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The RTxX2 (x ≤ 1) type metallic compounds where R is a rare-earth element, T is a d-electron element and X is a p-electron element (X = Si, Ge, Sn) crystallize in different orthorhombic crystal structures but most of them crystallize in orthorhombic CeNiSi2 - type (space group Cmcm). The silicides form stoichiometric compounds while the majority of germanides and stannides non stoichiometric ones...
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