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Wang","submitted_at":"2011-01-25T17:43:42Z","abstract_excerpt":"With single crystal X-ray diffraction studies, we compare the structures of three sample showing optimal superconductivity, K0.774(4)Fe1.613(2)Se2, K0.738(6)Fe1.631(3)Se2 and Cs0.748(2)Fe1.626(1)Se2. All have an almost identical ordered vacancy structure with a ({\\sqrt}5 x {\\sqrt}5 x 1) super cell. The tetragonal unit cell, space group I4/m, possesses lattice parameters at 250K of a = b = 8.729(2) {\\AA} and c = 14.120(3) {\\AA}, a = b = 8.7186(12) {\\AA} and c = 14.0853(19) {\\AA} and at 295 K, a = b = 8.8617(16) {\\AA} and c = 15.304(3) {\\AA} for the three crystals, respectively. 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