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The Mn 2 SnSe 4  compound was synthesized by the melt and annealing technique and its structure was refined by the Rietveld method using X-ray powder diffraction data. This compound crystallizes in the olivine-type structure with unit cell parameters  a  = 12.9028(2) A,  b  = 7.9001(1) A,  c  = 6.5015(1) A, V = 662.72(2) A 3  in the orthorhombic space group  Pnma  (No 62). This olivine structure can be described from a hexagonal close-packing of selenium atoms where manganese atoms occupy ½ of the octahedral sites while thin atoms lay in ⅛ of the tetrahedra.

Synthesis and crystal structure determination of the new olivine-type compound Mn2SnSe4