| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2018: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2017: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Fiscal Year 2016: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
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| Outline of Final Research Achievements |
Dynamic fatigue phenomena of niobium-based lead-free piezoelectric ceramics under harsh conditions mixing of temperature, electrical field, mechanical load, was characterized by using the inverse method incorporating the protocol in finite element analysis, high-power impedance spectroscopy capable of applying electric field over coercive field and soft X-ray spectroscopy capable of analyzing chemical bonding state. In addition to the effect by the grain/domain structure, it was also clarified that the reduction in the Nb-O bonding energy and the resultant ionic polarization contributed to the deterioration of the piezoelectric properties.
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