Hydrothermal Synthesis of Delafossite-Type Oxides

The syntheses of copper and silver delafossite-type oxides from their constituent binary metal oxides, oxide hydroxides and hydroxides, by low temperature (<210 °C) and low pressure (<20 atm) hydrothermal reactions are described. Particular emphasis is placed on how the acid-base character of a constituent oxide determines its solubility and therefore whether a particular delafossite-type oxide can be synthesized, a strategy utilized by geologists and mineralogists to understand the conditions necessary for the synthesis of various minerals. Thus, the geochemical and corrosion science literature are shown to be useful in understanding the reaction conditions required for the syntheses of delafossite-type oxides and the relationship between reactant metal oxide acid-base character, solubility, aqueous speciation, and product formation. Manipulation of the key parameters, temperature, pressure, pH, and reactant solubility, results in broad families of phase-pure delafossite-type oxides in moderate to high yields for copper, CuBO2 (B) Al, Sc, Cr, Mn, Fe, Co, Ga, and Rh), and silver, AgBO2 (B ) Al, Sc, Fe, Co, Ni, Ga, Rh, In, and Tl)

European Integration - Czech Society and Landscape

Top meeting of Czech geographers provided a space for exchange of a knowledge and informations from physical geography and geoecology, social geography and regional development, regional geography, educational geography and cartography and geoinformatics. The CD-ROM includes both each of taken articles, and two mono - thematic numbers of journal Geography, and supporting congress activities

Metoda hodnocení environmentálního stresu a její aplikace v podmínkách Severozápadních Sudet

The results of research follow from new method designed at the Department of Geography (UJEP) and they document some analogical development trends and features of social and ecological burden (stress) and their correlation. It shows higher inertia of ecological subsystem conditioned by persistence of partial components of the subsystem. The ecological subsystem does not respect many changes and shift in social subsystem which is due to the existence of several significant macro-regional anthropogenic influences and impacts which exceed the boundary of model areas. Thus, an important role is assigned to geographical location of model areas and cross-border political and social effects influencing both human and natural components of the landscape. Next conclusion to be said is the correlation between population density and character of changes in social subsystem, while lower population intensifies the character of these changes