| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Outline of Final Research Achievements |
The goal of this study is development of the first-principles multiscale and multi-nonlinear analysis method for novel lead-free materials to generate giant piezoelectric property. It is a salient feature that there is a coexistence region of some different crystal phases such as tetragonal and rhombohedral phases, which is morphotropic phase boundary (MPB). Multiple-phase materials at MPB is easy to pole and exhibits superior piezoelectric performance by domain switching and structural phase transition. The first-principles calculation was employed for determination of coexistent crystal phases, characterization of crystal structure and criterion of crystal transition. The asymptotic homogenization theory was utilized for scale bridging between microstructural morphology changes and macrostructural nonlinear behaviors. The developed method can play a leading role in discovery of novel materials.
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