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The phase diagram of thiourea as a function of temperature and hydrostatic pressure is investigated by means of neutron diffraction. Accurate satellite-position measurements reveal the existence of commensurate phases corresponding to the rational values 1/3, 1/7, and 1/9 for the modulation wave vector. The results are discussed qualitatively in terms of ordinary Landau theory and in the light of Aubry's "devil's-staircase" approach.
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Dénoyer et al. (1982) studied this question.
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