| Budget Amount *help |
¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2011: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2010: ¥12,220,000 (Direct Cost: ¥9,400,000、Indirect Cost: ¥2,820,000)
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| Research Abstract |
In this study, we focus on the effects of quantum fluctuation on the coupling effects of electric dipoles in ferroelectrics. We found that there is a huge response of physical properties such as the dielectric and piezoelectric constants around the quantum phase transition of the Ba_1-xCa_xTiO_3 system. We also show that the influences of quantum effects are not limited to merely the temperatures close to 0 K, but can cover a large temperature range of ~100 K. We further show that Ba_1-xCa_xTiO_3(x=0.233) having a quantum phase transition has an extremely stable temperature dependence of dielectric and electromechanical responses in a large temperature range of 0 K~370 K, which may be interesting for the applications of the capacitive and piezoelectric devices working for a wide temperature range.
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