Abstract
Magnesium doped tantalum oxynitrides were prepared by ammonolysis of amorphous mixed oxides. An orange colored anatase-type phase with the composition Mg 0.05Ta 0.95O 1.15N 0.85 was found. It is metastable and undergoes a phase transformation to a baddeleyite-type phase between 900 and 1000 °C. X-ray diffraction measurements indicate spacegroup I4 1/ amd with lattice parameters a = 391.986 ( 6 ) pm and c = 1011.19 ( 3 ) pm . A possible anion ordering was examined by theoretical methods and neutron diffraction experiments. In addition, anosovite-type (Ti 3O 5) phases Mg x Ta 3− x O 3 x N 5−3 x ; 0⩽ x⩽0.3 were obtained. The electronic spectra of all phases were investigated by UV/vis spectroscopy.
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