Four-Dimensional Modeling of Two Ternary Columnar Composite Compounds
Two ternary columnar composite crystals, Ba15Zr14Se42 and Sr21Ti19Se57, have been characterized and modeled three-dimensionally [1] and they are stated to have a commensurate crystal structure similar to several incommensurate ternary sulfur compounds [2]–[6]. To evaluate whether the two columnar compounds are isostructural to the sulfur compounds they need to be modelled four-dimensionally.