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Nitridosilicates and oxonitridosilicates have gained significant relevance as host lattices in rare-earth-doped phosphors for LED applications [1]. However, the structural characterization of some of these compounds proved to be difficult due to pronounced real structure effects. In addition to stacking disorder and twinning with domains of various sizes, the pseudosymmetry of parts of the structures gives rise to numerous kinds of intergrowth and antiphase domain structures. For example, the triclinic structure of EuSi2O2N2 (P1, a=7.095 A, b=7.246 A, c=7.256 A, α=88.69°, β=84.77°, γ=75.84°,Z=4, solved from a twinned crystal) consists of nitridosilicate layers different from those in the Ca compound [2] with terminal O atoms forming an almost tetragonal square net. They alternate with pseudohexagonal Eu layers exhibiting pseudotranslational symmetry. Even in apparently ordered samples with minimal diffuse scattering, manifold faults have been detected by HRTEM. The corresponding Sr compound is ’’isotypic’’, however, it shows a much higher tendency not to form ordered crystals and presents interesting kinds of multiple intergrowth. A general approach towards a unified description of the disorder present will be given.

acta crystallographica. section a, foundations of crystallography/acta crystallographica. section a

Crystallochemical analysis of inorganic salts with pyramidal anionsMy(LO3)z(L= S, Se, Te, Cl, Br, I)