Crystallographic parameterisation of distortions in the SOD framework in the sodalite and helvine groups: An analysis in condensed normal modes of an aristotype phase
Abstract:Crystallographic distortions in the alternating aluminium and silicon tetrahedral framework of sodalite (Na 8 Al 6 Si 6 O 24 Cl 2 ), and beryllium and silicon in helvite (Mn 8 Be 6 Si 6 O 24 S 2 ), (framework designated SOD) are described in terms of a set of condensed normal mode amplitudes and phases derived from an ideal tetrahedron of a theoretical aristotype phase. For a sodalite-structured hettotype phase in space group 43Pn , these normal modes transform as the irreducible representations A 1 , E(), T … Show more
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