Abstract
The crystal structure of apatite Sr5(CrO4)3(Cu0.586O) was solved using X-ray diffraction data with GSAS program in the space group P63/m with hexagonal unit cell parameters: a=10.0292(1), c=7.4623(1)Å, V=650.033(8) Å3, and Z=2. This compound is stable up to 1473K in air. It was found that copper in the form of Cu+ cations is located in infinite linear (CuO)−1 chains inserted into the tunnels parallel to the hexagonal c axis. The chains contain about 40% vacancies in copper positions. The experimental value of the effective magnetic moment (μeff) for the 1Cr atom in formula Sr5(CrO4)3(Cu0.586(4)O) (1.671μB) is slightly smaller than the theoretical moment (1.732μB) calculated in the assumption that all chromium is present as Cr5+ cations and copper as Cu+.
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