Ein Calciumurannitrid — (Ca3U)N4 — mit Natriumchloridstruktur

Mixtures of calcium amide, Ca(NH₂)₂ and uranium hydride, UH₃ were reacted at temperatures between 600 °C and 1000 °C for 2d to 30d. Starting with a mixture 3 : 1 a singlephase, black, microcrystalline product is obtained. As a result of X‐ray and neutron diffraction the phase has the composition (Ca_{0, 75}U_{0, 25})N = Ca₃UN₄. It crystallizes in the space group Fm3¯m with a = 4.9398 (1) Å in the sodium chloride structure type with statistical occupation of the cation site 4a by 3Ca and 1U.     

TlCu(OH)CO3 — Ein neues basisches Thallium-Kupfer-Carbonat

TlCu(OH)CO₃ — a New Basic Thallium Copper Carbonate TlCu(OH)CO₃ was prepared from carbonate solutions. Its crystal structure was determined (hexagonal, P6₃/m (Nr. 176), a = 1084.9(1), b = 611.8(1) pm, V_EZ = 623.6(1) X 10⁶ pm³, Z = 6, R = 0.036, Rw = 0.020). Structural features are Cu? O chains bridged by carbonate groups and tunnels parallel [0 0 1]. The thermal behaviour of the new carbonat was examined with TG/DTA- and Simon-Guinier-techniques. The decomposition occurs in two steps to the products Tl₂O and CuO. Magnetic measurements show Curie-paramagnetism with θ_Curie = 2.7 K. A ferromagnetic arrangement of the Cu²⁺-moments was detected below 4.8 K. An IR-spectrometric characterisation in comparision with other copper-carbonato complexes will be discussed.