| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
The author successfully prepared two series of heteroatom-doped magnetite specimens with compositions Ni(x)Fe(3-x)O(4)(x: 0.0 ~ 0.5) and Mn(x)Fe(3-x)O(4)(x: 0.0 ~ 1.0) (total 14). Changes in interatomic distances, absolute values of atomic displacements and their anisotropy were examined on those specimens with single-crystal X-ray diffractometry and successive structure refinements. As a result, not only an abrupt weakening of cation-anion bonds but also disappearance of a particular lattice vibration mode (dynamic) were observed on heteroatom-doped specimens. By comparing the reported atomic displacements (static) in the low temperature phase and the lattice mode which should be unique on the high temperature phase, the author confirmed that the atomic displacements in the low temperature phase is a “frozen” phonon which is unique in the high temperature, semimetallic phase of magnetite.
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