| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Outline of Final Research Achievements |
Negative thermal expansion (NTE) compounds show volumetric contraction with increasing temperature. It has been expected to apply the NTE compounds for a variety of applications. However, a function of the NTE compounds reported previously has been limited to just NTE property. In this investigation, a development of functional NTE compounds has been carried out. Zirconium tungstate, ZrW2O8, is one of the NTE compounds. In order to add conductivity to ZrW2O8, Zr1-xScxW2O8-y solid solutions were synthesized. It is successful that the solid stations have ionic conductivity of oxygen atom via defect generated by the doping of trivalent cations. The mechanism of the ionic conductivity is clarified.
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