Abstract
By reaction of Tl2O3 and Cu2O in a sealed copper-type TlCu[CuO2] was
synthesized; the orthorhombically bodycentered crystallizing compound
forms a new structure type, space group Imma (no. 74), with the lattice
constants a = 552.5 pm, b = 605.2 pm, c = 896.4 pm. The Madelung Part
of Lattice Energy, MAPLE, as well as Effective Coordination Numbers,
ECoN, these via Mean Effective Ionic Radii, MEFIR, were calculated.
