THERMOCHEMICAL REACTIVITY OF DELAFOSSITE-TYPE AGNI0.5TI0.5O2 AND CUNI0.5TI0.5O2 IN O-2 AND H-2

In the layered structure of delafossite-type metal oxides ABO2, the B position can be occupied by a wide spectrum of trivalent or couples of divalent/tetravalent cations. In the A position, however, only monova lent, linearly coordinated cations are accommodated. This study focuse s on the thermochemical reactivity of AgNi0.5Ti0.5O2 and CuNi0.5Ti0.5O 2 in O2 and H-2. The influence of the A cation, i.e. Ag or Cu, on the course of thermally induced processes as well as on the product format ion has been investigated by means of thermal analysis, mass spectrome try and X-ray diffraction. In dependence of the atmosphere, a variety of different solid products can be generated under well controlled con ditions.