INCLUSION-COMPOUNDS AS SOURCES OF ACTIVATED MIXED OXIDES

The reactivity of products or intermediates produced by the total or p artial thermal decomposition of Hofmann type and related cyanocomplexe s with general formula [M(B)m]p[M'(CN)4]q . nG (M = Ni, Cu, Zn, Co, Ag ; M' = Ni, Pt; G=C6H6, C6H5OH, H2O; n > 0) are studied. The changes in GC sorptive properties against organic compounds, in the morphology a nd electrical conductivity and capacitance are correlated with the fin al products and different intermediates. Sharp changes of these proper ties occur at characteristic temperatures. The sorptive properties may be observed up to a temperature (t(conv)) at which some changes of pr operties in the compounds start and where stronger changes in morpholo gy and some electrical properties start. The latter became more signif icant at a temperature of about 500-600-degrees-C (t(max)), where oxid es (or metalic Ag form) are already forming. Up to t(conv) the decompo sition process can be regarded as reversible, between t(conv) and t(ma x) as irreversible. The oxides obtained at t(max) exhibit different pr operties than oxides prepared by the normal dehydration of hydroxides.