Mn 1 -x å x Se (M = Ti, V, Fe, Co) solid solutions are prepared by solid-state reactions and high-pressure synthesis (7 GPa, 1600 K). All of the solid solutions have a cubic (NaCl) structure, and their lattice parameter decreases with increasing solute concentration. The magnetic susceptibility of the solid solutions is measured from 77 to 900 K by the Faraday method. Below 130-150 K, the solid solutions undergo antiferromagnetic ordering.
The kinetics and mechanism of catalyzed copper deposition via hydrogen reduction of copper(II) dipivaloylmethanate are studied between 200 and 350 ° C. A multistep mechanism is proposed which involves the formation of a polychelate on the surface of the growing Cu film. Film growth is accompanied by the transfer of the organic ligand of the polychelate to the adsorbed products of Cu(dpm) 2 dissociation. The low activation energy of the process is interpreted in terms of formal kinetics. The introduction of H(dpm) further reduces the activation energy of the process, to 10 ± 5 kJ/mol, owing to the dissociative adsorption of the diketone.
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