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X-ray study of the modulation-wave structure in thiourea
| Title: | X-ray study of the modulation-wave structure in thiourea |
| Authors: | Takahashi, Isao Browse this author | | Onodera, Akira Browse this author | | Shiozaki, Yoichi Browse this author |
| Issue Date: | 1-Nov-1987 |
| Publisher: | American Physical Society |
| Journal Title: | Physical Review B |
| Volume: | 36 |
| Issue: | 13 |
| Start Page: | 7008 |
| End Page: | 7012 |
| Publisher DOI: | 10.1103/PhysRevB.36.7008 |
| Abstract: | A longitudinal component of the modulated structure of thiourea SC(NH2)2 which corresponds to the translational mode transformed under the irreducible representation B3g in D2h has been observed by x-ray diffraction. The parameters including the longitudinal component are examined. The longitudinal component accounts well for the asymmetry of pairs of the satellite intensities (hkl±δ). The phase of the longitudinal wave differs by π/2 from those of the transverse waves of B2u symmetry, which corresponds to the ferroelectric soft mode. The amplitude of the longitudinal wave is as small as 10-1 times those of the transverse waves. A possible interpretation on the longitudinal mode is given by considering the short-range interaction between molecules: It suggests that the longitudinal component, as well as the transverse components, plays an important role in the occurrence of the incommensurate phase of thiourea. |
| Rights: | © 1987 The American Physical Society |
| Type: | article |
| URI: | http://hdl.handle.net/2115/56812 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 塩崎 洋一
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