New ternary arsenides ET2AS2 (E = Ca, Sr, Ba; T = Cr, Fe, Co, Ni, Cu) were prepared. The cell data were determined by X-ray powder methods. All these compounds crystallize in the tetragonal ThCr2Si2 structure (I 4/mmm), which consists of layers of edge-shared TAS4 tetrahedra. The alkaline-earth atoms are intercalated between the layers.
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Pfisterer et al. (1980) studied this question.
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