina powder containing a large amount of dopant synthesized at low temperature reaction. In the first method, it was confirmed that the material with the higher proton conductivity could be obtained and that the effect was accelerated by controlling the atmosphere at the equilibration state. In the second method, it was found that the selection of the dopant element is critical to realize the increase of the proton conductivity. The third method was ascertained effective if the proper method of sintering was employed.
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