2015 Fiscal Year Final Research Report
Investigation of the exotic properties originated from a large tetragonal distrotion
| Project/Area Number |
26800180
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | Chuo University |
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Principal Investigator |
Oka Kengo 中央大学, 理工学部, 助教 (80602044)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Keywords | 精密構造解析 / 放射光粉末X線回折 / リートベルト解析 / 酸フッ化物 |
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| Outline of Final Research Achievements |
New oxyfluoride system which contains Pb and Ti was invesitigated based on the tetragonal perovskite PbTiO3. Our study found novel oxyfluorides, Pb2Ti4O9F2とPb2Ti2O5.4F1.2. Bond valence sum calculations and determining electron density distribution by the maximum entropy method reveled presence of O/F anion order in Pb2Ti4O9F2. Pb2Ti2O5.4F1.2 was a pyrochlore with centrosymmetric space group, however, exhibited an unusual large dielectric constant. Presence of local distortion may be the origin of the high dielectric constant.
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| Free Research Field |
固体化学
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