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X-ray diffraction pattern of primetin show a characteristic distribution of sharp reflections and diffuse maxima parallel [unk]*. Following the definition of Wondratschek and Jeitschko (1976) for twin and antiphase domains, this appearance can be interpreted as a polytypic structure, built up of such domains. The sharp reflections alone belong to a monoclinic superposition cell  A ,  B ,  C , with space group  I 2/ a . To include all diffuse spots, the cell must be enlarged by  A , 2 B , 2 C . If the layer group is known, the association of diffuse spots with antiphase and different twin domains is possible in a simple way by subgroup relations.

zeitschrift für kristallographie

Fehlordnung, Polytypie und Struktur von Primetin: 5,8-Dihydroxy-2-phenyl-chromen-4-on Die Anwendung von Untergruppenbeziehungen bei der Strukturbestimmung