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X-ray study of the modulation-wave structure in thiourea

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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
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)

Submitter: 塩崎 洋一

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