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flexions are also visible on X-ray photographs using longer exposure times. Together with these chanqes there appears a stroNq increase of the dl ffuse background in the pow.der diagrams showing a characteristic modulation, . which can be connected with overdamped soft modes at the·l'-point and in (~\ 0) -directions observed by inelastic neutron scattering (Boysen,Eckold, Symp. on Neutron Scattering, Berlin, 1984). En conclusion the transition is characterized by a rotational rearrangement of (nearly) rigid (Si,Al)04-tetrahedra combined

Coexistence of tridymite polymorphs and cristobalite in tridymite crystals