| Budget Amount *help |
¥25,350,000 (Direct Cost: ¥19,500,000、Indirect Cost: ¥5,850,000)
Fiscal Year 2021: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2019: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2018: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2017: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
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| Outline of Final Research Achievements |
The purpose of this research is to develop solid-state cooling technology that can be used for next-generation cooling equipment. We utilized the interaction between defect dipoles with Cu ion-oxygen vacancy and the spontaneous polarization of ferroelectric barium titanate to control the polarization reversal. The electrocaloric effect in the single-domain state was not significantly different from the pristine sample without polarization reversal, and no temperature change was confirmed. In the multi-domain state, we obtained the world's highest figure of merit measured at room temperature due to de-insertion of ferroelastic domain walls. We have demonstrated that materials design utilizing an interaction between defect dipoles and ferroelectric polarization is effective for enhancing the electrocaloric effect.
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