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Theses

Polymorphism of sulfur: Structural and Dynamical Aspects

Abstract : This thesis deals with an investigation of polymorphism in both solid and liquid state of sulphur. Emphasis has been put on the polymer transition of liquid sulphur.

From a short introduction to polymorphism, sulphur appears as a convenient system for these studies. The state of the art of the P T diagram of sulphur is discussed. Then the manuscript describes the high pressures devices and introduces the ESRF used techniques in order to get either structural or dynamical in situ information; namely X ray scattering, Raman scattering and inelastic X ray scattering.

The following part is devoted to the structural results obtained on several sulphur allotropes. Owing to the possibility of in situ measurements with high flux and by using together X-ray and Raman scattering, the structure of equilibrium phases has been determined. Then a new T P phase diagram of sulphur has been obtained.

The last part concerns the dynamical results obtained in the temperature range of the polymerisation transition. Above the transition sulphur behaves as a conventional molecular liquid made of S8 units. At higher temperature it still exhibits S8 molecular motion. However a lower frequency mode shows up. It corresponds to the dynamics of cross linked chain fragments.
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Submitted on : Monday, January 14, 2008 - 12:51:23 AM
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Laura Crapanzano. Polymorphism of sulfur: Structural and Dynamical Aspects. Physics [physics]. Université Joseph-Fourier - Grenoble I, 2006. English. ⟨tel-00204149⟩

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