COMMENTS ON THE ICE Ic STRUCTURE AND Ic TO Ih PHASE TRANSFORMATION MECHANISM : A NEUTRON SCATTERING INVESTIGATION OF ICE PRECIPITATES IN GLASSY LiCl.D2O

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Abstract
Intermediate steps of the ice Ic → Ih Transformation have been observed by neutron scattering in the ice crystallites precipitated from a glassy LiCl.D2O matrix. An accurate description of the observed scattering patterns has been obtained by introducing Warren peak profiles such as obtained by bidimensional structures. This, as well as the progressive appearance of the 10l (Ih) series of lines, could be explained by the formation of ice Ih sheets (such as obtained from stacking faults in ice Ic) and progressive piling up of these sheets until completion of the Ih structure. This might also explain the distortions of the (Ic) 111 peak. Comments are given on a possible low density amorphous ice coexisting with the Ic → Ih transformation

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