| Budget Amount *help |
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2012: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2011: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2010: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
|
|---|
| Research Abstract |
Phase transitions and associated changes in physical properties of the alkaline niobate ferroelectric single-crystals, have been investigated from a structural point of view. A high-precision single-crystal X-ray diffraction study at elevated temperatures revealed a systematic change in the coordination number of niobium atoms and the spontaneous polarization. The anharmonic atomic displacement parameters of the paraelectric cubic phase were determined from the Gram-Charlier expansion series, in order to obtain the joint-probability density function and the one-particle potential. These analyses revealed a presence of strong one-dimensional correlation of O atoms along the -O-Nb-O-Nb- chain, suggesting possible nucleation and growth of small tetragonal ferroelectric domains in the paraelectric matrix of the cubic phase just above the phase transition point. Structural studies were also carried out on the related compounds.
|
